Building structure design method considering residual deformation of goaf

Abstract

The invention belongs to the field of building structure design, and particularly relates to a building structure design method considering residual deformation of a goaf. In the upper building structure model, inputting goaf residual deformation prediction data; setting parameters of a goaf building model, including deformation design of an upper structural member and deformation design of a building foundation; judging whether the upper structure deformation design meets design requirements or not, and if yes, entering the next step; if not, adjusting the rigidity of the structural system and the component until the requirements are met; judging whether the building foundation deformation design meets design requirements or not, and if yes, entering the next step; if not, foundation reinforcement and deformation resistance measures are adopted until the requirements are met; designing internal force of an upper building structure; reinforcement design is carried out; and generating a final upper building model.

Description

Technical Field

[0001] This invention belongs to the field of architectural design, specifically relating to a building structure design method that takes into account the residual deformation of mining subsidence areas. Background Technology

[0002] In mineral resource mining areas, especially when constructing projects above underground coal seam goafs, it is necessary to treat the goaf foundation to ensure building safety. Currently, grouting is the mainstream technique for treating goafs. However, the inventors recognized that even after conventional treatment, due to the inherent compressibility of the filling material, the unavoidable incomplete and uneven filling during engineering implementation, the long-term "activation" effect caused by stress adjustment in the underlying rock strata, and changes in the groundwater environment, the treated goaf foundation cannot fully restore to the original stress balance state before mining. This results in continuous and long-term residual deformation of the surface due to the goaf's influence throughout the building's service life.

[0003] Currently, there is a significant imbalance in technological development in this field: while research on predicting future residual deformation of the surface in goaf areas is relatively mature, there is a serious lack of standards and insufficient research on how to systematically consider and mitigate the effects of such deformation during the structural design phase. This directly leads to the following key technical challenges when constructing on goaf foundations: 1) Lack of combined calculation methods and deformation limits for building foundations in goaf areas: The current standard, "Technical Specification for Foundation Treatment of Buildings (Structures) in Coal Mine Goaf Areas," only specifies the limits for the deformation rate, horizontal deformation, and tilt of the foundation after goaf treatment. Meanwhile, the "Code for Design of Building Foundations" also specifies the limits for settlement and differential settlement of ordinary building foundations. However, the standards do not clearly define how to combine the residual deformation of the goaf area with the foundation settlement caused by building loads, or how to determine the settlement limits for building foundations in goaf areas. This leaves designers without a unified basis to assess the total deformation of building foundations, resulting in a lack of guidelines for foundation design on goaf ground. 2) Lack of evaluation standards for additional deformation of the superstructure in goaf areas: Residual deformations on the surface of goaf areas (such as subsidence and tilting) are transmitted to the superstructure, which is equivalent to applying forced displacement to the vertical components (walls and columns) of the building. This forced displacement will cause significant additional deformation in horizontal components such as beams and slabs. Currently, there is a lack of clear normative basis on how to combine this additional deformation with deformations caused by other loads (such as static and live loads), and how to determine its own deformation limits, which brings uncertainty to the safety evaluation of the superstructure.

[0004] 3) Lack of Design and Combination of Additional Internal Forces in the Superstructure of Buildings in Goaf Areas: More critically, the aforementioned forced displacements generate significant additional internal forces in the superstructure. Current structural design codes do not include provisions for load effect combinations related to the internal forces caused by residual deformation in goaf areas. Therefore, how to quantitatively consider the impact of these additional internal forces and combine them with conventional load internal forces is a gap in current structural design theory. Ignoring this issue could lead to unsafe structural designs and serious hidden dangers. Summary of the Invention

[0005] This invention addresses the technical challenges of managing buildings in goaf areas, including high construction costs and numerous potential hazards. It provides a systematic, quantitative, and practical building structure design method that considers residual deformation in goaf areas, thus providing a basis for the design of superstructure buildings in goaf areas.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: The present invention proposes a building structure design method that considers residual deformation in goaf areas, specifically including the following steps: Step 1: Establish a building model of the goaf and input the prediction data of residual deformation of the goaf; Step 2: Set the building model parameters for the goaf area, including the deformation design of the superstructure components and the deformation design of the building foundation; Step 3: Determine whether the deformation design of the superstructure meets the design requirements. If it does, proceed to the next step. Otherwise, adjust the structural system and component stiffness until the requirements are met. Determine whether the deformation design of the building foundation meets the design requirements. If it does, proceed to the next step. Otherwise, adopt foundation reinforcement and anti-deformation measures until the requirements are met. Step 4: Perform internal force design for the superstructure; Step 5: Design reinforcement details; Step 6: Generate the final superstructure model.

