Prestressed laminated slab sandwich shear wall optimization design method based on parameterized model

Abstract

The invention relates to the technical field of building structure engineering and construction, and particularly discloses a prestressing laminated slab sandwich shear wall optimization design method based on a parameterized model, which comprises the following steps: calculating key parameters such as prestressing loss, stress distribution deviation value, environment temperature variation and shear wall displacement so as to comprehensively evaluate the performance of a shear wall; and the good operation state of the equipment is ensured by monitoring the deviation between the actual tensioning force of the prestress applying equipment and the target tensioning force, the abrasion degree of the tensioning clamp and the correctness of the tensioning sequence, and the correlation between the working efficiency of the prestress applying equipment and the performance of the shear wall in the monitoring period is analyzed; by means of the method, possible problems of the shear wall can be found in the early stage, measures can be taken in time for correction, it is ensured that each project meets the high-standard quality requirement, a scientific basis is provided for equipment maintenance, and technical innovation and development of the whole industry are promoted.

Description

Technical Field

[0001] The invention relates to the field of building structure engineering and construction technology, and in particular to a prestressed composite plate sandwich shear wall optimization design method based on a parameterized model. Background Art

[0002] As an efficient building structure system, prestressed composite slab sandwich shear wall is widely used in modern high-rise and super-high-rise buildings, especially in resisting seismic loads. However, in order to ensure the performance and safety of the structural system, the prestressed state of the shear wall needs to be accurately controlled. Traditional prestressed control methods often rely on manual experience, which may lead to problems such as the inability to accurately quantify prestress loss, inaccurate performance evaluation of shear walls, and insufficient status monitoring of prestressing equipment. Therefore, there is an urgent need for a method that can accurately measure prestress loss, evaluate shear wall performance, and monitor the status of prestressing equipment to improve the overall performance and safety of prestressed composite slab sandwich shear walls.

[0003] The existing performance evaluation methods of prestressed composite slab sandwich shear walls have certain limitations, which are mainly reflected in the following aspects. First, with regard to the measurement of prestress loss, the currently commonly used measurement technology has limited accuracy and it is difficult to accurately capture the true stress changes of prestressed tendons under actual working conditions. Since the calculation of prestress loss is not accurate enough, it directly affects the safety and durability assessment of the overall structure of the shear wall. The accurate calculation of prestress loss is crucial to ensure structural performance. However, the existing measurement methods cannot provide sufficiently accurate data support, making the assessment of prestress loss a difficult problem. Secondly, in terms of shear wall performance evaluation, the existing evaluation system usually only focuses on the single indicator of concrete strength, and fails to fully consider factors such as prestress loss, ambient temperature changes, shear wall displacement, etc. that have an important impact on structural performance. This one-sided evaluation method leads to limitations in the evaluation results and cannot fully reflect the actual performance of the shear wall, limiting its application value in engineering practice. In addition, in terms of status monitoring of prestressing equipment, there is currently a lack of effective monitoring means and technologies, and it is impossible to grasp the working status of the equipment in real time. When the prestressing equipment fails or is abnormal, it is often impossible to discover and take corresponding remedial measures in time, which not only increases the potential safety hazards of the structure, but also may lead to construction delays and increased costs. Therefore, improving the status monitoring capability of prestressing equipment is crucial to ensuring the overall performance and safety of the shear wall structure.

[0004] In summary, the existing technology has obvious deficiencies in prestress loss measurement, shear wall performance evaluation and prestressing equipment status monitoring, and urgently needs to be improved and perfected.

[0005] In order to solve the above problems, the present invention proposes a novel performance evaluation method for prestressed composite slab sandwich shear walls. The method evaluates the prestress loss and, at the same time, comprehensively considers multiple factors, including but not limited to concrete strength, prestress loss, ambient temperature changes, etc., to achieve a more comprehensive shear wall performance evaluation. In addition, the present invention can monitor the working status of the equipment in real time and respond when the equipment has an abnormality, thereby effectively improving the overall performance and safety of the shear wall structure. These improvement measures are aimed at improving the evaluation accuracy and reliability of prestressed composite slab sandwich shear walls to meet the needs of modern construction projects. Summary of the invention

[0006] The purpose of the present invention is to provide an optimization design method for prestressed composite slab sandwich shear walls based on a parametric model, aiming to solve the problems existing in the prior art. The specific steps are as follows: First, the prestress loss is calculated by comparing the difference in stress values ​​before and after the prestressed tendons are tensioned; then, the geometric parameters such as the height and thickness of the shear wall and the material properties of the concrete such as the elastic modulus, Poisson's ratio, compressive strength and tensile strength are collected; these parameters are used to perform finite element analysis to obtain the stress distribution deviation value inside the concrete; at the same time, the ambient temperature changes before and after the prestressed tendons are tensioned are recorded, and the displacement of the shear wall under different working conditions is monitored; finally, the comprehensive score of the shear wall performance is obtained through weighted calculation based on factors such as the prestress loss, the concrete stress distribution deviation value, the shear wall displacement and the ambient temperature change, and the score is compared with the set threshold to determine whether the performance of the shear wall is normal. Secondly, the cause of the abnormal shear wall performance is further analyzed. The factors, especially the status of the prestressing device, including the deviation between the actual tensioning force and the target tensioning force, the degree of wear of the tensioning clamps, and the correctness of the tensioning sequence, etc., and the abnormal score of the prestressing device is calculated based on the above analysis results to determine whether the equipment has an abnormality. Then, the correlation between the working efficiency of the prestressing device and the comprehensive score of the shear wall performance during the monitoring period is evaluated by statistical analysis. Finally, if there is a strong correlation between the prestressing device and the shear wall performance, the target prestress and prestress transfer efficiency of the shear wall are determined by finite element analysis, and the tensioning force of the prestressing device is adjusted accordingly until the expected effect is achieved. Through this series of steps, the present invention can effectively improve the performance and safety of the prestressed composite slab sandwich shear wall.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] The optimization design method of prestressed composite slab sandwich shear wall based on parametric model includes the following steps:

