基于连续倒塌工况下间隔空腹桁架式钢框架受力性能分析

ANALYSIS OF STEEL STAGGERED VIERENDEEL TRUSS FRAME BASED ON THE PROGRESSIVE COLLAPSE

为提高多层大跨钢框架结构的抗连续倒塌性能,将空腹桁架结构作为转换层的概念应用到结构抗连续倒塌设计中,提出间隔空腹桁架式框架结构,并对其抗倒塌性能进行分析。其中分别选取等节间间隔空腹桁架式框架结构和混合式间隔空腹桁架式框架结构,使用SAP 2000对其进行非线性静力分析和非线性动力分析,并将其结果与普通框架结构结果进行对比。结果分析表明,间隔空腹桁架式框架结构可以视为在纯框架中加入了刚性隔离带,使得结构的刚度增大,可更好地抵抗局部破坏引起的动力响应,提高了结构的鲁棒性,其中混合式间隔空腹桁架式框架结构的性能要优于等节间式结构。

In order to improve the progressive collapse resistance performance of long-span multi-story steel frame,the concept that employ steel staggered vierendeel truss frame as transfer story was used in the analysis of progressive collapse resistance performance,and this paper introduced the staggered vierendeel truss frames while the behaviors of them were analyzed.The comparative analysis of nonlinear static analysis and nonlinear dynamic analysis between equal-spacing and hybrid staggered vierendeel truss frames was carried out by SAP 2000.The results showed that vierendeel staggered truss frame could be regarded as a bare frame structure added rigid isolation belt,which could improve stiffness and robustness,thus avoide the dynamic response caused by local failure.The performance of hybrid staggered vierendeel truss frame is superior to equal-spacing staggered vierendeel truss frame.