[0007] As a further technical solution, the aforementioned building foundation deformation design includes the calculation of building foundation deformation in the goaf area and the deformation limit of building foundation in the goaf area.

[0008] As a further technical solution, the deformation calculation of the building foundation in the goaf area is as follows: According to the specifications, when calculating foundation deformation, the quasi-permanent combination under the serviceability limit state should be used; the following formula can be used for calculating the foundation deformation of buildings in the district:

[0009] In the formula: - The deformation value of the foundation under the action of the superstructure load can be calculated according to the "Code for Design of Building Foundation". - Coefficient of quasi-permanent value of residual deformation in goaf; - Residual deformation in the goaf.

[0010] As a further technical solution, the deformation limit of the building foundation in the goaf area can be implemented in accordance with the provisions of the "Code for Design of Building Foundation".

[0011] As a further technical solution, the design method for the internal forces of the superstructure is as follows: For horizontal members mainly subjected to bending: the internal forces at the support under the residual deformation condition of the goaf are compared with the internal forces under the seismic condition, and the envelope value is taken and combined with the internal forces under other conditions; the internal forces at the mid-span under the residual deformation condition of the goaf are treated as special live loads and combined with the internal forces under the seismic condition and other conditions. For vertical support components, the internal forces under the residual deformation condition of the goaf are treated as special live loads and combined with the internal forces under seismic conditions and other conditions.

[0012] As a further technical solution, when the residual deformation in the goaf is unfavorable, the partial factor values ​​are as follows: When the goaf is in an active phase, the settlement rate is high (≥1.0 mm / d) and shows no signs of decay, with a partial factor... The value is 1.5.

[0013] When the goaf is in the decay phase, the settlement rate is slow (≤1.0 mm / d and gradually decreases, with a cumulative settlement ≥30 mm over 6 consecutive months) and continues to decrease, with a partial factor... The value is 1.4; When the goaf is in a stable state, the settlement rate is slow (≤0.2mm / d and gradually decreases, with a cumulative settlement of <30mm over 6 consecutive months). (Partial factor) The value is 1.3.

[0014] When the residual deformation effect in the goaf is favorable, the partial factor is taken as 0.

[0015] As a further technical solution, the combination value coefficient of residual deformation in the goaf is closely related to the goaf state. The more stable the goaf, the smaller the combination value coefficient. The value of the combination value coefficient of residual deformation in the goaf is determined by the following. When the goaf is in an active phase, the settlement rate is high (≥1.0 mm / d) and shows no signs of decay, resulting in a high combination value coefficient. The value range is 0.9 to 1.0; When the goaf is in the decay phase, the settlement rate is slow (≤1.0 mm / d and gradually decreases, with a cumulative settlement ≥30 mm over 6 consecutive months) and continues to decline, resulting in a combination value coefficient. The value range is 0.7 to 0.9; When the goaf is in a stable state, the settlement rate is slow (≤0.2mm / d and gradually decreases, with a cumulative settlement of <30mm over 6 consecutive months). The combination value coefficient... The value range is 0.6 to 0.7.

[0016] As a further technical solution, the deformation design of the upper structure components of the goaf building includes the calculation and limit requirements of the horizontal displacement of the upper structure of the goaf building, the calculation and limit requirements of the deflection of the upper structure components of the goaf building, and the calculation and limit requirements of the cracks in the upper structure components of the goaf building.

[0017] As a further technical solution, the calculation method for the horizontal displacement and limit requirements of the superstructure of buildings in the goaf area is as follows: The horizontal displacement of the superstructure of a building in a goaf can be calculated using the following formula:

[0018] In the formula: - Horizontal displacement of the superstructure under wind load; - Coefficient of quasi-permanent value of residual deformation in goaf; - Horizontal displacement of the superstructure caused by residual deformation in the goaf.