[0009] Obtain the stress values ​​before and after the prestressed tendons are tensioned to obtain the prestress loss;

[0010] Obtain the geometric parameters of the shear wall and the material properties of the concrete, and obtain the stress distribution deviation value inside the concrete through finite element analysis;

[0011] Obtain the change of ambient temperature before and after the prestressed tendons are tensioned, and obtain the change of ambient temperature;

[0012] Get the displacement of the shear wall;

[0013] The prestress loss, stress distribution deviation, ambient temperature change and shear wall displacement are processed to obtain a comprehensive score of shear wall performance and generate unqualified and qualified signals of shear wall performance;

[0014] Based on the unqualified shear wall performance signal, the cause of the abnormal shear wall performance is further analyzed to obtain the abnormality of the prestressing equipment, and the abnormal and normal signals of the prestressing equipment are generated;

[0015] Based on the abnormal signals of prestressing equipment, statistical analysis is performed on the working efficiency of prestressing equipment and the comprehensive score of shear wall performance to evaluate the correlation between the two and generate correlation influence signals and non-correlation influence signals;

[0016] Based on the correlation influence signal, the target prestress and prestress transfer efficiency of the shear wall are determined by finite element analysis, and the tensioning force of the prestressing equipment is adjusted accordingly.

[0017] As a further solution of the present invention: the calculation process of the prestress loss and the ambient temperature change is:

[0018] The stress value before the prestressed tendon is tensioned is calculated by difference with the stress value after the prestressed tendon is tensioned to obtain the prestress loss of the prestressed tendon;

[0019] Monitor the ambient temperature before and after the prestressed tendons are tensioned, calculate the difference between the ambient temperature before and after tensioning, and obtain the change in the ambient temperature of the prestressed tendons.

[0020] As a further solution of the present invention: the geometric parameters of the shear wall include the height and thickness of the shear wall;

[0021] The material properties of concrete include the elastic modulus, Poisson's ratio, compressive strength, and tensile strength of concrete.

[0022] As a further solution of the present invention: the calculation process of the comprehensive score of shear wall performance is:

[0023] The comprehensive score ZHF of shear wall performance is calculated;

[0024] As a further solution of the present invention: comparing the shear wall performance comprehensive score with a comprehensive score threshold;

[0025] If the comprehensive score of the shear wall performance is less than or equal to the comprehensive score threshold, it means that the shear wall performance is abnormal, and a shear wall performance failure signal is generated;

[0026] If the comprehensive score of the shear wall performance is greater than the comprehensive score threshold, it means that the shear wall performance is normal, and a qualified shear wall performance signal is generated.

[0027] As a further solution of the present invention: the process of obtaining the abnormal score of the prestressing device is:

[0028] Obtain the actual tension force of the prestressing device;

[0029] The difference between the actual tension force and the target tension force is calculated to obtain the tension force deviation value;

[0030] The absolute value of the tension deviation value is calculated by ratio with the target tension to obtain the tension deviation ratio ZLL;

[0031] Obtaining the actual weight of the tensioning fixture in the prestressing device;

[0032] The actual weight of the tensioning fixture is calculated by difference with the weight of a new tensioning fixture that has not been used, so as to obtain the deviation value of the tensioning fixture weight;

[0033] The absolute value of the deviation value of the tensioning fixture weight is calculated by ratio with the weight of the new tensioning fixture to obtain the wear ratio MSB of the tensioning fixture in the prestressing device;

[0034] Obtain the actual tensioning sequence of prestressed tendons;

[0035] If the actual tensioning sequence of the prestressed tendons is inconsistent with the tensioning sequence in the design, the tensioning sequence ZLS is recorded as 1;

[0036] If the actual tensioning sequence of the prestressed tendons is consistent with the tensioning sequence in the design, ZLS is recorded as 0;

[0037] The abnormal score SBF of the prestressing equipment is calculated.

[0038] As a further solution of the present invention: comparing the prestressing device abnormality score with the prestressing device abnormality score threshold;

[0039] If the prestressing device abnormality score is greater than the prestressing device abnormality score threshold, it means that the prestressing device has an abnormality, and a prestressing device abnormality signal is generated;

[0040] If the prestressing device abnormality score is less than or equal to the prestressing device abnormality score threshold, it means that the prestressing device has no abnormality, and a prestressing device normal signal is generated.

[0041] As a further solution of the present invention: the process of obtaining the working efficiency of the prestressing device is as follows:

[0042] In one monitoring cycle, the actual tension force of the prestressing device is obtained when it is working;

[0043] The difference between the actual tension force and the theoretical optimal tension force is calculated to obtain the tension force deviation ratio LLC;

[0044] The time required to complete one tensioning operation when the prestressing device is working is obtained, which is recorded as the tensioning speed ZLS;

[0045] Obtain the number of failures of the prestressing device within the monitoring period, calculate the ratio of the number of failures to the total operating time of the prestressing device within the monitoring period, and obtain the failure rate GZL of the prestressing device within the monitoring period;

[0046] The working efficiency XL of the prestressing equipment within one monitoring cycle is calculated.

