A structural analysis and design method using edge zone top-down method

Abstract

The application relates to the technical field of civil engineering, and particularly provides a structural analysis and design method adopting a side area reverse construction method, and solves the problem of how to obtain a specific reinforcement scheme. The application comprises the following steps: dividing a construction area based on preset conditions to obtain a reverse construction side area and a forward construction central area; simplifying a floor unit into a bar unit, applying earth side pressure in the form of uniform load on the bar unit, and analyzing to obtain the stress condition of the bar unit; establishing a two-dimensional model of the floor of the reverse construction side area, adding earth side pressure to the periphery of the two-dimensional model, and obtaining the unit stress and strain of the analysis; establishing a three-dimensional model of the floor of the reverse construction side area, obtaining overall structural performance information and corresponding component reinforcement information; establishing a four-dimensional model considering the combined action of earth and the main structure, and performing full-process construction simulation analysis; and comparing the obtained analysis results, and adjusting the component reinforcement based on the comparison results. The application can obtain a reinforcement scheme meeting the construction requirements.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of civil engineering, and particularly provides a structural analysis and design method using a side area reverse construction method. BACKGROUND

[0002] With the steady improvement of China's economy and the rapid growth of urban population, the demand for urban infrastructure will also increase. In order to make more effective use of the limited land resources in cities, the rapid development of high-rise and super high-rise buildings has become an inevitable trend. At the same time, the development and utilization of underground space have also gradually attracted people's attention, and foundation pit engineering will also increase.

[0003] The existing construction method of foundation pit engineering is mainly divided into the forward construction method and the reverse construction method, but both of them have some problems in the foundation pit engineering: the temporary component in the forward construction method has limited stiffness as the enclosure structure, which easily leads to large deformation of the foundation pit; in the process of dismantling, the enclosure structure may also have internal force and deformation mutation, which increases the construction risk, which has a greater impact on the surrounding foundation pit of the target project, and the abandoned temporary component also does not meet the environmental protection requirements; the traditional reverse construction method solves the problem of the forward construction method to some extent, but it is extremely inconvenient to use the reverse construction method in the high-rise core tube basement area, and the following two methods are generally used at present, one is to use densely arranged concrete-filled square steel pipe columns as the vertical bearing capacity components of the core tube basement area, and to set conversion components on the reference layer to support the shear wall above, however, this method needs to consider the connection problem between the concrete-filled steel pipe columns, which will have a certain impact on the overall performance of the core tube part, the other is to use a diaphragm wall as the vertical bearing capacity component of the core tube basement area, but this method is expensive, and the quality, strength and durability of the construction are difficult to meet the demand of the shear wall, and the large thickness of the wall also affects the building layout.

[0004] In order to solve the problems existing in the traditional forward construction method and the traditional reverse construction method, a modified local reverse construction method-side area reverse construction method emerges as the times require. This method aims to ensure the stability of the core tube structure, while greatly reducing the amount of temporary support, improving the efficiency and construction speed of the earthwork, and the large opening design of the center area also significantly improves the lighting and illumination conditions in the reverse construction process of the side area. However, there is still a lack of specific analysis and design process on how to scientifically divide the scope of the reverse construction side area and the forward construction center area, and how to ensure that the annular floor formed by the reverse construction side area has certain strength and stiffness to ensure the stability of the inside of the foundation pit, and how to get the specific reinforcement scheme to meet the construction demand, which have become urgent problems to be solved. SUMMARY

[0005] The present application aims to solve the above technical problems, i.e., at least one of how to scientifically divide the scope of the top-down side area and the bottom-up center area, how to ensure the strength and rigidity of the ring-shaped floor formed by the top-down side area, and how to obtain a specific reinforcement scheme.

[0006] In a first aspect, the present application provides a structure analysis and design method using a side area top-down method, the structure analysis and design method comprising:

[0007] S1, preliminarily arranging a construction area, dividing the construction area based on preset conditions to obtain an initial top-down side area and a bottom-up center area;

[0008] S2, simplifying a floor unit to a bar element unit for a basement part of the top-down side area, and converting a soil lateral pressure to a uniform load acting on the bar element unit in proportion, and analyzing to obtain a stress condition on the bar element unit;

[0009] S3, establishing a two-dimensional model of a floor of the top-down side area, adding the soil lateral pressure calculated in step S2 to the periphery to obtain unit stress and strain for analysis;

[0010] S4, establishing a three-dimensional model of the floor of the top-down side area, modifying component parameters in a preset manner to obtain overall structural performance information and corresponding component reinforcement information;

[0011] S5, establishing a four-dimensional model considering the interaction of soil and main structure, and performing full-process construction simulation analysis;

[0012] S6, comparing the analysis results obtained in step S5 with the analysis results obtained in step S3 and step S4, and selectively adjusting the component reinforcement information based on the comparison results.