[0019] The horizontal displacement calculation of the superstructure of buildings in the goaf area must meet the following requirements:

[0020] In the formula: - The horizontal displacement limit of the superstructure can be determined according to the current specifications; As a further technical solution, the calculation method for the deflection and limit requirements of the superstructure components of buildings in the goaf area is as follows: The deflection of the superstructure components of a building in a goaf can be calculated using the following formula:

[0021] In the formula: - The mid-span deflection value of the superstructure members under vertical dead and live loads can be calculated according to the current "Code for Design of Concrete Structures"; - Mid-span deflection of upper structure components caused by residual deformation in the goaf.

[0022] Calculate the mid-span deflection of the superstructure components caused by residual deformation in the goaf. First, the additional bending moment of the corresponding position of the horizontal component under the residual deformation condition in the goaf is extracted from the calculation results by the software. The corresponding additional internal force under the quasi-permanent combination is: =

[0023] In the formula: - Coefficient of quasi-permanent value of residual deformation in goaf; Then, substitute the additional internal forces under the corresponding combinations mentioned above into the standard deflection calculation formula to calculate the deflection value of the superstructure components under the residual deformation of the goaf. ; The deflection calculation of the superstructure components of buildings in the goaf area must meet the following requirements:

[0024] In the formula: - The deflection limit of the superstructure components can be determined according to the current specifications; As a further technical solution, the calculation method for cracks and limit requirements of the superstructure components of buildings in goaf areas is as follows: Considering the long-term effect of residual deformation in the goaf within its design service life, a quasi-permanent combination is adopted for the combination with other vertical loads. The deflection of the superstructure components of the goaf building can be calculated using the following formula:

[0025] In the formula: - The crack values ​​of the superstructure members under vertical dead and live loads can be calculated according to the current "Code for Design of Concrete Structures"; - Crack values ​​of upper structural components under residual deformation in the goaf.

[0026] Considering that horizontal members are generally tension-bending members, calculate the mid-span cracks in the superstructure members caused by residual deformation in the goaf. At that time, the additional bending moment and additional axial force at the corresponding position of the horizontal component under the residual deformation condition in the goaf can be extracted from the software calculation results. The corresponding additional internal force under the quasi-permanent combination is: =

[0027] =

[0028] In the formula: - Quasi-permanent value coefficient of residual deformation in goaf.

[0029] Then, the additional internal forces under the corresponding combinations mentioned above are substituted into the standard crack calculation formula to calculate the crack values ​​of the superstructure components under the action of residual deformation in the goaf. ; The crack calculation for the superstructure components of buildings in goaf areas must meet the following requirements:

[0030] In the formula: - The crack limit for the superstructure components can be determined according to the current specifications.

[0031] As a further technical solution, the quasi-permanent value coefficient of residual deformation in the goaf is closely related to the goaf state. The more stable the goaf, the smaller the combination value coefficient. The value of the quasi-permanent value coefficient of residual deformation in the goaf is determined by the following: When the goaf is in an active phase, the settlement rate is high (≥1.0 mm / d) and shows no signs of decay, resulting in a high quasi-permanent value coefficient. The value range is 0.7 to 0.9; When the goaf is in the decay phase, the settlement rate is slow (≤1.0mm / d and gradually decreases, with a cumulative settlement ≥30mm over 6 consecutive months) and continues to decrease. The quasi-permanent value coefficient is [not specified] when the structural design service life is 25 years. The quasi-permanent value coefficient, with a value range of 0.5 to 0.6, is used when the structural design service life is 50 years. The value range is 0.6 to 0.7. When the goaf is in a stable state, the settlement rate is slow (≤0.2mm / d and gradually decreases, with a cumulative settlement of <30mm over 6 consecutive months). The quasi-permanent value coefficient is calculated for a structural design service life of 25 years. The quasi-permanent value coefficient has a value range of 0.4 to 0.5 and a structural design service life of 50 years. The quasi-permanent coefficient, with a value range of 0.5 to 0.6, is used when the structural design service life is 100 years. The value range is 0.6 to 0.7.