[0047] As a further solution of the present invention: based on the working efficiency of the prestressing device, the process of statistically analyzing the working efficiency of the prestressing device and the comprehensive score of the shear wall performance is as follows:

[0048] Obtain the comprehensive score of shear wall performance during the monitoring period;

[0049] Integrate the working efficiency of prestressing equipment or the comprehensive scores of shear wall performance in multiple monitoring cycles to obtain working efficiency groups or comprehensive score groups;

[0050] Sort the work efficiency in the work efficiency group or the comprehensive score in the comprehensive score group from low to high to obtain a work efficiency sequence or a comprehensive score sequence;

[0051] The first work efficiency or comprehensive score in the work efficiency sequence or comprehensive score sequence is assigned a grade value of 1, the second work efficiency or comprehensive score in the work efficiency sequence or comprehensive score sequence is assigned a grade value of 2, and so on, all work efficiencies or comprehensive scores in the work efficiency sequence or comprehensive score sequence are assigned a work efficiency grade value x XL Or the comprehensive score level value y ZHF ;

[0052] Set the work efficiency level value x XL The corresponding comprehensive score level value y ZHF Processing is performed to obtain the work efficiency level value and the corresponding comprehensive score level value level value data pair (x XL ,y ZHF );

[0053] The difference between the work efficiency grade value and the corresponding comprehensive score grade value in each grade value data pair is calculated to obtain the grade difference d of the grade value data pair. i ;

[0054] The difference d between the ranks of the rank value pairs i , the relationship coefficient rs between the prestressing equipment and the shear wall performance is calculated;

[0055] If the absolute value of the relationship coefficient rs between the prestressing device and the shear wall performance is greater than or equal to the relationship coefficient threshold, a correlation influence signal is generated;

[0056] If the absolute value of the relationship coefficient rs between the prestressing device and the shear wall performance is less than the relationship coefficient threshold, a non-correlation influence signal is generated.

[0057] As a further solution of the present invention: based on the correlation influence signal, the process of adjusting the tensioning force of the prestressing device is as follows:

[0058] The prestressed composite slab sandwich shear wall is structurally analyzed by finite element analysis to obtain the target prestress Yyl and prestress transfer efficiency η of the shear wall.

[0059] Get the cross-sectional area Aps of the prestressed tendons used in the shear wall;

[0060] The target prestress of the shear wall is calculated by multiplying the cross-sectional area of ​​the prestressed tendons to obtain the theoretical tension force;

[0061] The ratio of theoretical tension force to prestress transfer efficiency is calculated to obtain the actual target tension force;

[0062] Obtain the real-time tension force of the current prestressing device;

[0063] The difference between the actual target tension force and the actual tension force is calculated to obtain the total tension force adjustment;

[0064] Calculate the ratio of the total tension force adjustment amount to the preset adjustment times to obtain the tension force control amount for each adjustment;

[0065] Based on the tensioning force control amount adjusted each time, the prestressing device is adjusted;

[0066] After the adjustment, the shear wall performance is continuously monitored to obtain a new comprehensive shear wall performance score;

[0067] The comprehensive performance score of the new shear wall is analyzed. If it is abnormal, the total adjustment of the tensioning force is repeatedly calculated and the prestressing equipment is repeatedly adjusted.

[0068] Beneficial effects of the present invention:

[0069] (1) The method provided by the present invention can accurately evaluate the performance of shear walls and effectively identify potential problems of prestressing equipment. By calculating the prestress loss, stress distribution deviation, ambient temperature change and shear wall displacement, the performance of the shear wall during the construction process can be fully understood. This method can not only help engineers discover possible problems with the shear wall at an early stage, but also take timely measures to correct them, thereby avoiding safety hazards caused by poor shear wall performance. For example, in practical applications, through a comprehensive evaluation of the shear wall performance, stress concentration phenomena in certain areas or performance degradation caused by the inconsistency between the concrete material properties and the design requirements can be quickly located. This helps engineers optimize the design of the shear wall and select more appropriate material ratios and size specifications, thereby improving the safety and durability of the entire building structure. In addition, this method can also be used as an important quality control method to guide the quality management of the construction site and ensure that each project meets high quality standards.

[0070] (2) The present invention also pays special attention to the status monitoring of the prestressing equipment, which is crucial to ensuring the performance of the shear wall. By analyzing the deviation between the actual tensioning force of the equipment and the target tensioning force, the degree of wear of the tensioning clamps, and the correctness of the tensioning sequence, the loss of prestress due to equipment failure can be effectively prevented, and the structural safety of the shear wall can be further ensured. For example, in the actual construction process, if the tensioning clamps are found to be severely worn, it may be necessary to replace new clamps to ensure the accurate transmission of the tensioning force. This timely maintenance can not only reduce the fluctuation of the shear wall performance, but also extend the service life of the prestressing equipment and reduce the subsequent maintenance costs. In addition, by calculating the abnormal score of the prestressing equipment, the operating status of the equipment can be quantitatively evaluated, providing a scientific basis for equipment maintenance. On the one hand, this helps construction units to better plan equipment maintenance plans, and on the other hand, it also provides equipment manufacturers with opportunities to improve their products, promoting technological innovation and development in the entire industry.

[0071] (3) More importantly, the present invention also introduces a method for evaluating the correlation between the working efficiency of the prestressing device and the performance of the shear wall, which is of great significance for improving construction efficiency and reducing costs. By statistically analyzing the working efficiency of the prestressing device and the comprehensive score of the shear wall performance during the monitoring period, the degree of influence of the equipment performance on the final performance of the shear wall can be clarified. For example, if it is found that the working efficiency of the prestressing device is low and the shear wall performance is poor, a more reasonable tension setting can be determined by finite element analysis to improve the target prestress and prestress transfer efficiency of the shear wall. This method based on data analysis can help the construction unit to formulate a more reasonable construction plan in the early stage of construction, avoiding the additional costs caused by the shear wall performance problems in the later stage. In addition, this method can also promote the cooperation between the construction unit and the equipment supplier to jointly explore how to improve the equipment performance to meet the higher standard of construction needs. In short, the present invention provides an efficient and practical technical solution, which can not only significantly improve the performance of the shear wall, but also promote the construction industry to develop in a more scientific and refined direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] The present invention will be further described below in conjunction with the accompanying drawings.

