循环荷载作用下空腹式交错桁架钢结构抗震性能试验研究  

Experimental study on seismic behavior of vierendeel staggered truss steel structures under cyclic load

作　　者：冉红东[1] 苏明周[1] 李虎 胡天兵 申林 

机构地区：[1]西安建筑科技大学结构与抗震教育部重点实验室,陕西西安710055 [2]陕西省电力设计院,陕西西安710054 [3]中国建筑标准设计研究院,北京100044

出　　处：《建筑结构学报》2008年第6期91-98,共8页Journal of Building Structures

基　　金：科技部科研院所专项基金项目(2004EG131165);陕西省自然科学基金项目(2001C31)

摘　　要：为研究空腹式交错桁架结构体系的抗震性能,进行了1个5层空腹式交错桁架钢结构1/3缩尺模型试验,研究了该结构体系在循环荷载作用下的抗震性能和破坏机理,并从滞回性能、刚度退化、结构延性、耗能能力及破坏模式等方面评价该结构体系的抗震性能。试验及分析结果表明:该结构具有承载能力高、变形能力较强、耗能能力好等优点,但其侧向刚度偏弱,各层层间位移延性角差别较大,结构沿高度方向侧向刚度分布不均匀。应力测试结果表明,该结构塑性铰开始形成于桁架腹杆,然后是桁架弦杆,最后在柱中形成塑性铰,地震能量主要通过桁架耗散,其破坏属于梁铰机制,满足强柱弱梁的抗震要求。Based on the experimental result of a 1/3 scale vierendeel staggered truss frame steel structure model under cyclic load, the seismic behavior and failure mechanism of vierendeel staggered truss frame steel structure were studied, and the seismic behaviors were evaluated by the hysteretic behavior, ductility, energy dissipation and rigidity degeneration. The study revealed that the vierendeel staggered truss steel structures had the advantages in bearing capacity, ductility, deformability and energy dissipation, but the lateral rigidity was weak and non-uniform along its vertical layout. The stress measurement showed that the plastic hinge formed in the web members of the truss firstly, then, in the chord members of the truss, and finally the plastic hinge formed in the lower end of the bottom column, earthquake energy mostly dissipated by the truss members, and the failure mechanism of the vierendeel staggered truss steel structures was the beam hinges failure mechanism, which meet the requirements of current code for seismic design of building.

关 键 词：空腹式交错桁架钢结构 试验研究 抗震性能 破坏机理 

分 类 号：TU973.13[建筑科学—结构工程] TU317.1