[0032] The technical solution adopted in this invention is as follows: This invention provides a building structure design method that considers residual deformation in goaf areas. It proposes a systematic and complete design process, including calculation assumptions and parameter settings for goaf building models, design methods for foundation deformation in goaf buildings, design methods for internal forces in the superstructure of goaf buildings, and design methods for deformation of the superstructure of goaf buildings. It also provides partial factors, combination value partial factors, and quasi-permanent value partial factors for the residual deformation effect in goaf areas, filling the gaps in existing standards and technologies, and providing important references and basis for the design of superstructures in goaf areas. Attached Figure Description

[0033] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0034] Figure 1 A flowchart of the building structure design method considering residual deformation in goaf areas proposed in this invention; Detailed Implementation It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0035] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. As described in the background section, there are shortcomings in the existing technology. In order to solve the above-mentioned technical problems, this invention proposes a building structure design method that takes into account the residual deformation of the goaf.

[0036] In a typical embodiment of the present invention, such as Figure 1 As shown, this embodiment provides a building structure design method that considers the residual deformation of the goaf, specifically including the following steps: Step 1: Establish a building model of the goaf and input the prediction data of residual deformation of the goaf; Step 2: Set the building model parameters for the goaf area, including the deformation design of the superstructure components and the deformation design of the building foundation; Step 3: Determine whether the deformation design of the superstructure meets the design requirements. If it does, proceed to the next step. Otherwise, adjust the structural system and component stiffness until the requirements are met. Determine whether the deformation design of the building foundation meets the design requirements. If it does, proceed to the next step. Otherwise, adopt foundation reinforcement and anti-deformation measures until the requirements are met. Step 4: Perform internal force design for the superstructure; Step 5: Design reinforcement details; Step 6: Generate the final superstructure model.

[0037] The following is a detailed explanation of each step. The following points should be noted when creating the building model of the goaf in step 1 above: (1) When the subsidence rate of the goaf is fast and the curvature value is large, the structural design should take into account the impact of the construction process. It is advisable to use the layered loading method to simulate the impact of the residual deformation of the goaf during the construction process. When the subsidence rate of the goaf is slow and the curvature value is small, the impact of the residual deformation of the goaf can be calculated based on the overall stiffness of the structure under a single loading. (2) When verifying the overall horizontal displacement of the structure caused by the residual deformation of the goaf, the beam stiffness increase factor or the floor slab stiffness should be considered as an elastic plate, but the reduction of the stiffness of the connecting beam should not be included. (3) The residual deformation of the goaf will cause the superstructure to tilt and deform. It is recommended to consider the influence of the second-order effect of the structure's gravity when performing calculations and analyses. (4) The influence of residual deformation of the goaf on the foundation and superstructure is calculated using finite element analysis software. The residual deformation of the goaf is input into the software as a displacement load.

[0038] The design method for foundation deformation in the goaf area in step 2 above is as follows: This section mainly defines two parts: the calculation of building foundation deformation in the goaf area and the deformation limit of building foundation in the goaf area.

[0039] (1) Calculation of building foundation deformation in goaf According to the specifications, when calculating foundation deformation, the quasi-permanent combination of forces under the serviceability limit state should be used. The following formula can be used for calculating the foundation deformation of buildings in the district:

[0040] In the formula: - The deformation value of the foundation under the action of the superstructure load can be calculated according to the "Code for Design of Building Foundation". - Coefficient of quasi-permanent value of residual deformation in goaf; - Residual deformation in the goaf.

[0041] The residual deformation of the foundation in a goaf is a long-term and unavoidable type of foundation deformation. The foundation deformation caused by the goaf is definite. Determining the quasi-permanent value coefficient means judging what proportion of the residual deformation in the goaf can occur within the structure's "design service life." This is closely related to the stability state of the goaf and its design service life. To obtain accurate data, it is necessary to predict the deformation development within the structure's "design service life" based on monitoring data. Considering the above factors, when reliable monitoring data is unavailable, the quasi-permanent value coefficient of the residual deformation in the goaf can also be taken from the table.

[0042] Table 1. Suggested values ​​for the quasi-permanent value coefficient of residual deformation in goaf areas.

[0043] (2) Deformation limit requirements for building foundations in goaf areas Compared with the current standards, the "Technical Specification for Foundation Treatment of Buildings (Structures) in Coal Mine Goaf Areas" has stricter requirements on the inclination of foundations for buildings in goaf areas than the "Code for Design of Building Foundations". It also specifies the deformation rate and horizontal deformation limit requirements for foundations in goaf areas. Therefore, the deformation rate, horizontal deformation and inclination limit of foundations for buildings in goaf areas must meet the requirements of the current standard "Technical Specification for Foundation Treatment of Buildings (Structures) in Coal Mine Goaf Areas".