[0013] In some feasible embodiments of the above structure analysis and design method, the preset conditions include a first condition and a second condition; the first condition includes: the basement part of the core tube belongs to the bottom-up center area, and the remaining part belongs to the top-down side area; and the second condition includes: the width of the floor of the top-down side area is greater than or equal to 10m, and is at least greater than or equal to 1 / 6 of the corresponding side length of the bottom-up center area.

[0014] In some feasible embodiments of the above structure analysis and design method, the preset conditions further include:

[0015] the basement of the high-rise tower of the core tube belongs to the bottom-up center area, and if the column position of the high-rise tower is within the scope of the second condition, the column position of the high-rise tower belongs to the top-down side area; and / or

[0016] If the podium basement adopts reinforced concrete columns, the podium basement belongs to the top-down center zone; if the podium basement adopts concrete-filled steel tubular columns or in the case of the second condition, the podium basement belongs to the top-down edge zone.

[0017] In some possible implementation manners of the structural analysis and design method, step S2 comprises:

[0018] If the side length of the floor unit is less than 1 / 5 of the maximum side length of the top-down center zone, the floor unit is not considered when the floor unit is simplified into the bar unit; and / or

[0019] The length of the bar unit is half of the sum of the side length of the corresponding top-down center zone and the side length of the corresponding top-down edge zone.

[0020] In some possible implementation manners of the structural analysis and design method, after obtaining the unit stress and strain analyzed, step S3 further comprises:

[0021] It is judged whether the unit stress is greater than or equal to the design strength of concrete, if yes, the width of the floor slab of the top-down edge zone is increased until the unit stress is less than the design strength of concrete.

[0022] In some possible implementation manners of the structural analysis and design method, the "modifying the component parameters in a preset manner" comprises: comparing the stress results of each floor slab of the three-dimensional model with the analysis results of step S2 and the analysis results of step S3 respectively, and modifying the component parameters according to the comparison results.

[0023] In some possible implementation manners of the structural analysis and design method, after the four-dimensional model considering the interaction of soil and the main structure is established, and the whole-process construction simulation analysis is performed, the structural analysis and design method further comprises:

[0024] The analysis results obtained in step S5 are compared with the analysis results obtained in steps S2 and S3 respectively, and the analysis results obtained in step S2 are used as a guide to find out the unfavorable stress points and optimize the structural design.

[0025] In some possible implementation manners of the structural analysis and design method, the "selectively adjusting the component reinforcement information based on the comparison results" comprises:

[0026] If the floor stress in step S5 is greater than or equal to the corresponding floor stress in step S3, and the absolute value of the difference between the two is less than or equal to 30% of the floor stress in step S3, envelope reinforcement design is performed using the analysis results obtained in steps S4 and S5; or

[0027] If the floor stress in step S5 is less than or equal to the corresponding floor stress in step S3, and the absolute value of the difference between the two is less than or equal to 20% of the floor stress in step S3, then the analysis results obtained in steps S4 and S5 are used for envelope reinforcement design; or

[0028] If the absolute value of the difference between the floor stress in step S5 and the corresponding floor stress in step S4 is less than or equal to 10% of the floor stress in step S4, then the analysis results obtained in steps S4 and S5 are used for envelope reinforcement design.

[0029] In some possible embodiments of the structure analysis and design method described above, the "selectively adjusting the reinforcement of the member based on the comparison result" further includes:

[0030] If the floor stress in step S5 is less than or equal to the corresponding floor stress in step S3, and the absolute value of the difference between the two is greater than or equal to 20% of the floor stress in step S3, and the absolute value of the difference between the floor stress in step S5 and the corresponding floor stress in step S4 is greater than or equal to 10% of the floor stress in step S4, then the analysis results obtained in steps S2, S3, S4 and S5 are used for comprehensive envelope reinforcement design.

[0031] In some possible embodiments of the structure analysis and design method described above, the "comprehensive envelope reinforcement design based on the analysis results obtained in steps S2, S3, S4 and S5" includes:

[0032] The analysis result obtained in step S4 is used as the main basis, and the analysis results obtained in steps S2, S3 and S5 are used as auxiliary references, and envelope reinforcement design is performed according to the analysis results obtained in steps S2, S3 and S5 at uncertain positions.