[0073] Figure 1 It is a flow chart of the optimization design method of the prestressed composite plate sandwich shear wall based on the parametric model of the present invention;

[0074] Figure 2 is a flow chart for obtaining a comprehensive score of shear wall performance in the present invention;

[0075] Figure 3 It is a flow chart of obtaining abnormal points of the prestressing device in the present invention;

[0076] Figure 4 A three-dimensional diagram of a prestressed thin plate of the present invention;

[0077] Figure 5 A three-dimensional diagram of a truss steel bar of the present invention;

[0078] Figure 6 It is an overall stereogram of the truss steel bar and the prestressed thin plate of the present invention;

[0079] Figure 7 It is a three-dimensional diagram of the truss steel bar and the prestressed thin plate after casting of the present invention;

[0080] Figure 8 This is an overall three-dimensional diagram of the prestressed composite plate sandwich shear wall of the present invention;

[0081] Fig. 9 A connection method of the prestressed composite plate sandwich shear wall of the present invention;

[0082] Fig.10 A connection method of the prestressed composite plate sandwich shear wall of the present invention;

[0083] Fig.11 This is a connection method for the prestressed composite plate sandwich shear wall of the present invention. DETAILED DESCRIPTION

[0084] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0085] The parametric model-based prestressed composite slab sandwich shear wall optimization design method of the present invention is based on a hollow shear wall. The hollow shear wall is made as follows: Figure 4 As shown, thin plates with truss steel bars are produced on a mature prestressed composite slab long production line. The prestressed bars are first tensioned, ordinary steel bars and truss steel bars are arranged, and finally concrete pouring and curing are carried out. Another prestressed thin plate is produced on another production line. After the concrete is poured and is in the initial setting stage, the prefabricated thin plate with truss steel bars that has been made in advance is flipped into the concrete. After it is cured, a hollow shear wall is finally formed.

[0086] Specific:

[0087] like Figure 4-Figure 8 As shown, the shear wall comprises two prestressed thin plates 1, which are connected to each other by truss steel bars to form a sandwich prefabricated shear wall, and the upper part and left and right sides thereof have exposed reinforcing bars, which are integrally formed with adjacent components by local casting;

[0088] Prestressed thin plate 1 is produced on a mature prestressed composite plate long-line pedestal. First, the prestressed steel bars are tensioned, ordinary steel bars are arranged, and the prepared truss steel bars are placed. The truss steel bars are placed on the prestressed steel bars, and concrete is poured for maintenance and tensioning. The prestressed steel bars are exposed at both ends of the plate, and the ordinary steel bars are exposed at one end and not at the other. The length of the ordinary steel bars at the upper end of the truss steel bars is consistent with that of the ordinary steel bars in the vertical direction.

[0089] Prestressed thin plate 2 is produced on another production line, first tensioning the prestressed steel bars, arranging the ordinary steel bars, and then pouring;

[0090] After the prestressed sheet 1 and the truss steel bar are cast as a whole, they are turned over in mid-air by a crane, and the height is adjusted so that they are embedded in the newly cast prestressed sheet 2, and the prestressed bars of the prestressed sheet 2 are released for maintenance. After reaching a certain strength, they can be hoisted and transported;

[0091] In the preparation process of the above-mentioned shear wall, concrete strength, prestress loss, ambient temperature changes, etc. should also be considered to achieve a more comprehensive shear wall performance evaluation. Based on this, the present invention proposes a more optimized method for the optimization design method of prestressed composite slab sandwich shear wall based on a parametric model, as described below.

[0092] Example 1

[0093] See also Figure 1 As shown, the present invention is a prestressed composite slab sandwich shear wall optimization design method based on a parameterized model, comprising the following steps:

[0094] By comparing the difference in stress values ​​before and after the prestressed tendons are tensioned, the prestress loss is obtained;

[0095] Get the geometric parameters of the shear wall and the material properties of the concrete;

[0096] Among them, the geometric parameters of the shear wall include the height and thickness of the shear wall, and the material properties of the concrete include the elastic modulus, Poisson's ratio, compressive strength and tensile strength of the concrete;

[0097] Finite element analysis is performed on the geometric parameters of the shear wall and the material properties of the concrete to obtain the stress distribution deviation value inside the concrete;

[0098] Obtain the change of ambient temperature before and after the prestressed tendons are tensioned, and obtain the change of ambient temperature;

[0099] Get the displacement of the shear wall;

[0100] Based on the above prestress loss, stress distribution deviation, ambient temperature change and shear wall displacement, the comprehensive score of shear wall performance is obtained through weighted calculation;

[0101] Compare the shear wall performance comprehensive score with the set threshold to generate unqualified and qualified signals of the shear wall performance;

[0102] Based on the signal of unqualified shear wall performance, further analyze the reasons for abnormal shear wall performance, especially the status of prestressing equipment;

[0103] Among them, the status of the prestressing equipment includes the deviation between the actual tensioning force and the target tensioning force, the wear degree of the tensioning fixture and the correctness of the tensioning sequence;

[0104] Based on the above analysis structure, the abnormal score of the prestressing device is calculated, and then the abnormal and normal signals of the prestressing device are generated;

[0105] Based on the abnormal signals of prestressing equipment, the correlation between the working efficiency of prestressing equipment and the comprehensive score of shear wall performance during the monitoring period is evaluated through statistical analysis, and correlation influence signals and non-correlation influence signals are generated;

[0106] Based on the correlation influence signal, the target prestress and prestress transfer efficiency of the shear wall are determined through finite element analysis, and the tensioning force of the prestressing equipment is adjusted accordingly until the expected effect is achieved.