[0044] Considering that buildings in goaf areas are more sensitive to foundation deformation rate, horizontal deformation and tilt, but not to overall settlement, and since the "Technical Specification for Foundation Treatment of Buildings (Structures) in Coal Mine Goaf Areas" does not make clear requirements on the settlement limit of buildings in goaf areas, it is recommended that the settlement limit of buildings in goaf areas be implemented in accordance with the provisions of the "Code for Design of Building Foundation".

[0045] The internal force design method for the superstructure components of the building in the goaf area in step 4 above is as follows: The residual deformation of the surface in the goaf (such as subsidence and tilting) will be transmitted to the superstructure, which is equivalent to applying forced displacement to the vertical components (walls and columns) of the building. This will generate additional internal forces in the superstructure that cannot be ignored, leading to cracking or even strength failure of the superstructure. Therefore, it is necessary to increase the cross-section of beams and columns and the reinforcement to enhance the load-bearing capacity of the components.

[0046] Considering that residual deformation in the goaf is a special type of live load and is an uncontrollable factor, blindly increasing the reinforcement of the superstructure when the residual deformation in the goaf is small or even non-existent may result in a "strong beam, weak column" structure, which may affect the seismic performance of the structure.

[0047] Based on the above reasons, the internal forces of structural members should be considered according to the following principles: (1) For horizontal members such as beams that are mainly subjected to bending: the internal forces at the support under the residual deformation condition of the goaf are compared with the internal forces under the seismic condition, and the envelope value is combined with the internal forces under other conditions; the internal forces at the mid-span under the residual deformation condition of the goaf are treated as special live loads and combined with the internal forces under the seismic condition and other conditions. (2) For vertical support components such as columns, the internal forces under the residual deformation condition of the goaf are used as special live loads and combined with the internal forces under the seismic condition and other conditions.

[0048] When combining internal forces, the calculation formula is as follows: Combination of effects of variable load control:

[0049] Combination of effects of permanent combined control:

[0050] In the formula: -No.j The partial factors for each permanent load shall be determined according to the specifications. -No. i The partial factors for each variable load shall be determined according to the specifications. -No. i The adjustment factor for each variable load takes into account the design service life and is determined according to the specifications. -According to the j-th permanent load standard value The calculated load effect values ​​are taken according to the specifications; -According to the j-th variable load standard value The calculated load effect values, where The controllable variable load effects, except for the special live load of residual deformation in the goaf, can all be taken according to the specifications. -No. i A variable load The combination coefficient, except for the special live load of residual deformation in the goaf, shall be taken according to the specifications. Based on the above calculation formula, it is possible to determine the partial factor for the special live load of residual deformation in the goaf. The combined value coefficients take the following values. Importantly, there are currently no clear standards or literature references for this.

[0051] Although the residual deformation effect of the goaf is full of uncertainties, it is closely related to the goaf condition. The more stable the goaf, the smaller the partial factor. When the residual deformation effect of the goaf is unfavorable, the suggested values ​​of the partial factor are shown in Table 2.

[0052] Table 2. Suggestions for the selection of partial factors when residual deformation in the goaf is unfavorable.

[0053] Considering that the residual deformation of the goaf may have a beneficial effect on the upper local structure, such as "reverse arching" or "prestressing effect", the partial factor is taken as 0 when the effect of the residual deformation of the goaf is beneficial.

[0054] The load combination value factor is a reduction factor used to consider the probability that the values ​​of two or more variable loads will simultaneously reach their maximum values ​​when two or more variable loads act on the structure at the same time. Based on the above principles, the combination value factor of residual deformation in goaf areas is closely related to the goaf condition; the more stable the goaf, the smaller the combination value factor. Recommendations for the value of the combination value factor of residual deformation in goaf areas are shown in Table 3.

[0055] Table 3. Suggestions for the Values ​​of the Combination Coefficients of Residual Deformation in Goaf Areas

[0056] Furthermore, the deformation design method for the superstructure components of the goaf building in step 2 above is as follows: This section mainly defines two parts: the calculation and limit requirements for the horizontal displacement of the superstructure of buildings in the goaf area, the calculation and limit requirements for the deflection of the superstructure components of buildings in the goaf area, and the calculation and limit requirements for the cracks in the superstructure components of buildings in the goaf area.

