（广州大学减震控制与结构安全国家重点实验室(培育)，  广州 510405）

［摘要］对隔震结构提出以中震弹性为基准设防目标的性能化设计方法，并通过引入结构性能系数φ调整同一震级下不同性能设防目标之间的关系；提出通过迭代计算确定隔震层的水平等效刚度和等效阻尼比的方法，并通过两种不同的初值进行迭代方法的验证；对比了隔震结构采用直接设计法和传统的两阶段分部设计法的内力和配筋结果。研究表明，提出的设计方法可通过引入结构性能系数φ调整同一震级下不同地震作用效应的组合以适应不同的性能设计目标；相比较传统的两阶段分部设计法，上部结构随隔震层的平动改变了构件之间的地震作用分配方式，减轻了中梁的受扭现象，使上部构件的受力更加合理。

［关键词］隔震结构； 等效刚度； 等效阻尼比； 结构性能系数； 直接设计法

中图分类号：TU398-7文献标识码：A文章编号：1002-848X(2019)09-0071-06

Study on performance-based direct design method for seismic isolation structure

Teng Xiaofei, Tan Ping, Zhou Linli, Jin Jianmin, Liu Yanhui

(State Key Laboratory for Seismic Control and Structural Safety (Cultivation Base), Guangzhou University, Guangzhou 510405, China)

Abstract:Performance-based direct design method for seismic isolated structure under the basic fortification target of keeping elasticity under fortification earthquake was proposed, and the relationship of different performance targets was adjusted by introducing the structural performance coefficient φ under the same seismic magnitude. A method for determining the horizontal equivalent stiffness and the equivalent damping ratio of the isolation layer by iterative calculation was proposed, and the iterative method was verified using two different initial values. The results of internal forces and reinforcement of isolated structures were compared using direct design method and traditional two-stage partial design method. The research shows that the proposed design method can adjust the combination of different seismic effects under the same magnitude by introducing the structural performance coefficient φ  to adapt to different performance design targets. Compared with the traditional two-stage partial design method, the super structure changes the distribution of seismic action among the members with the horizontal displacement of the isolation layer, which alleviates the torsion phenomenon of the middle beam, and makes the mechanism of the superstructure more reasonable.

Keywords:isolation structure; equivalent stiffness; equivalent damping ratio; structural performance coefficient; direct design method