[0033] The above one or more technical solutions of the present application have at least one or more of the following beneficial effects:

[0034] (1) The construction area is divided into ranges based on preset conditions, which can optimize the division range of the reverse construction edge area and the forward construction edge area, ensure that the edge area ring floor formed after the division range is constructed can form an overall enclosure structure with the supporting structure, and also ensure that the ring floor formed by the reverse construction edge area has certain strength and rigidity, thereby ensuring the stability of the interior of the foundation pit;

[0035] (2) By conducting one-dimensional, two-dimensional, three-dimensional, and time-space four-dimensional analyses on the basement portion of the reverse-construction zone, a comprehensive and in-depth understanding of the mechanical behavior of this area under different dimensions can be achieved. Based on the comparative results of these multi-dimensional analyses, the reinforcement design of the basement components can be precisely adjusted, thereby obtaining a specific reinforcement scheme that meets both the actual construction needs and ensures structural safety and stability. This comprehensive analysis method not only improves the scientificity and accuracy of the design but also provides strong support for quality control and safety management during the construction process. Attached Figure Description

[0036] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0037] Figure 1 This is a flowchart of the structural analysis and design method using the edge region reverse construction method provided in Embodiment 1 of the present invention;

[0038] Figure 2 This is a schematic diagram of the one-dimensional analysis of the basement portion of the reverse construction zone according to the present invention.

[0039] Figure 3 This is a schematic diagram illustrating the two-dimensional analysis of the basement portion of the reverse-construction zone in this invention.

[0040] Figure 4 This is a schematic diagram illustrating the three-dimensional analysis of the basement portion of the reverse-construction edge area according to the present invention;

[0041] Figure 5 This is a schematic diagram of the time-space four-dimensional analysis of the basement portion of the reverse construction zone in this invention. Detailed Implementation

[0042] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the invention and are not intended to limit the scope of protection of the invention. Those skilled in the art can make adjustments as needed to adapt to specific applications. Numerous specific details are set forth in the following detailed description to better illustrate the invention. Those skilled in the art should understand that the invention can be practiced without certain specific details.

[0043] Example 1

[0044] like Figure 1 As shown, Figure 1 This is a schematic flowchart illustrating the main steps of a structural analysis and design method using the edge zone reverse construction method provided by the present invention. The structural analysis and design method using the edge zone reverse construction method provided by the present invention includes:

[0045] S1, preliminary structural arrangement is performed on the construction area, the construction area is divided in range based on preset conditions, and an initial top-down side area and a bottom-up center area are obtained;

[0046] It should be noted that the preliminary structural arrangement is performed on the construction area, which includes column grid arrangement, determination of the position of the core wall part of the core tube, determination of the position of the tower and podium part, preliminary determination of the column type, floor thickness, etc. The bottom-up center area refers to the area constructed by the bottom-up method, which is usually located in the central part of the foundation pit. The bottom-up center area is constructed by the bottom-up method, which can ensure the smooth excavation of the foundation pit and provide stable support for the subsequent underground structure construction. The top-down side area refers to the area constructed by the top-down method, which is usually located in the peripheral or edge part of the foundation pit. The top-down side area is constructed by the top-down method, which can reduce the impact of foundation pit excavation on the surrounding environment, improve construction safety, and shorten the construction period.

[0047] The preset conditions include a first condition and a second condition.

[0048] The first condition includes: the basement part of the core tube is attributed to the bottom-up center area, and the remaining part is attributed to the top-down side area. Since the core tube is an important supporting structure of the building, the construction quality and stability of its basement part are crucial. By attributing it to the bottom-up center area, i.e., the core tube basement part is constructed by the bottom-up method, a stable structural system can be gradually constructed, providing a solid foundation for subsequent construction, which helps to enhance the structural stability of the entire building and ensure construction safety and quality.

[0049] The second condition includes: the width of the floor slab of the top-down side area is greater than or equal to 10m, and at least greater than or equal to 1 / 6 of the corresponding side length of the bottom-up center area. A wider floor slab ensures that the floor slab has sufficient width to distribute loads, which can more effectively resist horizontal and vertical loads, reduce structural deformation, and thus enhance the stability of the overall structure. The requirement of the ratio of the floor slab width of the top-down side area to the corresponding side length of the bottom-up center area ensures that the structural connection between the top-down side area and the bottom-up center area has a certain coordination. By maintaining an appropriate proportional relationship, it can ensure that the top-down side area can work together with the bottom-up center area when bearing loads, forming a stable structural system.

[0050] On the basis of the above, the preset conditions further include: the high-rise tower basement of the core tube is generally attributed to the bottom-up center area, and if the column position of the high-rise tower is within the range of the second condition, the column position of the high-rise tower is attributed to the top-down side area. Under the second condition, attributing the column position of the high-rise tower to the top-down side area can make the high-rise tower column adapt to the structure of the top-down side area, ensure the connection between the high-rise tower column and the surrounding structure to be more stable and reliable, and thus improve the lateral force resistance and overturning resistance of the overall structure.

[0051] Further, the preset condition further comprises: if the podium basement adopts the reinforced concrete column, the podium basement belongs to the top-down construction center area. The top-down construction method is usually performed from top to bottom layer by layer, the reinforced concrete column serves as the main bearing structure, can well adapt to the construction sequence, and has good stability and bearing capacity after pouring, can support the weight of the upper structure and resist various loads, therefore, the podium basement adopting the reinforced concrete column generally belongs to the top-down construction center area.

