摘要
传统的钢结构在地震中通过梁柱构件的塑性变形耗散地震能量,导致地震后可能产生较大的残余变形,难以修复,具有自复位能力的新型建筑结构可以有效解决此问题。在国内外关于自复位新型钢结构体系研究成果的基础上,对其体系结构与受力特点进行总结与分析:该类节点的梁柱间通过角钢栓接,沿梁长布置高强预应力钢绞线;通过对钢绞线施加预应力将梁柱压紧,使节点具备足够的抗弯刚度以满足正常使用情况下的功能性要求,钢绞线同时提供回复力使节点在震后具有自复位的能力;震中通过角钢的塑性破坏来耗能,而梁柱等主体构件则保持弹性;由于主体构件没有受到破坏,而且节点在预应力作用下自动回复原位,故震后仅替换角钢便可恢复节点至无损状态。研究表明,自复位钢结构体系具有有效性和工程可行性。
Traditional steel moment frames use welded beam-column connections,which are susceptible to brittle fracture and commonly have large residual deformation after the earthquakes.This paper summarizes the recent research on the structural system,generalizes characteristics of self-centering steel structures as follows: A novel steel structure system having the capacity of self-centering and energy dissipation can solve such problems effectively.The new connection uses bolted top and seat angles,and post-tensioned(PT) high-strength steel strands running along the beam,the PT strands tie the beam flanges on the column flange to resist moment and provide self-centering force.During the earthquake,the columns and beams remain elastic while the angles sustain inelastic deformations for energy dissipation.After the earthquake,the connections have zero deformation.They can be restored to the original status by simply replacing the angles.The research suggests that the novel structural system is more effective and has higher potential for engineering applications.
出处
《土木工程学报》
EI
CSCD
北大核心
2010年第S1期403-410,共8页
China Civil Engineering Journal
基金
国家自然科学基金面上项目(50808107)
国家自然科学基金重点项目(9081502)
关键词
钢结构
自复位
耗能
框架
节点
steel structure
self-centering
energy dissipation
frame
connection
