摘要
通过对角撑框架屈服时序的分析发现,合理设计的角撑框架可以保护梁柱节点在地震作用下免受或延迟破坏,实现较优的框架屈服时序,但等截面直线角撑难以满足其对角撑承载力和刚度进行相对独立设计的要求。为此提出弧形角撑的方案,通过理论分析和有限元模型计算,验证在一定范围内调节角撑弧度与截面,能够实现其名义轴向刚度与屈服承载力相对独立的设计,满足角撑框架屈服时序的要求。
Through the analysis of yielding sequence of knee braced moment frames（ KBMFs）,it was found that the failure of beam-to-column joints could be prevented or delayed with the help of rationally designed knee braces. However,it was difficult to design the straight knee brace with equal section meeting the separated requirements of stiffness and strength. Thus the configuration of a curved brace was figured out. With the same yielding strength,curved knee braces could provide better post-buckling compressive capacity and more options of initial stiffness than straight braces. The results of FEM analysis showed that the frame with properly designed knee braces could satisfy the requirements of yielding sequence.
出处
《钢结构》
北大核心
2016年第6期33-39,共7页
Steel Construction
基金
科技部国家重点实验室基础研究资助项目(SLDRCE14-A-03)
关键词
角撑框架
弧形构件
抗震性能
屈服时序
数值研究
knee braced moment frames
curved member
seismic behavior
yielding sequence
numerical analysis