[0052] Further, if the podium basement adopts the steel pipe concrete column, the podium basement belongs to the bottom-up construction edge area. The steel pipe concrete column has high bearing capacity due to the joint action of the steel pipe and the concrete, can well adapt to the needs of the foundation pit excavation and support in the bottom-up construction method, and when the bottom-up construction method allows the structure construction to be performed from bottom to top layer by layer, the construction of the steel pipe concrete column can be performed simultaneously with the foundation pit excavation and support, thereby shortening the construction period, therefore, the podium basement adopting the steel pipe concrete column generally belongs to the bottom-up construction edge area.

[0053] Further, if the podium basement is in the second condition, the podium basement belongs to the bottom-up construction edge area. When the floor width of the bottom-up construction edge area is large enough (greater than or equal to 10 m), it can provide stronger horizontal support force, which helps to resist the lateral pressure generated in the process of foundation pit excavation, in this case, the podium basement is classified as the bottom-up construction edge area, which can make the structure of the podium basement and the overall structure of the bottom-up construction edge area more closely connected, thereby enhancing the stability and lateral force resistance of the overall structure.

[0054] In the present application, the construction area is divided based on the above-mentioned preset conditions, which can optimize the division range of the bottom-up construction edge area and the top-down construction edge area, ensure that the edge area ring floor formed after the division range is constructed can form an overall enclosure structure with the supporting structure, and also ensure that the ring floor formed by the bottom-up construction edge area has certain strength and stiffness, thereby ensuring the stability of the inside of the foundation pit.

[0055] S2、please refer to Figure 2 In the present embodiment, the basement part of the bottom-up construction edge area is analyzed in one dimension, specifically, for the basement part of the bottom-up construction edge area, the floor unit is simplified as a bar unit, and the soil lateral pressure is converted into a uniform load acting on the simplified bar unit, and the stress on the bar unit is obtained through structural mechanics stress analysis. For example, the soil lateral pressure can be calculated by over-excavation depth according to known geological exploration data, and applied to the simplified bar unit, and the projection direction of the maximum stress and the projection direction of the maximum deformation are analyzed.

[0056] In one-dimensional analysis, the floor unit can be simplified as a bar element to reduce the calculation amount, simplify the calculation process, and improve the analysis efficiency. Although the simplification is made, the force analysis based on structural mechanics can still accurately reflect the stress state of the bar element, which helps engineers to more accurately evaluate and optimize the structure in the design stage, and ensures the safety and stability of the structure.

[0057] It should be noted that the calculation method of soil side pressure should be calculated according to the specification, and the overbreak and the generated soil side pressure should be considered, and the two sides of the bar element should be considered as fixed ends. Through one-dimensional analysis, the approximate stress state of the floor can be estimated, and the projection direction of the maximum stress in the reverse construction edge area floor can be directly obtained, and the correctness of the subsequent three-dimensional and four-dimensional analysis design results can be conceptually judged.

[0058] Further, step S2 further comprises: if the side length of the floor unit is less than 1 / 5 of the maximum side length of the forward construction central area, the floor unit is not considered when the floor unit is simplified as a bar element. Since the side length of the floor unit is small, especially much smaller than the maximum side length of the forward construction central area, its contribution (such as stiffness, bearing capacity, etc.) in the actual structure may be relatively small, so ignoring small size floor unit can simplify the calculation model, reduce the calculation amount, and focus the analysis on the main structural components, thereby improving the accuracy of the analysis.

[0059] Further, step S2 further comprises: the length of the bar element is half of the sum of the side length of the corresponding forward construction central area and the side length of the corresponding reverse construction edge area. In the reverse construction method construction process, the structure of the forward construction central area and the reverse construction edge area will influence each other, bear the load together and deform, and the length of the bar element is set to half of the sum of the side lengths of the two, which can reflect the deformation coordination to some extent, so that the analysis model is more consistent with the stress state of the actual structure.

[0060] S3, please refer to Figure 3 The embodiment performs two-dimensional analysis on the basement part of the reverse construction edge area. Specifically, a two-dimensional model of the floor of the reverse construction edge area is established, the soil side pressure calculated in step S2 is added to the periphery, and the unit stress and strain of the analysis are obtained.

[0061] In two-dimensional analysis, the effect of soil side pressure on the floor can be evaluated to assess the bearing capacity and deformation of the floor under actual soil pressure, thereby ensuring the safety of the structure. Analysis of unit stress and strain can reveal the stress distribution in the floor, which helps to find potential stress concentration areas and weak links, and provides a basis for structural optimization design.

