CN-121997436-A - Design method and design device for building toughening diagonal bracing system

CN121997436ACN 121997436 ACN121997436 ACN 121997436ACN-121997436-A

Abstract

The application relates to the technical field of building support structures, and provides a design method and a design device of a building toughening diagonal bracing system. The design method comprises the steps of constructing a building toughening diagonal bracing system model, determining an anti-seismic design scheme of the building toughening diagonal bracing system based on strength under a preset failure mode according to the geometric characteristics and geometric parameters of the building toughening diagonal bracing system model and the relation between the shearing bearing capacity of a shearing damper and the buckling bearing capacity of the cross diagonal bracing, determining a temperature design scheme of the building toughening diagonal bracing system based on out-of-plane deformation according to the geometric characteristics and the out-of-plane deformation mode of the building toughening diagonal bracing system model, and rechecking the out-of-plane deformation space of the cross diagonal bracing under the lowest temperature and whether the energy consumption and the failure mode under the highest service temperature meet corresponding preset requirements. Through carrying out antidetonation design scheme and design scheme based on the temperature, make the building toughening bracing system of output can ensure to satisfy the service safety in high-intensity high-altitude area.

Inventors

LIN JINGCONG
HU HESONG
WU ZINAN
LIU CHUNLIN
HAN XIAOLEI
ZHOU ZHIGUO
CHEN HANG
DUAN ZHENYU

Assignees

广州市建筑科学研究院集团有限公司
广州建设工程质量安全检测中心有限公司

Dates

Publication Date: 20260508
Application Date: 20260302

Claims (10)

