中心支撑钢框架结构基于性能的塑性抗震设计

Performance-based plastic design method for steel concentrically braced frames

根据功能平衡原理,提出了一种中心支撑钢框架结构基于性能的塑性设计方法。预先选定目标侧移和屈服机制,根据功能平衡方程即可得到结构的设计基底剪力。采用塑性设计法设计支撑构件和节点以便达到预期的屈服机制和性能。采用此方法对一幢6层中心支撑钢框架结构进行了设计,然后采用动力时程分析法验证了该方法的可行性,为中心支撑钢框架结构基于性能的塑性抗震设计法提供了一定的依据。

A performance-based plastic design (PBPD) methodology for steel concentrically braced frames (CBFs) was presented here. The designed base shear was obtained based on work-energy balance equations using pre-selected target drift and yield mechanism. Plastic design was performed to design bracing members and connection nodes in order to achieve the expected yield mechanism and behavior. The method was applied to design a six-storey steel concentrically braced frame, and the feasibility of the method was validated with inelastic dynamic analyses. It was shown that the story drifts are well within the target values, thus to meet the desired performance requirements. The proposed method provided a basis for performance-based plastic design of steel concentrically braced frames.