[0062] It should be noted that the modeling data of the floor of the top-down construction side area is based on the boundary line determined by the top-down construction side area and the top-down construction center area confirmed in step S1, the thickness of the floor is the thickness of the floor slab determined in the preliminary structural arrangement, and the constraint condition of the floor should be the sun point of the top-down construction side area, which is similar to the constraint position in one-dimensional analysis; Since no vertical support is added in two-dimensional analysis, the stress and strain conditions in the floor plane are more clearly exhibited under the action of soil lateral pressure, and the one-dimensional analysis method can conceptually judge the correctness of the results of subsequent three-dimensional and four-dimensional analysis and design.

[0063] In addition, in the two-dimensional analysis and calculation, the soil lateral pressure is applied to the periphery of the floor plane model established by using the software MidaS Gen or SAP 2000 for operation, and after the unit stress and strain of the analysis are obtained, it is judged whether the unit stress is greater than or equal to the design strength of the concrete, if so, the floor width of the top-down construction side area is increased until the unit stress is less than the design strength of the concrete. When the unit stress exceeds the design strength of the concrete, the structure has the risk of damage, and by increasing the floor width, the overall stiffness of the structure can be improved, which can effectively reduce the unit stress, thereby avoiding the damage of the structure due to excessive stress.

[0064] S4, please refer to Figure 4 In this embodiment, the basement part of the top-down construction side area is analyzed three-dimensionally, specifically, a three-dimensional model of the floor of the top-down construction side area is established, the component parameters are modified in a preset manner, and the overall structural performance information and the corresponding component reinforcement information are obtained.

[0065] In three-dimensional analysis, the structure and stress state of the floor can be more accurately simulated through three-dimensional modeling, so as to comprehensively evaluate the overall performance (including bearing capacity, stiffness, stability, etc.) of the floor. Based on the analysis results of the three-dimensional model, the arrangement of the reinforcement can be optimized, and the overall stiffness and bearing capacity of the structure can be improved. At the same time, the results of three-dimensional analysis can provide certain basis and data support for subsequent four-dimensional analysis.

[0066] It should be noted that when the preliminary structural arrangement of the three-dimensional model is carried out, it includes the preliminary design of the supporting structure, column, beam and floor, and the top-down construction center area should be analyzed with large openings, and the structural performance of the whole foundation pit should be considered, and the structure should be designed from the overall structure.

[0067] Specifically, a three-dimensional design calculation is performed, without considering the actual soil action and the entire construction simulation process, a three-dimensional model of the reverse construction edge area is established by using YJK software according to the floor width, adjusted column grid and corresponding preliminary structure arrangement determined by the two-dimensional analysis, and the component parameters are reasonably modified according to the corresponding requirements of the specification, for example, the stress results of each floor of the three-dimensional model are compared with the analysis results of the one-dimensional analysis in step S2 and the analysis results of the two-dimensional analysis in step S3, and the component parameters are modified according to the comparison results, for example, the reinforcement of the component can be selectively strengthened, wherein the number, diameter and arrangement of the reinforcement are important component parameters.

[0068] S5, please refer to Figure 5 In this embodiment, the basement part of the reverse construction edge area is analyzed by four-dimensional analysis, specifically, a four-dimensional model considering the combined action of soil and main structure is established, and full-process construction simulation analysis is performed.

[0069] In the four-dimensional analysis, the actual soil action, the construction simulation process and the influence of the time factor can be comprehensively considered through the four-dimensional analysis, so that the overall structural performance of the basement part of the reverse construction edge area can be more accurately evaluated, wherein the overall structural performance includes the bearing capacity, stiffness, stability of the structure and the stress state under different construction stages and load conditions, for example, the most unfavorable working condition and stress state of the structure can be determined by establishing a four-dimensional model considering the combined action of soil and main structure and performing full-process construction simulation analysis.

[0070] It should be noted that considering the actual soil action and the entire construction simulation process, modeling can be performed by using the preliminary structure information of YJK in the three-dimensional analysis and the actual survey information by using Midas GTS software, wherein the entire reverse construction edge area has been basically simulated according to the actual situation; since the soil factor needs to be considered at this stage, and the out-of-plane buckling deformation of the floor can be considered, the true situation of the soil in the finite element simulation cannot be completely and truly reflected, therefore, the approximate projection stress results obtained by the one-dimensional analysis, the in-plane stress distribution obtained by the two-dimensional analysis, and the comparison in the four-dimensional analysis should be made.

[0071] Specifically, after establishing a four-dimensional model considering the interaction of soil and main structure and performing the whole-process construction simulation analysis, the analysis results obtained in step S5 four-dimensional analysis are compared with the analysis results obtained in step S2 one-dimensional analysis and step S3 two-dimensional analysis, respectively, and the analysis results of one-dimensional analysis are used as a guide to find out the unfavorable stress points and optimize the structural design. By combining the results of one-dimensional, two-dimensional and four-dimensional analysis, the stress state and performance characteristics of the structure can be more comprehensively understood. Although one-dimensional analysis is simplified, it can quickly reveal the stress extreme points or weak areas of the structure in a specific direction. Therefore, by using one-dimensional analysis as a guide, the unfavorable stress points can be located and evaluated more quickly, and the direction for subsequent optimization design is provided. The optimization design of the structure includes adjusting the size, shape, material or connection method of the component, etc.