[0057] (1) Calculation and limit requirements for horizontal displacement of the superstructure of buildings in the goaf The horizontal displacement of the superstructure caused by the residual deformation of the foundation in the goaf is long-term and unavoidable. Therefore, it is necessary to consider the combination with other common load effects. Current specifications stipulate the calculation and limit requirements for horizontal displacement of wind load and seismic load. Considering the long-term effect of the residual deformation of the goaf within the design service life, it can be considered to perform a combined calculation with wind load. The load combination adopts a quasi-permanent combination. The horizontal displacement of the superstructure of the building in the goaf can be calculated by the following formula:

[0058] In the formula: - Horizontal displacement of the superstructure under wind load; - The coefficient of quasi-permanent value of residual deformation in the goaf can be taken from Table 1; - Horizontal displacement of the superstructure caused by residual deformation in the goaf.

[0059] The horizontal displacement calculation of the superstructure of buildings in the goaf area must meet the following requirements:

[0060] In the formula: - The horizontal displacement limit of the superstructure can be determined according to the current specifications; (2) Calculation and limit requirements for deflection of superstructure components of buildings in goaf areas Considering the long-term effect of residual deformation in the goaf within its design service life, a quasi-permanent combination is adopted for the combination with other vertical loads. The deflection of the superstructure components of the goaf building can be calculated using the following formula:

[0061] In the formula: - The mid-span deflection value of the superstructure members under vertical dead and live loads can be calculated according to the current "Code for Design of Concrete Structures"; - Mid-span deflection of upper structure components caused by residual deformation in the goaf.

[0062] Calculate the mid-span deflection of the superstructure components caused by residual deformation in the goaf. First, the additional bending moment of the corresponding position of the horizontal component under the residual deformation condition in the goaf is extracted from the calculation results by the software. The corresponding additional internal force under the quasi-permanent combination is: =

[0063] In the formula: - The quasi-permanent value coefficient of residual deformation in the goaf can be obtained according to Table 1.

[0064] Then, substitute the additional internal forces under the corresponding combinations mentioned above into the standard deflection calculation formula to calculate the deflection value of the superstructure components under the residual deformation of the goaf. .

[0065] The deflection calculation of the superstructure components of buildings in the goaf area must meet the following requirements:

[0066] In the formula: - The deflection limit of the superstructure components can be determined according to the current specifications; (3) Calculation and limit requirements for cracks in the superstructure components of buildings in goaf areas Considering the long-term effect of residual deformation in the goaf within its design service life, a quasi-permanent combination is adopted for the combination with other vertical loads. The deflection of the superstructure components of the goaf building can be calculated using the following formula:

[0067] In the formula: - The crack values ​​of the superstructure members under vertical dead and live loads can be calculated according to the current "Code for Design of Concrete Structures"; - Crack values ​​of upper structural components under residual deformation in the goaf.

[0068] Considering that horizontal members are generally tension-bending members, calculate the mid-span cracks in the superstructure members caused by residual deformation in the goaf. At that time, the additional bending moment and additional axial force at the corresponding position of the horizontal component under the residual deformation condition in the goaf can be extracted from the software calculation results. The corresponding additional internal force under the quasi-permanent combination is: =

[0069] =

[0070] In the formula: - The quasi-permanent value coefficient of residual deformation in the goaf can be obtained according to Table 1.

[0071] Then, the additional internal forces under the corresponding combinations mentioned above are substituted into the standard crack calculation formula to calculate the crack values ​​of the superstructure components under the action of residual deformation in the goaf. .

[0072] The crack calculation for the superstructure components of buildings in goaf areas must meet the following requirements:

[0073] In the formula: - The crack limit value for the superstructure components can be taken according to the current specifications; This invention proposes a building structure design method that considers the residual deformation of goaf areas. It presents a systematic and complete design process, including calculation assumptions and parameter settings for goaf building models, design methods for foundation deformation of goaf buildings, design methods for internal forces of the superstructure of goaf buildings, and design methods for deformation of the superstructure of goaf buildings. It also provides partial factors, combination value partial factors, and quasi-permanent value partial factors for the residual deformation effect of goaf areas, filling the gaps in existing standards and technologies, and providing important references and basis for the design of superstructures of goaf buildings.

