隔震支座弯剪耦合及二阶效应的影响研究
引用文献：
乔保娟 杨志勇 肖从真 邱海. 隔震支座弯剪耦合及二阶效应的影响研究[J]. 建筑结构，2023，48（04）：128-134，127.
QIAO Baojuan YANG Zhiyong XIAO Congzhen QIU Hai. Study on influence of bending-shear coupling and second-order effect of seismic isolation bearing[J]. Building Structure，2023,48（04）：128-134，127.
摘要：按照《建筑隔震设计标准》(GB/T 51408—2021)规定，隔震层下部结构的承载力验算，应考虑上部结构传来的轴力、弯矩、水平剪力以及由隔震层水平变形产生的附加弯矩。从Timoshenko梁单元刚度矩阵出发，推导了考虑弯剪耦合的连接单元刚度矩阵及非线性内力算法；开发了考虑弯剪耦合及二阶效应的隔震支座单元，通过典型算例分析了弯剪耦合及二阶效应对支墩弯矩的影响。以实际隔震结构为例，分析了隔震支座弯剪耦合及二阶效应对隔震支座相连构件内力、配筋及结构整体指标的影响。结果表明，考虑隔震支座弯剪耦合及二阶效应对隔震支座上支墩、下支墩及与其相连梁的内力及配筋影响显著，但对隔震结构层间位移角、层间剪力及隔震支座耗能的影响较小。在进行隔震层设计时，建议采用考虑弯剪耦合及二阶效应的隔震支座单元进行隔震层的直接分析设计。
关键词：隔震支座；Timoshenko梁单元；弯剪耦合效应；二阶效应；直接分析设计；
基金：中国建筑科学研究院有限公司青年科研基金项目资助(20210122331030008)。
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Study on influence of bending-shear coupling and second-order effect of seismic isolation bearing
Abstract: According to the Standard for seismic isolation design of building(GB/T 51408—2021), the axial force, bending moment, horizontal shear force from the upper structure as well as the additional bending moment caused by horizontal deformation of the seismic isolation layer should be taken into account in checking the bearing capacity of the lower structure of the seismic isolation layer. Based on the stiffness matrix of Timoshenko beam element, the stiffness matrix of connection element and nonlinear internal force algorithm considering bending shear coupling were derived. A seismic isolation bearing element was developed considering the bending-shear coupling and second-order effect, and the influence of the bending-shear coupling and second-order effect on the bending moment of the pier was analyzed through typical example. Taking an actual seismic isolation structure as an example, the influence of the bending-shear coupling and second-order effect of the seismic isolation bearing on the overall structural indicators, internal force and reinforcement of the structural members connected with the seismic isolation were analyzed. The results show that the bending-shear coupling and second-order effect of the seismic isolation bearing have significant effects on the internal force and reinforcement of the upper and lower piers and the connected beams of the seismic isolation bearing, but tiny effects on the story drift ratio, story shear force and energy dissipation of the seismic isolation bearing. When designing the seismic isolation layer, it is recommended to use the seismic isolation bearing element considering the bending-shear coupling and second-order effect for direct analysis and design of the seismic isolation layer.
Keywords: seismic isolation bearing; Timoshenko beam element; bending-shear coupling effect; second-order effect; direct analysis and design
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