[0072] S6, comparing the analysis results obtained in step S5 four-dimensional analysis with the analysis results obtained in step S3 two-dimensional analysis and step S4 three-dimensional analysis, and based on the comparison results, selectively adjusting the component reinforcement information.

[0073] By sequentially performing one-dimensional analysis, two-dimensional analysis, three-dimensional analysis and time-space four-dimensional analysis on the basement part of the reverse construction side area, the mechanical behavior of the area under different dimensions can be comprehensively and deeply understood. Based on the comparison results of these multi-dimensional analysis, the reinforcement design of the basement component can be accurately adjusted, so as to obtain a specific reinforcement scheme that meets the actual construction needs and ensures the safety and stability of the structure. This comprehensive analysis method not only improves the scientificity and accuracy of the design, but also provides strong support for quality control and safety management in the construction process.

[0074] In addition, in order to enable the construction team to correctly and comprehensively understand the structural state and design intention at each stage, a two-set drawing four-stage drawing expression method can be used. Specifically, the reverse construction side area project has a total of four construction stages, which are the first stage: reverse construction side area construction stage, the second stage: normal construction middle area construction stage, the third stage: reverse construction side area local demolition stage, and the fourth stage: permanent use stage. Among them, one set of drawings is used to express the first stage and the third stage, and the other set of drawings is used to express the second stage and the fourth stage.

[0075] Embodiment 2

[0076] On the basis of the above-mentioned embodiments, in order to obtain more optimal component reinforcement information, the present embodiment further provides specific comparison conditions and adjustment methods for selectively adjusting the component reinforcement information based on the comparison results.

[0077] In one embodiment, the step S5 judges whether the floor stress in the four-dimensional analysis is greater than or equal to the corresponding floor stress in the two-dimensional analysis. If the floor stress in the four-dimensional analysis is greater than or equal to the corresponding floor stress in the two-dimensional analysis, and the absolute value of the difference between the two is less than or equal to 30% of the floor stress in the two-dimensional analysis, then the envelope reinforcement design is performed based on the analysis results obtained by the three-dimensional analysis and the four-dimensional analysis.

[0078] Alternatively, if the floor stress in the four-dimensional analysis is less than or equal to the corresponding floor stress in the two-dimensional analysis, and the absolute value of the difference between the two is less than or equal to 20% of the floor stress in the two-dimensional analysis, then the envelope reinforcement design is also performed based on the analysis results obtained by the three-dimensional analysis and the four-dimensional analysis.

[0079] Since the stress conditions in multiple directions and possible load combinations are considered in the four-dimensional analysis, the floor stress in the four-dimensional analysis is more likely to be closer to the actual situation. Meanwhile, the four-dimensional analysis can also consider the nonlinear behavior and time effect of the structure, which can all lead to an increase in the floor stress. Therefore, the floor stress value in the four-dimensional analysis is generally greater than the floor stress value in the two-dimensional analysis. In this case, whether the floor stress value in the four-dimensional analysis is greater than the floor stress value in the two-dimensional analysis, and the difference is within 30%, or the floor stress value in the four-dimensional analysis is not greater than the floor stress value in the two-dimensional analysis, and the difference is within 20%, it indicates that the difference between the four-dimensional analysis and the two-dimensional analysis is within an acceptable range. Since the three-dimensional analysis uses the YJK software to establish a reverse construction side area three-dimensional model according to the floor width, adjusted column grid, and corresponding preliminary structural arrangement determined by the two-dimensional analysis, and the three-dimensional analysis can more accurately reflect the stress conditions of the structure in the three-dimensional space, such as the interaction and deformation coordination between components, compared to the two-dimensional analysis, in this case, the envelope reinforcement design can be performed based on the analysis results of the four-dimensional analysis, and by comparing the results of the three-dimensional analysis and the four-dimensional analysis, to ensure the accuracy and reliability of the design.

[0080] It should be noted that the envelope reinforcement design refers to selecting the most unfavorable stress state for reinforcement design during the design process based on the results of various analysis methods. This method can ensure that the stresses in all directions of the floor are fully considered and addressed, thereby improving the safety and stability of the structure. Among them, the envelope reinforcement design based on the analysis results obtained by the three-dimensional analysis and the four-dimensional analysis can consider the effect of soil confining pressure, which is different from the results of the three-dimensional analysis. Accordingly, the floor parts with larger four-dimensional analysis results are reasonably reinforced with steel bars.