[0074] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A building structure design method considering residual deformation in goaf areas, characterized in that, Includes the following steps: Step 1: Establish a building model of the goaf and input the prediction data of residual deformation of the goaf; Step 2: Set the building model parameters for the goaf area, including the deformation design of the superstructure components and the deformation design of the building foundation; Step 3: Determine whether the deformation design of the superstructure meets the design requirements. If it does, proceed to the next step. Otherwise, adjust the structural system and component stiffness until the requirements are met; Determine whether the building foundation deformation design meets the design requirements. If it does, proceed to the next step. Otherwise, foundation reinforcement and deformation-resistant measures shall be adopted until the requirements are met; Step 4: Perform internal force design for the superstructure; Step 5: Design reinforcement details; Step 6: Generate the final superstructure model.

2. The building structure design method considering residual deformation in the goaf as described in claim 1, characterized in that, The aforementioned building foundation deformation design includes the calculation of building foundation deformation in the goaf area and the deformation limit value of building foundation in the goaf area.

3. The building structure design method considering residual deformation in the goaf as described in claim 2, characterized in that, The deformation calculation of the building foundation in the goaf area is as follows: In the formula: - The deformation value of the foundation under the action of the superstructure load can be calculated according to the "Code for Design of Building Foundation". - Coefficient of quasi-permanent value of residual deformation in goaf; - Residual deformation in the goaf.

4. The building structure design method considering residual deformation in the goaf as described in claim 1, characterized in that, The deformation design of the superstructure components of the goaf building includes the calculation and limit requirements of the horizontal displacement of the superstructure of the goaf building, the calculation and limit requirements of the deflection of the superstructure components of the goaf building, and the calculation and limit requirements of the cracks in the superstructure components of the goaf building.

5. The building structure design method considering residual deformation in the goaf as described in claim 4, characterized in that, The calculation method for the horizontal displacement and limit requirements of the superstructure of buildings in goaf areas is as follows: The horizontal displacement of the superstructure of a building in a goaf can be calculated using the following formula: In the formula: - Horizontal displacement of the superstructure under wind load; - Coefficient of quasi-permanent value of residual deformation in goaf; - Horizontal displacement of the superstructure caused by residual deformation in the goaf; The horizontal displacement calculation of the superstructure of buildings in the goaf area must meet the following requirements: In the formula: - The horizontal displacement limit of the superstructure can be determined according to the current specifications.

6. The building structure design method considering residual deformation in the goaf as described in claim 4, characterized in that, goaf The calculation methods for the deflection and limit requirements of building superstructure components are as follows: The deflection of the superstructure components of a building in a goaf can be calculated using the following formula: In the formula: - The mid-span deflection value of the superstructure members under vertical dead and live loads can be calculated according to the current specifications; - Mid-span deflection of superstructure components caused by residual deformation in the goaf; Calculate the mid-span deflection of the superstructure components caused by residual deformation in the goaf. First, the additional bending moment of the corresponding position of the horizontal component under the residual deformation condition in the goaf is extracted from the calculation results by the software. The corresponding additional internal force under the quasi-permanent combination is: = In the formula: - Coefficient of quasi-permanent value of residual deformation in goaf; Then, substitute the additional internal forces under the corresponding combinations mentioned above into the standard deflection calculation formula to calculate the deflection value of the superstructure components under the residual deformation of the goaf. ; The deflection calculation of the superstructure components of buildings in the goaf area must meet the following requirements: In the formula: - The deflection limit of the superstructure components can be determined according to the current specifications.

7. The building structure design method considering residual deformation in the goaf as described in claim 4, characterized in that, goaf The calculation method for cracks in the superstructure components of a building and the limit requirements for crack values ​​are as follows: Considering the long-term effect of residual deformation in the goaf within its design service life, a quasi-permanent combination is adopted for the combination with other vertical loads. The deflection of the superstructure components of the goaf building can be calculated using the following formula: In the formula: - The crack values ​​of the superstructure members under vertical dead and live loads can be calculated according to the current specifications; - Crack values ​​of upper structural components under residual deformation in the goaf; Considering that horizontal members are generally tension-bending members, calculate the mid-span cracks in the superstructure members caused by residual deformation in the goaf. At that time, the additional bending moment and additional axial force at the corresponding position of the horizontal component under the residual deformation condition in the goaf can be extracted from the software calculation results. The corresponding additional internal force under the quasi-permanent combination is: = = In the formula: - Coefficient of quasi-permanent value of residual deformation in goaf; Then, the additional internal forces under the corresponding combinations mentioned above are substituted into the standard crack calculation formula to calculate the crack values ​​of the superstructure components under the action of residual deformation in the goaf. ; The crack calculation for the superstructure components of buildings in goaf areas must meet the following requirements: In the formula: - The crack limit for the superstructure components can be determined according to the current specifications.

