【摘要】 节点刚度对钢结构的抗震性能有很大的影响。基于模态推覆分析MPA方法,初步探讨了节点半刚性对钢交错桁架在大震作用下抗震性能的影响。运用通用有限元软件SAP2000建立了平面模型,并修改节点塑性铰的属性和初始刚度来模拟钢交错桁架的半刚性节点,对比发现采用了半刚性节点的钢交错桁架,相对于完全刚接的情况,其基本自振周期、楼层侧移和层间位移角明显增大,塑性铰分布较为分散,数量减少,在大震下的耗能能力明显改善。更多还原

【Abstract】 Joint stiffness has a significant influence on the seismic performance of steel structures.Based on the MPA(Modal Pushover Analysis)method,the effect of semi-rigid connections on the seismic performance of staggered steel trusses under severe earthquakes is discussed in this paper.By using the finite element software SAP2000,a numerical model is established.The analysis results show that comparing to fully rigid connections,staggered steel truss with semi-rigid connections has a much larger natural vibration period,bigger lateral displacement and bigger inter-story drifts,while the number of plastic hinges is reduced and the distribution is more dispersed,which shows that the energy dissipation capacity of semi-rigidly staggered steel truss is improved significantly under severe earthquakes.更多还原