[0081] In addition, the difference between the floor stress in the four-dimensional analysis and the corresponding floor stress in the three-dimensional analysis can also be calculated. If the absolute value of the difference between the floor stress in the four-dimensional analysis and the corresponding floor stress in the three-dimensional analysis is less than or equal to 10% of the floor stress in the three-dimensional analysis, then the analysis results obtained from the three-dimensional analysis and the four-dimensional analysis are used for envelope reinforcement design.

[0082] When the difference between the floor stress in the four-dimensional analysis and the three-dimensional analysis is within 10%, it can be considered that the two analysis methods have high consistency in evaluating the floor stress. This similarity indicates that although the two analysis methods may differ in theoretical framework, calculation model or considered factors, the stress results obtained by them are very close. Therefore, in this case, it is reasonable to use the results of the two analysis methods for envelope reinforcement design, which can ensure the safety of the structure.

[0083] In another embodiment, if the floor stress in the four-dimensional analysis is less than or equal to the corresponding floor stress in the two-dimensional analysis, and the absolute value of the difference between them is greater than or equal to 20% of the floor stress in the two-dimensional analysis, and the absolute value of the difference between the floor stress in the four-dimensional analysis and the corresponding floor stress in the three-dimensional analysis is greater than or equal to 10% of the floor stress in the four-dimensional analysis, then the analysis results obtained from the one-dimensional analysis, the two-dimensional analysis, the three-dimensional analysis and the four-dimensional analysis are used for comprehensive envelope reinforcement design.

[0084] When the results of different analysis methods differ greatly, in order to ensure the safety of the structure, the results of all analysis methods need to be used for comprehensive envelope reinforcement, which means that in the design process, all possible stress conditions will be considered, and the most unfavorable stress state will be selected for reinforcement, so as to ensure the safety of the structure.

[0085] Further, the analysis results obtained from the one-dimensional analysis, the two-dimensional analysis, the three-dimensional analysis and the four-dimensional analysis are used for comprehensive envelope reinforcement, specifically, the analysis results obtained from the three-dimensional analysis are used as the main basis, and the analysis results obtained from the one-dimensional analysis, the two-dimensional analysis and the four-dimensional analysis are used as auxiliary reference, and envelope reinforcement design is carried out according to the analysis results obtained from the one-dimensional analysis, the two-dimensional analysis and the four-dimensional analysis at uncertain places.

[0086] It should be noted that in the reinforcement design, the three-dimensional analysis can more accurately reflect the real stress state of the structure. By considering the stress conditions of the structure in three directions, a more reasonable reinforcement scheme can be designed, thereby improving the bearing capacity and stability of the structure. In addition, three-dimensional analysis can also help engineers optimize the reinforcement layout. By simulating and analyzing the effects of different reinforcement schemes, the optimal reinforcement layout scheme can be selected, improving the economy and construction efficiency of the structure.

[0087] The three-dimensional analysis has significant advantages in the reinforcement design, but the one-dimensional analysis, the two-dimensional analysis and the four-dimensional analysis also have important auxiliary roles. The one-dimensional analysis and the two-dimensional analysis can provide the stress conditions and deformation conditions of the structure in a specific direction, which helps engineers to understand the performance of the structure more comprehensively. The four-dimensional analysis can consider the time factor or more dimensional changes, and provide more abundant information for the reinforcement design. Therefore, in the process of comprehensive envelope reinforcement design, the three-dimensional analysis is taken as the main basis, and the analysis results obtained by the one-dimensional analysis, the two-dimensional analysis and the four-dimensional analysis are taken as auxiliary references, so as to ensure the accuracy and rationality of the reinforcement scheme. Further, the envelope reinforcement is carried out according to the analysis results obtained by the one-dimensional analysis, the two-dimensional analysis and the four-dimensional analysis at the uncertain positions, so as to further improve the safety and reliability of the reinforcement scheme.

[0088] In the present application, by sequentially carrying out one-dimensional analysis, two-dimensional analysis, three-dimensional analysis and time-space four-dimensional analysis on the basement part of the reverse construction side area, the mechanical behavior of the area under different dimensions can be comprehensively and deeply understood. Based on the comparison results of these multi-dimensional analyses, the reinforcement design of the basement component can be accurately adjusted, so as to obtain a specific reinforcement scheme which not only meets the actual needs of construction, but also ensures the safety and stability of the structure. This comprehensive analysis method not only improves the scientificity and accuracy of the design, but also provides strong support for quality control and safety management in the construction process.

[0089] So far, the technical solutions of the present application have been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical solutions after the changes or replacements will all fall within the protection scope of the present application.