8. The building structure design method considering residual deformation in goaf areas as described in any one of claims 3, 5, 6, and 7, characterized in that, The quasi-permanent value coefficient of residual deformation in goaf is closely related to the goaf state. The more stable the goaf, the smaller the combination value coefficient. The value of the quasi-permanent value coefficient of residual deformation in goaf is determined by the following: When the goaf is in an active phase, the settlement rate is high (≥1.0 mm / d) and shows no signs of decay, resulting in a high quasi-permanent value coefficient. The value range is 0.7 to 0.9; When the goaf is in the decay phase, the settlement rate is slow (≤1.0mm / d and gradually decreases, with a cumulative settlement ≥30mm over 6 consecutive months) and continues to decrease. The quasi-permanent value coefficient is [not specified] when the structural design service life is 25 years. The quasi-permanent value coefficient, with a value range of 0.5 to 0.6, is used when the structural design service life is 50 years. The value range is 0.6 to 0.

7. When the goaf is in a stable state, the settlement rate is slow (≤0.2mm / d and gradually decreases, with a cumulative settlement of <30mm over 6 consecutive months). The quasi-permanent value coefficient is calculated for a structural design service life of 25 years. The quasi-permanent value coefficient has a value range of 0.4 to 0.5 and a structural design service life of 50 years. The quasi-permanent coefficient has a value range of 0.5 to 0.6 and is used when the structural design service life is 100 years. The value range is 0.6 to 0.

7.

9. The building structure design method considering residual deformation in the goaf as described in claim 1, characterized in that, The design method for the internal forces of the superstructure is as follows: For horizontal members mainly subjected to bending: the internal forces at the support under the residual deformation condition of the goaf are compared with the internal forces under the seismic condition, and the envelope value is taken and combined with the internal forces under other conditions; the internal forces at the mid-span under the residual deformation condition of the goaf are treated as special live loads and combined with the internal forces under the seismic condition and other conditions. For vertical support components, the internal forces under the residual deformation condition of the goaf are treated as special live loads and combined with the internal forces under seismic conditions and other conditions.

10. The building structure design method considering residual deformation in the goaf as described in claim 9, characterized in that, When the residual deformation in the goaf has an adverse effect, the partial factor values ​​are as follows: When the goaf is in an active phase, the settlement rate is high (≥1.0 mm / d) and shows no signs of decay, with a partial factor... The value is 1.5; When the goaf is in the decay phase, the settlement rate is slow (≤1.0 mm / d and gradually decreases, with a cumulative settlement ≥30 mm over 6 consecutive months) and continues to decrease, with a partial factor... The value is 1.4; When the goaf is in a stable state, the settlement rate is slow (≤0.2mm / d and gradually decreases, with a cumulative settlement of <30mm over 6 consecutive months). (Partial factor) The value is 1.3; When the residual deformation effect in the goaf is favorable, the partial factor is taken as 0; The combination value coefficient of residual deformation in goaf is closely related to the goaf state. The more stable the goaf, the smaller the combination value coefficient. The value of the combination value coefficient of residual deformation in goaf is determined by the following. When the goaf is in an active phase, the settlement rate is high (≥1.0 mm / d) and shows no signs of decay, resulting in a high combination value coefficient. The value range is 0.9 to 1.0; When the goaf is in the decay phase, the settlement rate is slow (≤1.0 mm / d and gradually decreases, with a cumulative settlement ≥30 mm over 6 consecutive months) and continues to decline, resulting in a combination value coefficient. The value range is 0.7 to 0.9; When the goaf is in a stable state, the settlement rate is slow (≤0.2mm / d and gradually decreases, with a cumulative settlement of <30mm over 6 consecutive months). The combination value coefficient... The value range is 0.6 to 0.7.

Images