[0107] Example 2

[0108] Obtain the stress value before and after the prestressed tendons are tensioned;

[0109] The stress value before the prestressed tendon is tensioned is calculated by difference with the stress value after the prestressed tendon is tensioned to obtain the prestress loss of the prestressed tendon;

[0110] It should be noted that prestressed tendons are special steel or steel strands used in prestressed concrete structures. They are pre-applied with compressive stress in the construction of the structure to provide the structure with bearing capacity and crack resistance. The application of prestressed tendons can significantly enhance the performance of concrete structures, especially in terms of bearing tensile stress. In prestressed composite slab sandwich shear walls, prestressed tendons are mainly used to improve the overall stability and shear resistance of the shear wall. By arranging prestressed tendons in the shear wall and applying prestress, the deformation of the shear wall under earthquake action can be effectively reduced and its seismic performance can be improved. The stress value of the prestressed tendons can be directly measured by using stress sensors or strain gauges installed on the prestressed tendons.

[0111] Get the geometric dimensions of the shear wall;

[0112] The geometric dimensions include the height and thickness of the shear wall.

[0113] Get the material properties of concrete;

[0114] Among them, material properties include elastic modulus, Poisson’s ratio, compressive strength, and tensile strength of concrete;

[0115] Based on the geometric dimensions of the shear wall and the material properties of concrete, a finite element analysis is performed on the concrete to obtain the stress distribution deviation value inside the concrete;

[0116] It should be noted that obtaining the stress distribution inside concrete is crucial for the design, construction and maintenance of prestressed composite slab sandwich shear walls. Understanding the stress distribution inside concrete helps ensure the safety and stability of the structure and prevent local damage and overall instability. By monitoring the stress distribution, the use of materials and structural design can be optimized, the material utilization rate can be improved, and the structural performance can be optimized. During the construction process, monitoring the stress distribution inside concrete helps to discover and correct potential quality problems, such as uneven pouring or insufficient vibration. In addition, long-term monitoring of changes in stress distribution helps to evaluate the durability of the structure and provide a basis for maintenance decisions, ensuring that the structure maintains good performance throughout its life cycle.

[0117] Monitor the ambient temperature before and after the prestressed tendons are tensioned, calculate the difference between the ambient temperature before and after tensioning, and obtain the change in the ambient temperature of the prestressed tendons;

[0118] Get the shear wall displacement;

[0119] By formula The comprehensive score ZHF of shear wall performance is calculated;

[0120] Wherein, P is the prestress loss, C is the concrete stress distribution deviation, D is the shear wall displacement, T is the ambient temperature change, w1, w2, w3 and w4 are the weight coefficients of the prestress loss P, concrete stress distribution C, shear wall displacement D and ambient temperature change T respectively, and w1+w2+w3+w4=1;

[0121] The shear wall performance composite score is compared to the composite score threshold;

[0122] If the comprehensive score of the shear wall performance is less than or equal to the comprehensive score threshold, it means that the shear wall performance is abnormal, and a shear wall performance failure signal is generated;

[0123] If the comprehensive score of the shear wall performance is greater than the comprehensive score threshold, it means that the shear wall performance is normal, and a qualified shear wall performance signal is generated.

[0124] Example 3

[0125] Based on the above-mentioned unqualified shear wall performance signal, since the abnormal state of the prestressing device will cause the shear wall performance to be unqualified, it is analyzed and judged whether the unqualified shear wall performance is related to the abnormality of the prestressing device. If there is an influence relationship of the prestressing device, it is convenient to adjust the prestressing device in time during the subsequent construction process to reduce the influence of the prestressing device on the performance of the prestressed composite plate sandwich shear wall, effectively stabilize the shear wall performance, and thus improve the safety of the prestressed composite plate sandwich shear wall. Specifically:

[0126] Obtain the actual tension force of the prestressing device;

[0127] The difference between the actual tension force and the target tension force is calculated to obtain the tension force deviation value;

[0128] The absolute value of the tension deviation value is calculated by ratio with the target tension to obtain the tension deviation ratio ZLL;

[0129] Obtaining the actual weight of the tensioning fixture in the prestressing device;

[0130] The actual weight of the tensioning fixture is calculated by difference with the weight of a new tensioning fixture that has not been used, so as to obtain the deviation value of the tensioning fixture weight;

[0131] The absolute value of the deviation value of the tensioning fixture weight is calculated by ratio with the weight of the new tensioning fixture to obtain the wear ratio MSB of the tensioning fixture in the prestressing device;

[0132] Obtain the actual tensioning sequence of prestressed tendons;

[0133] If the actual tensioning sequence of the prestressed tendons is inconsistent with the tensioning sequence in the design, the tensioning sequence ZLS is recorded as 1;

[0134] If the actual tensioning sequence of the prestressed tendons is consistent with the tensioning sequence in the design, ZLS is recorded as 0;

[0135] The abnormal score SBF of the prestressing equipment is calculated by the formula SBF = k1×ZLL+k2×MSB+k3×ZLS;

[0136] Among them, k1, k2 and k3 are the preset weight coefficients of the tensioning force deviation ratio ZLL, the wear ratio of the tensioning fixture MSB and the tensioning sequence ZLS respectively;

[0137] comparing the prestressing device abnormal score with a prestressing device abnormal score threshold;

[0138] If the prestressing device abnormality score is greater than the prestressing device abnormality score threshold, it means that the prestressing device has an abnormality, and a prestressing device abnormality signal is generated;

[0139] If the prestressing device abnormality score is less than or equal to the prestressing device abnormality score threshold, it means that the prestressing device has no abnormality, and a prestressing device normal signal is generated.