1. A design method of a building toughening diagonal bracing system is characterized in that the building toughening diagonal bracing system is an out-of-plane deformable diagonal bracing and comprises a bearing component, an energy consumption component and a single plane frame, wherein the bearing component adopts a cross diagonal bracing, the cross diagonal bracing comprises two upper diagonal bracing and two lower diagonal bracing, the energy consumption component adopts a shearing damper, the shearing damper is located at the junction of the two upper diagonal bracing and the two lower diagonal bracing, the single plane frame comprises a frame column and a frame beam, and the design method comprises the following steps: S1, building a building toughening diagonal system model; S2, determining an anti-seismic design scheme of the building toughening diagonal brace system based on strength under a preset failure mode according to the geometric characteristics and geometric parameters of the building toughening diagonal brace system model and the relation between the shearing bearing capacity of the shearing damper and the buckling bearing capacity of the cross diagonal brace so that the shearing damper consumes energy fully before the cross diagonal brace fails, wherein the geometric parameters comprise the length dimension of the upper diagonal brace and the lower diagonal brace and the out-of-plane distance of the shearing damper; S3, determining a temperature design scheme of the building toughening diagonal system based on out-of-plane deformation according to the geometric characteristics and the out-of-plane deformation mode of the building toughening diagonal system model, wherein the temperature design scheme comprises the out-of-plane displacement of the crossed diagonal and the design of the out-of-plane angle after deformation; S4, checking whether the out-of-plane deformation space of the crossed diagonal brace at the lowest service temperature is sufficient, and whether the energy consumption and failure mode of the shear damper at the highest service temperature are web shear energy consumption and web shear failure of the shear damper, if so, outputting the building toughening diagonal brace system model, and if not, re-determining the anti-seismic design scheme and/or the temperature design scheme.
2. The method of designing a building toughening diagonal brace system according to claim 1, wherein the preset failure mode comprises a web shear failure of the shear damper.
3. The method for designing a building toughening diagonal system according to claim 2, wherein step S2 comprises: confirming the critical thickness of a web plate of the shear damper according to the geometric characteristics and geometric parameters of the building toughening diagonal bracing system model; And confirming the design thickness of the web of the shear damper according to the critical thickness of the web and the preset failure mode.
4. The method of designing a building toughening diagonal brace system according to claim 3, wherein identifying the critical web thickness of the shear damper based on the geometric features and geometric parameters of the building toughening diagonal brace system model comprises: According to the geometric characteristics and geometric parameters of the building toughening diagonal system model, determining the relation between the axial force requirements of the upper diagonal and the lower diagonal and the shearing force requirement of the shearing damper: , Wherein, the For the axial force demand of the upper diagonal braces, For the axial force demand of the lower diagonal braces, For the shear force requirement of the shear type damper, For the length of the upper diagonal strut, For the length of the lower diagonal brace, The height of the diagonal bracing system is toughened for the building, Is the height at the junction of the upper diagonal brace and the lower diagonal brace; Determining the shearing force requirement of the shearing damper according to the relation between the axial force requirement and the buckling bearing capacity of the crossed diagonal brace in the buckling critical state and the relation between the buckling bearing capacity of the crossed diagonal brace and the shearing force requirement of the shearing damper : , Wherein, the For the buckling load-bearing capacity of the upper diagonal brace, For the buckling load-bearing capacity of the lower diagonal braces, In the time of buckling of the upper diagonal brace, Buckling the lower diagonal brace; determining the shearing bearing capacity of the shearing damper according to the stress characteristics of the shearing damper mainly based on web shearing energy consumption : , wherein, For the ultimate shear strength of the web of the shear damper, For the thickness of the web of the shear damper, A height of a web of the shear damper; determining the critical thickness of the web according to the critical energy consumption mode of the building toughening diagonal bracing system In the critical energy consumption mode Critical thickness of the web The calculation formula of (2) is as follows: , wherein, , , For the upper diagonal strut as a stability factor of the axial compression member, For the lower diagonal brace as a stability factor of the axial compression member, For the buckling strength of the upper diagonal brace, For the cross-sectional area of the upper diagonal strut, For the radius of gyration of the upper diagonal brace, For the buckling strength of the lower diagonal brace, For the cross-sectional area of the lower diagonal brace, Is the radius of gyration of the lower diagonal brace.
5. The method of designing a building toughening diagonal brace system according to claim 3 or 4, wherein the out-of-plane deformation mode comprises a thermal expansion outward deformation mode and a cold contraction inward deformation mode; Step S3, including: According to the thermal expansion physical characteristics of the material of the crossed diagonal brace, the length of the material after out-of-plane deformation is calculated according to the following calculation formula: , , Wherein, the For the length of the upper diagonal brace after out-of-plane deformation, For the length of the lower diagonal brace after out-of-plane deformation, In order to have a coefficient of linear expansion, Is the magnitude of the change in ambient temperature from the initial temperature; Calculating the out-of-plane distance of the shear damper after out-of-plane deformation according to the geometric relationship between the out-of-plane deformation of the building toughening diagonal bracing system and the out-of-plane deformation, wherein the expression of the geometric relationship between the out-of-plane deformation of the building toughening diagonal bracing system and the out-of-plane deformation is as follows: , , wherein, For the out-of-plane distance of the shear damper prior to out-of-plane deformation, , For the distance between the junction and the frame column, For the out-of-plane distance of the shear type damper near one end of the upper diagonal brace after out-of-plane deformation, For the out-of-plane distance of the shear type damper near one end of the lower diagonal brace after out-of-plane deformation, And The calculation formula of (2) is as follows: , ; According to the geometrical relationship between the out-of-plane deformation and the out-of-plane deformation of the building toughening diagonal bracing system, calculating the out-of-plane displacement and the out-of-plane angle of the cross diagonal bracing after deformation, and the out-of-plane displacement of the upper diagonal bracing of the cross diagonal bracing Out-of-plane displacement of lower diagonal braces External angle after deformation of upper diagonal brace External angle of deformed lower diagonal brace The calculation formulas of (a) are respectively as follows: , , , 。
