【摘要】 针对地震中遭受严重破坏,失去应急疏散安全通道作用,不能满足预期抗震设防要求的楼梯间,进行典型钢筋混凝土框架结构考虑和不考虑楼梯作用两种情况下,多遇地震作用的计算分析对比,考察楼梯对结构受力影响,并通过静力弹塑性分析探讨楼梯对框架结构屈服破坏机制的影响,分析钢筋混凝土框架结构现浇楼梯和预制楼梯破坏原因,并结合计算分析结果及楼梯设计方法,提出楼梯的改进设计建议。更多还原

【Abstract】 Staircases,critically important for egress and access during emergency events,suffered severe damages in recent earthquakes at home and abroad in reinforced concrete(RC) frame structures.Staircases,acting as the first line of defense in earthquake,firstly yielded and failed,and were out the action of emergency access,they could not meet the seismic performance objectives.To realize the objective of acting as safe access under strong earthquakes,the current Chinese seismic design code for buildings specifies special requirement on the design of staircase.The comparison of numerical analysis of a typical RC frame structure under frequent earthquakes between considering and neglecting the effect of staircases was performed to study the influence of staircases on the structural behavior.The effect of staircases on the yielding and failure mechanism of RC frame structures was investigated with nonlinear static analysis.Accordingly,the damage reasons for in-situ cast staircase and precast staircase were analyzed.Finally,some suggestions to improve design of staircases were proposed according to the analysis results and the current design method.更多还原