钢筋混凝土框架结构楼梯震害分析与设计建议

蒋欢军;王斌 吕西林;

振动与冲击 ›› 2013, Vol. 32 ›› Issue (3) : 22-28.

PDF(2598 KB)
PDF(2598 KB)
振动与冲击 ›› 2013, Vol. 32 ›› Issue (3) : 22-28.
论文

钢筋混凝土框架结构楼梯震害分析与设计建议

  • 蒋欢军1,2 王斌1 吕西林1,2
作者信息 +

Seismic damage analysis and design suggestions for staircases in RC frame structures

  • JIANG Huan-jun1,2, WANG Bin1, LU Xi-lin1,2
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摘要

楼梯本应当建成为突发事件的应急疏散安全通道,但是近年来国内外几次地震中却发现钢筋混凝土框架结构的楼梯间发生了严重的破坏。楼梯构件在地震中充当了第一道抗震防线,首先发生屈服破坏,失去了应急疏散安全通道的作用,不能满足预期的抗震设防要求。我国现行建筑抗震设计规范对楼梯的设计提出了特别要求,使其能够实现在大震下具有安全避难通道的目标。对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进行多遇地震作用下的计算分析对比,考察楼梯对结构受力的影响,并通过静力弹塑性分析探讨楼梯对框架结构的屈服破坏机制的影响,分析了钢筋混凝土框架结构现浇楼梯和预制楼梯在地震中破坏的原因。最后,结合计算分析结果及目前有关楼梯的设计方法,提出了楼梯的改进设计建议。

Abstract

Staircases, critically important for egress and access during emergency events, suffered severe damages in recent earthquakes at home and abroad in reinforced concrete frame structures. Staircases, acting as the first line of defense in the earthquake, firstly yielded and failed, and were out the action of emergency access, which 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 reinforced concrete frame structure under frequent earthquakes between considering and neglecting the effect of staircases is carried out to study the influence of staircases on the structural behavior. The effect of staircases on the yielding and failure mechanism of the structure is investigated by nonlinear static analysis. Accordingly, the reasons of the damage suffered by the in-situ cast staircase and precast staircase are analyzed. Finally, some suggestions to improve the design of staircases are proposed according to the analytic results and the current design method.

关键词

汶川地震 / 钢筋混凝土框架结构 / 现浇楼梯 / 预制楼梯 / 抗震性能 / 屈服破坏机制

Key words

Wenchuan earthquake / reinforced concrete frame structure / in-situ cast staircase / precast staircase / seismic performance / yielding and failure mechanism

引用本文

导出引用
蒋欢军;王斌 吕西林;. 钢筋混凝土框架结构楼梯震害分析与设计建议[J]. 振动与冲击, 2013, 32(3): 22-28
JIANG Huan-jun;WANG Bin;LU Xi-lin;. Seismic damage analysis and design suggestions for staircases in RC frame structures[J]. Journal of Vibration and Shock, 2013, 32(3): 22-28

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