6. The method for designing a toughening diagonal brace system according to claim 5, wherein in step S4, checking whether the out-of-plane deformation space of the crossed diagonal brace at the minimum service temperature is sufficient comprises: According to the out-of-plane displacement of the upper diagonal bracing And the lower diagonal bracing out-of-plane displacement Calculating the out-of-plane displacement of the web center of the shear damper : ; At the minimum service temperature, verify If so, the out-of-plane deformation space of the crossed diagonal bracing at the lowest service temperature is sufficient; In step S4, rechecking whether the energy consumption and failure mode of the shear damper at the highest service temperature are web shear energy consumption and web shear failure of the shear damper, including: Determining the critical thickness of the web plate at the highest service temperature according to the out-of-plane configuration angle of the building toughening diagonal system at the highest service temperature and the lengths of the upper diagonal and the lower diagonal; checking whether the designed thickness of the web plate of the shear damper is smaller than the critical thickness of the web plate at the highest service temperature.
7. The method of designing a building toughening diagonal system according to claim 1, wherein the method of designing further comprises: And S5, applying the building toughening diagonal system model output in the step S4 to the building model to be supported, and carrying out structural performance analysis and rechecking on the whole structure.
8. The method for designing a toughening diagonal bracing system according to claim 7, wherein in the step S5, the structural performance analysis and check includes structural performance analysis and check under the action of temperature and structural performance analysis and check under the action of earthquake; The structural performance analysis rechecking under the action of temperature comprises rechecking the out-of-plane deformation capacity of the crossed diagonal brace under the temperature change and rechecking whether the least adverse internal force of the crossed diagonal brace, the shearing damper and the single-frame plane frame under the temperature change exceeds an allowable value calculated according to the material strength; The analysis and rechecking of the structural performance under the earthquake action comprises rechecking of the performance state of the integral structure by adopting a component-based performance evaluation method so that the earthquake resistance of the integral structure meets a performance target.
9. The method for designing a building toughening diagonal brace system according to claim 8, wherein the rechecking the performance state of the overall structure by adopting a component-based performance evaluation method comprises: Comprehensively determining a structural earthquake resistance target according to the type of earthquake fortification of the integral structure, the structural importance level, the structural complexity and the performance requirements of owners; determining the earthquake resistance level under different earthquake levels according to the earthquake resistance target and the earthquake level; determining the importance level of the component according to the earthquake resistance level and the component performance type, and selecting a component design and rechecking method; And according to the importance level of the component, adopting the component bearing capacity or the component displacement angle limit value or the component material strain limit value as an evaluation index of the component performance state, and comparing the component maximum displacement angle or the material maximum strain with the evaluation index to judge the performance state of the integral structure.
10. A design device of a building toughening diagonal bracing system is characterized in that the building toughening diagonal bracing system is an out-of-plane deformable diagonal bracing and comprises a bearing component, an energy consumption component and a single plane frame, wherein the bearing component adopts a cross diagonal bracing, the cross diagonal bracing comprises two upper diagonal bracing and two lower diagonal bracing, the energy consumption component adopts a shearing damper, the shearing damper is located at the junction of the two upper diagonal bracing and the two lower diagonal bracing, the single plane frame comprises a frame column and a frame beam, and the design device comprises: the model building module is used for building a building toughening diagonal system model; The system comprises a building toughening diagonal brace system model, an earthquake-resistant design module and an earthquake-resistant control module, wherein the building toughening diagonal brace system model is used for determining an earthquake-resistant design scheme based on strength of the building toughening diagonal brace system in a preset failure mode according to the geometric characteristics and geometric parameters of the building toughening diagonal brace system model and the relation between the shearing bearing capacity of the shearing type damper and the buckling bearing capacity of the cross diagonal brace so that the shearing type damper consumes energy fully before the cross diagonal brace fails; The temperature-based design module is used for determining a temperature design scheme of the building toughening diagonal system based on out-of-plane deformation according to the geometric characteristics and the out-of-plane deformation mode of the building toughening diagonal system model, wherein the temperature design scheme comprises the out-of-plane displacement of the crossed diagonal and the design of the out-of-plane angle after deformation; The design rechecking module is used for rechecking whether the out-of-plane deformation space of the crossed diagonal brace at the lowest service temperature is sufficient, and whether the energy consumption and failure mode of the shear damper at the highest service temperature are web shear energy consumption and web shear failure of the shear damper; And applying a rechecking module to apply the building toughening diagonal system model output by the design composite module to the building model to be supported, and carrying out structural performance analysis rechecking on the whole structure.