Claims

1. A method for structural analysis and design using a perimeter inverse construction method, characterized by, The structural analysis and design method comprises: S1, preliminarily arranging the construction area, dividing the construction area based on preset conditions to obtain an initial reverse construction edge area and a forward construction central area; Wherein, the preset conditions include a first condition and a second condition; The first condition includes: attributing the basement part of the core tube to the forward construction central area, and attributing the remaining part to the reverse construction edge area; The second condition includes: the width of the floor slab of the reverse construction edge area is greater than or equal to 10m, and is at least greater than or equal to 1 / 6 of the corresponding side length of the forward construction central area; The preset conditions further include: The basement of the high-rise tower of the core tube is attributed to the forward construction central area, and if the column position of the high-rise tower is within the range of the second condition, the column position of the high-rise tower is attributed to the reverse construction edge area; and / or If the basement of the podium adopts reinforced concrete columns, the basement of the podium is attributed to the forward construction central area; if the basement of the podium adopts steel pipe concrete columns or in the case of the second condition, the basement of the podium is attributed to the reverse construction edge area; S2, for the basement part of the reverse construction edge area, simplifying the floor slab unit into a bar unit, and proportionally converting the earth side pressure to form a uniform load acting on the bar unit, and analyzing to obtain the stress condition on the bar unit; Wherein, step S2 includes: If the side length of the floor slab unit is less than 1 / 5 of the maximum side length of the forward construction central area, the floor slab unit is not considered when simplifying the floor slab unit into the bar unit; and / or The length of the bar unit is half of the sum of the side length of the corresponding forward construction central area and the side length of the corresponding reverse construction edge area; S3, establishing a two-dimensional model of the floor slab of the reverse construction edge area, adding the earth side pressure calculated in step S2 to the periphery to obtain the unit stress and strain of the analysis; S4, establishing a three-dimensional model of the floor slab of the reverse construction edge area, modifying the component parameters in a preset manner to obtain the overall structural performance information and the corresponding component reinforcement information; S5, establishing a four-dimensional model considering the interaction of soil and main structure, and performing full-process construction simulation analysis; S6, comparing the analysis results obtained in step S5 with the analysis results obtained in steps S3 and S4, and selectively adjusting the component reinforcement information based on the comparison results; Wherein, the "selectively adjusting the component reinforcement information based on the comparison results" includes: If the floor slab stress in step S5 is greater than or equal to the corresponding floor slab stress in step S3, and the absolute value of the difference between the two is less than or equal to 30% of the floor slab stress in step S3, then the analysis results obtained in steps S4 and S5 are used for envelope reinforcement design; or If the floor slab stress in step S5 is less than or equal to the corresponding floor slab stress in step S3, and the absolute value of the difference between the two is less than or equal to 20% of the floor slab stress in step S3, then the analysis results obtained in steps S4 and S5 are used for envelope reinforcement design; or If the absolute value of the difference between the floor stress in step S5 and the corresponding floor stress in step S4 is less than or equal to 10% of the floor stress in step S4, the analysis results obtained in steps S4 and S5 are used for envelope reinforcement design; or If the floor stress in step S5 is less than or equal to the corresponding floor stress in step S3, and the absolute value of the difference between them is greater than or equal to 20% of the floor stress in step S3, and the absolute value of the difference between the floor stress in step S5 and the corresponding floor stress in step S4 is greater than or equal to 10% of the floor stress in step S4, the analysis results obtained in steps S2, S3, S4 and S5 are used for comprehensive envelope reinforcement design.

2. The structural analysis and design method using the edge zone top-down method according to claim 1, wherein, After obtaining the unit stress and strain of the analysis, step S3 further comprises: determining whether the unit stress is greater than or equal to the design strength of the concrete, and if so, increasing the floor width of the reverse construction edge area until the unit stress is less than the design strength of the concrete.

3. The structural analysis and design method using the edge zone top-down method according to claim 1, wherein, The "modifying the component parameters in a preset manner" comprises: comparing the stress results of each floor of the three-dimensional model with the analysis results of step S2 and step S3 respectively, and modifying the component parameters according to the comparison results.

4. The structural analysis and design method using the top-down method of claim 1, wherein, After establishing the four-dimensional model considering the interaction between soil and main structure and performing the whole-process construction simulation analysis, the structure analysis and design method further comprises: comparing the analysis results obtained in step S5 with the analysis results obtained in steps S2 and S3 respectively, and finding out the unfavorable stress points and optimizing the structure design according to the analysis results of step S2.

5. The structural analysis and design method using the top-down method of claim 1, wherein, The "comprehensive envelope reinforcement design using the analysis results obtained in steps S2, S3, S4 and S5" comprises: using the analysis results obtained in step S4 as the main basis, and combining the analysis results obtained in steps S2, S3 and S5 as auxiliary reference, and performing envelope reinforcement design according to the analysis results obtained in steps S2, S3 and S5 at uncertain places. The "comprehensive envelope reinforcement design using the analysis results obtained in steps S2, S3, S4 and S5" comprises: using the analysis results obtained in step S4 as the main basis, and combining the analysis results obtained in steps S2, S3 and S5 as auxiliary reference, and performing envelope reinforcement design according to the analysis results obtained in steps S2, S3 and S5 at uncertain places.

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