大震作用下板式楼梯框架弹塑性地震反应分析
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摘要
有关大震作用下楼梯与框架共同工作方面的研究还很少,采用结构有限元软件Midas/Gen,对一个5层钢筋混凝土现浇板式楼梯框架办公楼模型进行了弹塑性分析,对模型在大震作用下的受力情况进行了详细研究。通过对楼梯和框架共同工作性能的研究,并与不考虑楼梯影响的框架的工作性能进行了对比,分析了板式楼梯框架的失效机制和受力特点,指出了楼梯与框架共同工作时的受力不利部位。结果表明:楼梯相较于框架梁柱是模型的薄弱部位;模型的失效是从楼梯发展到框架,由下层发展到上层。最后根据模型的失效机制特点提出了相应的抗震措施。
The researches on performance of frames with stairs under severe earthquake are scarce.In this paper,a time-history analysis of a five-floor reinforced concrete frame structure with cranked slab stairs was carried out using the finite element software Midas/Gen for model structure.By comparing the seismic responses of frame with and without stairs,we carefully researched the failure mechanism and force characteristics of the frame with cranked slab frame.The results show that stairs is a weak part,the stress in stairs is bigger than that in frame;the failure of the model begins from the stairs and develops from the lower floor up.Finally,based on the failure mechanism,corresponding seismic measures were suggested.
The researches on performance of frames with stairs under severe earthquake are scarce.In this paper,a time-history analysis of a five-floor reinforced concrete frame structure with cranked slab stairs was carried out using the finite element software Midas/Gen for model structure.By comparing the seismic responses of frame with and without stairs,we carefully researched the failure mechanism and force characteristics of the frame with cranked slab frame.The results show that stairs is a weak part,the stress in stairs is bigger than that in frame;the failure of the model begins from the stairs and develops from the lower floor up.Finally,based on the failure mechanism,corresponding seismic measures were suggested.
引文
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[3]冯远,吴小宾,李从春,等.现浇楼梯对框架结构的抗震影响分析与设计建议[J].土木工程学报,2010,43(10):53-62.Feng Yuan,Wu Xiaobin,Li Congchun,et al.A study of the earthquake-resistance performance of frames with staircases[J].China Civil Engi-neering Journal,2010,43(10):53-62.
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[5]樊长林,张善元,路国运.钢筋混凝土框架刚塑性抗震设计方法研究[J].世界地震工程,2009,25(3):67-73.Fan Changlin,Zhang Shanyuan,LU Guoyun.Study on rigid-plastic seismic design of reinforced concrete frame structures[J].World EarthquakeEngineering,2009,25(3):67-73.
[6]GB50011-2001,建筑抗震设计规范[S].GB50011-2001,Code for seismic design of buildings[S].
[2]王威,薛建阳,章红梅,等.框架结构在汶川5.12大地震中的震害分析及抗震启示[J].世界地震工程,2009,25(4):131-135.Wang Wei,Xue Jianyang,Zhang Hongmei et al.Seismic design and lessons learnt from the earthquake disaster of frame structures in 5.12 Wen-chuan earthquake[J].World Earthquake Engineering,2009,25(4):131-135.
[3]冯远,吴小宾,李从春,等.现浇楼梯对框架结构的抗震影响分析与设计建议[J].土木工程学报,2010,43(10):53-62.Feng Yuan,Wu Xiaobin,Li Congchun,et al.A study of the earthquake-resistance performance of frames with staircases[J].China Civil Engi-neering Journal,2010,43(10):53-62.
[4]田志鹏.多遇及罕遇地震作用下带板式楼梯多层钢筋混凝土框架结构地震反应研究[D].成都:四川大学,2010.
[5]樊长林,张善元,路国运.钢筋混凝土框架刚塑性抗震设计方法研究[J].世界地震工程,2009,25(3):67-73.Fan Changlin,Zhang Shanyuan,LU Guoyun.Study on rigid-plastic seismic design of reinforced concrete frame structures[J].World EarthquakeEngineering,2009,25(3):67-73.
[6]GB50011-2001,建筑抗震设计规范[S].GB50011-2001,Code for seismic design of buildings[S].
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