[0140] Example 4

[0141] Based on the above-mentioned unqualified shear wall performance signals and abnormal prestressing equipment signals, the relationship between shear wall performance and prestressing equipment status is analyzed, specifically:

[0142] In a specific embodiment:

[0143] In one monitoring cycle, the actual tension force of the prestressing device is obtained when it is working;

[0144] The difference between the actual tension force and the theoretical optimal tension force is calculated to obtain the tension force deviation ratio LLC;

[0145] The time required to complete one tensioning operation when the prestressing device is working is obtained, which is recorded as the tensioning speed ZLS;

[0146] Obtain the number of failures of the prestressing device within the monitoring period, calculate the ratio of the number of failures to the total operating time of the prestressing device within the monitoring period, and obtain the failure rate GZL of the prestressing device within the monitoring period;

[0147] By formula The working efficiency XL of the prestressing equipment within one monitoring cycle is calculated;

[0148] Obtain the comprehensive score of shear wall performance during the monitoring period;

[0149] Integrate the working efficiency of prestressing equipment in multiple monitoring cycles to obtain a working efficiency group;

[0150] Sort the work efficiency in the work efficiency group from low to high to obtain a work efficiency sequence;

[0151] Assign a grade value of 1 to the first work efficiency in the work efficiency sequence, assign a grade value of 2 to the second work efficiency in the work efficiency sequence, and so on, assign a grade value x to all work efficiencies in the work efficiency sequence XL ;

[0152] Integrate the comprehensive scores of shear wall performance in multiple monitoring cycles to obtain a comprehensive score group;

[0153] Sort the comprehensive scores in the comprehensive score group from low to high to obtain a comprehensive score sequence;

[0154] The first comprehensive score in the comprehensive score sequence is assigned a grade value of 1, the second comprehensive score in the comprehensive score sequence is assigned a grade value of 2, and so on, all comprehensive scores in the comprehensive score sequence are assigned a grade value y ZHF ;

[0155] Processing the work efficiency sequence and the comprehensive score sequence, making one-to-one correspondence between each work efficiency value and the corresponding comprehensive score, and obtaining multiple data pairs (XL, ZHF);

[0156] Based on the data pair (XL, ZHF), the work efficiency level value xXL and the comprehensive score y ZHF Substitute the data pair to obtain the work efficiency grade value and the corresponding comprehensive score grade value (x XL ,y ZHF );

[0157] Based on the level value data pair (x XL ,y ZHF ), calculate the difference between the work efficiency grade value and the corresponding comprehensive score grade value in each grade value data pair, and obtain the grade difference d of the grade value data pair i ;

[0158] The difference d between the ranks of the rank value pairs i , through the formula The relationship coefficient rs between the prestressing equipment and the shear wall performance is calculated;

[0159] Where i is the number of monitoring cycles, n is the number of monitoring cycles, i = 1, 2, ..., n;

[0160] If the absolute value of the relationship coefficient rs between the prestressing device and the shear wall performance is greater than or equal to the relationship coefficient threshold, it means that there is a strong correlation between the prestressing device and the shear wall performance, and a correlation influence signal is generated;

[0161] If the absolute value of the relationship coefficient rs between the prestressing device and the shear wall performance is less than the relationship coefficient threshold, it means that there is no strong correlation between the prestressing device and the shear wall performance, and a non-correlation influence signal is generated.

[0162] Example 5

[0163] Based on the above correlation influence signal, the prestressing equipment is regulated, specifically:

[0164] The prestressed composite slab sandwich shear wall is structurally analyzed by finite element analysis to obtain the target prestress Yyl and prestress transfer efficiency η of the shear wall.

[0165] Get the cross-sectional area Aps of the prestressed tendons used in the shear wall;

[0166] The target prestress of the shear wall is calculated by multiplying the cross-sectional area of ​​the prestressed tendons to obtain the theoretical tension force;

[0167] The ratio of theoretical tension force to prestress transfer efficiency is calculated to obtain the actual target tension force;

[0168] Obtain the real-time tension force of the current prestressing device;

[0169] The difference between the actual target tension force and the actual tension force is calculated to obtain the total tension force adjustment;

[0170] Calculate the ratio of the total tension force adjustment amount to the preset adjustment times to obtain the tension force control amount for each adjustment;

[0171] Based on the tensioning force control amount adjusted each time, the prestressing device is adjusted;

[0172] After the adjustment, the shear wall performance is continuously monitored to obtain a new comprehensive shear wall performance score;

[0173] If the new shear wall performance comprehensive score is still abnormal, the total tension adjustment amount is calculated repeatedly and the prestressing equipment is adjusted until the target tension is reached.