Description

Design method and design device for building toughening diagonal bracing system Technical Field The application relates to the technical field of building support structure design, in particular to a design method and a design device of a building toughening diagonal bracing system. Background In high intensity seismic areas of octaves and above, building structures require shock absorbing or shock insulating designs to mitigate component damage caused by strong seismic action. In the process of vibration damping design, energy consumption devices (such as dampers) are generally arranged on certain parts or components of a building structure, and a large amount of earthquake capacity is dissipated by utilizing plastic deformation of the dampers under the earthquake action, so that earthquake response of the building structure is reduced, and damage to the components is reduced. For example, steel support systems containing energy consuming devices are used in some engineering projects to reduce the seismic response of building structures. In order to avoid the steel support system occupying the indoor space, the steel support system is arranged at the periphery of the building to be supported in some engineering projects, so that the integral anti-seismic effect of the building structure can be improved, and the indoor space can be ensured. But some high intensity areas are also high altitude areas, such as northwest plateau areas. Due to the unique extreme temperature environment of high altitude areas and the temperature sensitivity of steel, the service safety of the steel support system at the periphery of the building is easily influenced by the environmental temperature. For example, under temperature changes, the steel support system is prone to deformation, so that a temperature stress field is generated in the support system, and service safety of the steel support system is affected. Therefore, a design method of the steel support system is required to be provided to improve the service safety of the steel support system in high-intensity high-altitude areas. Disclosure of Invention The application provides a design method and a design device of a building toughening diagonal bracing system, which are used for solving the technical problem that the service safety of a supporting system in a high-intensity high-altitude area is easily influenced by coupling of earthquake intensity and environmental temperature in the prior art. In order to solve the problems, the application provides a design method of a building toughening diagonal bracing system, which is an out-of-plane deformable diagonal bracing and comprises a bearing component, an energy consumption component and a single-frame planar frame, wherein the bearing component adopts a cross diagonal bracing, the cross diagonal bracing comprises two upper diagonal bracing and two lower diagonal bracing, the energy consumption component adopts a shearing damper, the shearing damper is positioned at the junction of the two upper diagonal bracing and the two lower diagonal bracing, the single-frame planar frame comprises a frame column and a frame beam, and the design method comprises the following steps: S1, building a building toughening diagonal system model; S2, determining an anti-seismic design scheme of the building toughening diagonal brace system based on strength under a preset failure mode according to the geometric characteristics and geometric parameters of the building toughening diagonal brace system model and the relation between the shearing bearing capacity of the shearing damper and the buckling bearing capacity of the cross diagonal brace so that the shearing damper consumes energy fully before the cross diagonal brace fails, wherein the geometric parameters comprise the length dimension of the upper diagonal brace and the lower diagonal brace and the out-of-plane distance of the shearing damper; S3, determining a temperature design scheme of the building toughening diagonal system based on out-of-plane deformation according to the geometric characteristics and the out-of-plane deformation mode of the building toughening diagonal system model, wherein the temperature design scheme comprises the out-of-plane displacement of the crossed diagonal and the design of the out-of-plane angle after deformation; S4, checking whether the out-of-plane deformation space of the crossed diagonal brace at the lowest service temperature is sufficient, and whether the energy consumption and failure mode of the shear damper at the highest service temperature are web shear energy consumption and web shear failure of the shear damper, if so, outputting the building toughening diagonal brace system model, and if not, re-determining the anti-seismic design scheme and/or the temperature design scheme. The application also provides a design device of the building toughening diagonal bracing system, which is an out-of-plane deformable diagonal bracing and