[0174] Working principle of the present invention: The purpose of the present invention is to provide an optimization design method for prestressed composite slab sandwich shear walls based on a parametric model, aiming to solve the problems existing in the prior art. The specific steps are as follows: First, the prestress loss is calculated by comparing the difference in stress values ​​before and after the prestressed tendons are tensioned; then, the geometric parameters such as the height and thickness of the shear wall and the material properties such as the elastic modulus, Poisson's ratio, compressive strength and tensile strength of the concrete are collected; these parameters are used to perform finite element analysis to obtain the stress distribution deviation value inside the concrete; at the same time, the changes in ambient temperature before and after the prestressed tendons are tensioned are recorded, and the displacement of the shear wall under different working conditions is monitored; finally, the comprehensive score of the shear wall performance is obtained through weighted calculation based on factors such as the prestress loss, the concrete stress distribution deviation value, the shear wall displacement and the ambient temperature change, and compared with the set threshold value to determine whether the performance of the shear wall is normal. Secondly, the cause of the abnormal shear wall performance is further analyzed. The factors, especially the status of the prestressing device, including the deviation between the actual tensioning force and the target tensioning force, the degree of wear of the tensioning clamps, and the correctness of the tensioning sequence, etc., and the abnormal score of the prestressing device is calculated based on the above analysis results to determine whether the equipment has an abnormality. Then, the correlation between the working efficiency of the prestressing device and the comprehensive score of the shear wall performance during the monitoring period is evaluated by statistical analysis. Finally, if there is a strong correlation between the prestressing device and the shear wall performance, the target prestress and prestress transfer efficiency of the shear wall are determined by finite element analysis, and the tensioning force of the prestressing device is adjusted accordingly until the expected effect is achieved. Through this series of steps, the present invention can effectively improve the performance and safety of the prestressed composite slab sandwich shear wall.

[0175] Based on the above shear walls, the connection between the upper and lower shear walls can be conveniently formed as a whole by using local cast-in-place concrete through the following schemes. Specifically:

[0176] like Fig. 9As shown: a temporary formwork attached to the bottom of the sandwich shear wall is used to connect the upper and lower layers by pouring concrete. The temporary formwork is reliably connected to the sandwich shear wall by bolts before the shear wall leaves the factory. The height of the temporary formwork is L (L has different insertion depths depending on the seismic level). It supports the prefabricated sandwich shear wall and the local formwork at the shear wall hoisting site. The vertical reinforcement of the upper and lower prefabricated shear walls is reliably anchored by the local cast-in-place of the shear wall. The concrete inside the sandwich wall is poured. The temporary formwork can be removed after it is fully hardened and can be reused after returning to the factory.

[0177] like Fig.10 As shown, this method does not require formwork support. The ordinary steel bars exposed in the vertical direction of the lower shear wall are slightly bent and inserted into the gap in the middle of the upper shear wall to a certain depth L (the insertion depth varies depending on the seismic resistance level, generally not less than 300mm), and finally the concrete inside the sandwich is poured.

[0178] like Fig.11 As shown: This method does not require supporting formwork, and uses additional steel mesh to connect the upper and lower layers. The configuration amount of the steel mesh is determined according to the following principles: the vertical steel bars per unit width shall not be less than the total amount of vertical steel bars on both sides of the hollow shear wall, and the horizontal steel bars are replaced with equal strength to the sum of the prestressed horizontal steel bars on both sides of the hollow shear wall. The length of the steel mesh extending into the cavity of the upper and lower shear walls (L) varies according to the seismic resistance level and the insertion depth is generally 300mm-500mm) needs to be connected along the prestressed thin plate wall, and finally poured to form a whole.

[0179] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. The optimization design method of prestressed composite slab sandwich shear wall based on parametric model is characterized by: The following steps are involved: Obtain the stress values ​​before and after the prestressed tendons are tensioned to obtain the prestress loss; Obtain the geometric parameters of the shear wall and the material properties of the concrete, and obtain the stress distribution deviation value inside the concrete through finite element analysis; Obtain the change of ambient temperature before and after the prestressed tendons are tensioned, and obtain the change of ambient temperature; Get the displacement of the shear wall; The prestress loss, stress distribution deviation, ambient temperature change and shear wall displacement are processed to obtain a comprehensive score of shear wall performance and generate unqualified and qualified signals of shear wall performance; Based on the unqualified shear wall performance signal, the cause of the abnormal shear wall performance is further analyzed to obtain the abnormality of the prestressing equipment, and the abnormal and normal signals of the prestressing equipment are generated; Based on the abnormal signals of prestressing equipment, statistical analysis is performed on the working efficiency of prestressing equipment and the comprehensive score of shear wall performance to evaluate the correlation between the two and generate correlation influence signals and non-correlation influence signals; Based on the correlation influence signal, the target prestress and prestress transfer efficiency of the shear wall are determined by finite element analysis, and the tensioning force of the prestressing equipment is adjusted accordingly.

2. The method for optimizing the design of prestressed composite slab sandwich shear walls based on a parametric model according to claim 1, characterized in that: The calculation process of prestress loss and ambient temperature change is: The stress value before the prestressed tendon is tensioned is calculated by difference with the stress value after the prestressed tendon is tensioned to obtain the prestress loss of the prestressed tendon; Monitor the ambient temperature before and after the prestressed tendons are tensioned, calculate the difference between the ambient temperature before and after tensioning, and obtain the change in the ambient temperature of the prestressed tendons.

3. The method for optimizing the design of prestressed composite slab sandwich shear walls based on a parametric model according to claim 2, characterized in that: The geometric parameters of the shear wall include the height and thickness of the shear wall; The material properties of concrete include the elastic modulus, Poisson's ratio, compressive strength, and tensile strength of concrete.

4. The method for optimizing the design of prestressed composite slab sandwich shear walls based on a parametric model according to claim 3 is characterized in that: The shear wall performance composite score is compared to the composite score threshold; If the comprehensive score of the shear wall performance is less than or equal to the comprehensive score threshold, it means that the shear wall performance is abnormal, and a shear wall performance failure signal is generated; If the comprehensive score of the shear wall performance is greater than the comprehensive score threshold, it means that the shear wall performance is normal, and a qualified shear wall performance signal is generated.

5. The method for optimizing the design of prestressed composite slab sandwich shear walls based on a parametric model according to claim 4, characterized in that: The process of obtaining the abnormal score of prestressing equipment is as follows: Obtain the actual tension force of the prestressing device; The difference between the actual tension force and the target tension force is calculated to obtain the tension force deviation value; The absolute value of the tension deviation value is calculated by ratio with the target tension to obtain the tension deviation ratio ZLL; Obtaining the actual weight of the tensioning fixture in the prestressing device; The actual weight of the tensioning fixture is calculated by difference with the weight of a new tensioning fixture that has not been used, so as to obtain the deviation value of the tensioning fixture weight; The absolute value of the deviation value of the tensioning fixture weight is calculated by ratio with the weight of the new tensioning fixture to obtain the wear ratio MSB of the tensioning fixture in the prestressing device; Obtain the actual tensioning sequence of prestressed tendons; If the actual tensioning sequence of the prestressed tendons is inconsistent with the tensioning sequence in the design, the tensioning sequence ZLS is recorded as 1; If the actual tensioning sequence of the prestressed tendons is consistent with the tensioning sequence in the design, ZLS is recorded as 0; The abnormal score SBF of the prestressing equipment is calculated.

6. The method for optimizing the design of prestressed composite slab sandwich shear walls based on a parametric model according to claim 5, characterized in that: comparing the prestressing device abnormal score with a prestressing device abnormal score threshold; If the prestressing device abnormality score is greater than the prestressing device abnormality score threshold, it means that the prestressing device has an abnormality, and a prestressing device abnormality signal is generated; If the prestressing device abnormality score is less than or equal to the prestressing device abnormality score threshold, it means that the prestressing device has no abnormality, and a prestressing device normal signal is generated.

7. The method for optimizing the design of prestressed composite slab sandwich shear walls based on a parametric model according to claim 6, characterized in that: The process of obtaining the working efficiency of the prestressing equipment is as follows: In one monitoring cycle, the actual tension force of the prestressing device is obtained when it is working; The difference between the actual tension force and the theoretical optimal tension force is calculated to obtain the tension force deviation ratio LLC; The time required to complete one tensioning operation when the prestressing device is working is obtained, which is recorded as the tensioning speed ZLS; Obtain the number of failures of the prestressing device within the monitoring period, calculate the ratio of the number of failures to the total operating time of the prestressing device within the monitoring period, and obtain the failure rate GZL of the prestressing device within the monitoring period; The working efficiency XL of the prestressing equipment within one monitoring cycle is calculated.

8. The method for optimizing the design of prestressed composite slab sandwich shear walls based on a parametric model according to claim 7, characterized in that: Based on the working efficiency of the prestressing equipment, the process of statistical analysis of the working efficiency of the prestressing equipment and the comprehensive score of the shear wall performance is as follows: Obtain the comprehensive score of shear wall performance during the monitoring period; Integrate the working efficiency of prestressing equipment or the comprehensive scores of shear wall performance in multiple monitoring cycles to obtain working efficiency groups or comprehensive score groups; Sort the work efficiency in the work efficiency group or the comprehensive score in the comprehensive score group from low to high to obtain a work efficiency sequence or a comprehensive score sequence; The first work efficiency or comprehensive score in the work efficiency sequence or comprehensive score sequence is assigned a grade value of 1, the second work efficiency or comprehensive score in the work efficiency sequence or comprehensive score sequence is assigned a grade value of 2, and so on, all work efficiencies or comprehensive scores in the work efficiency sequence or comprehensive score sequence are assigned a work efficiency grade value x XL Or the comprehensive score value y ZHF ; Set the work efficiency level value x XL The corresponding comprehensive score level value y ZHF Processing is performed to obtain the work efficiency level value and the corresponding comprehensive score level value level value data pair (x XL ,y ZHF ); The difference between the work efficiency grade value and the corresponding comprehensive score grade value in each grade value data pair is calculated to obtain the grade difference d of the grade value data pair. i ; The difference d between the ranks of the rank value pairs i , the relationship coefficient rs between the prestressing equipment and the shear wall performance is calculated; If the absolute value of the relationship coefficient rs between the prestressing device and the shear wall performance is greater than or equal to the relationship coefficient threshold, a correlation influence signal is generated; If the absolute value of the relationship coefficient rs between the prestressing device and the shear wall performance is less than the relationship coefficient threshold, a non-correlation influence signal is generated.

9. The method for optimizing the design of prestressed composite slab sandwich shear walls based on a parametric model according to claim 8, characterized in that: Based on the correlation influence signal, the process of adjusting the tension force of the prestressing device is as follows: The prestressed composite slab sandwich shear wall is structurally analyzed by finite element analysis to obtain the target prestress Yyl and prestress transfer efficiency η of the shear wall. Get the cross-sectional area Aps of the prestressed tendons used in the shear wall; The target prestress of the shear wall is calculated by multiplying the cross-sectional area of ​​the prestressed tendons to obtain the theoretical tension force; The ratio of theoretical tension force to prestress transfer efficiency is calculated to obtain the actual target tension force; Obtain the real-time tension force of the current prestressing device; The difference between the actual target tension force and the actual tension force is calculated to obtain the total tension force adjustment; Calculate the ratio of the total tension force adjustment amount to the preset adjustment times to obtain the tension force control amount for each adjustment; Based on the tensioning force control amount adjusted each time, the prestressing device is adjusted; After the adjustment, the shear wall performance is continuously monitored to obtain a new comprehensive shear wall performance score; The comprehensive performance score of the new shear wall is analyzed. If it is abnormal, the total adjustment of the tensioning force is repeatedly calculated and the prestressing equipment is repeatedly adjusted.

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