楼梯对多层RC框架结构抗震性能影响分析
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摘要
传统的钢筋混凝土(RC)框架结构设计在进行内力分析时,对楼梯做了简化处理。没有将楼梯构件作为结构的一部分参与整体计算,导致计算结果与结构实际受力状态有差异。为了探讨楼梯对框架结构抗震性能的影响,设计了两个多层RC典型框架。利用PKPM、SAP2000有限元分析软件进行了内力分析、模态分析。研究结果表明:楼梯会增加结构的抗侧刚度;动力作用下,考虑楼梯的影响,结构的剪力增加,最大水平位移减小,振型发生变化。
In traditional structure design,stairs are designed simplified during internal force analysis.The stairs are not involved in the overall calculation as part of the structure,which lead to the difference between the analysis results and the actual stress state of the structure.Two multi-storey RC typical frameworks are designed to investigate the impact of the stairs on the seismic performance of frame structures.Force and modal analysis are made by PKPM and SAP2000.The results show that: the stairs will increase the lateral stiffness of the structure; when stairs is considered undering dynamic loading,frame structure seismic shear increases,the maximum vertex horizontal displacement decreases,and structural vibration mode will change.
In traditional structure design,stairs are designed simplified during internal force analysis.The stairs are not involved in the overall calculation as part of the structure,which lead to the difference between the analysis results and the actual stress state of the structure.Two multi-storey RC typical frameworks are designed to investigate the impact of the stairs on the seismic performance of frame structures.Force and modal analysis are made by PKPM and SAP2000.The results show that: the stairs will increase the lateral stiffness of the structure; when stairs is considered undering dynamic loading,frame structure seismic shear increases,the maximum vertex horizontal displacement decreases,and structural vibration mode will change.
引文
[1]苏启旺,蔡宏儒,李力.从“汶川大地震”引发对板式楼梯设计的思考[J].四川建筑科学研究,2008,34(4):165-167.
[2]张望喜,易伟建,肖岩,等.“5·12”汶川地震灾区典型教学楼框架与楼梯共同工作性能[J].建筑科学与工程学报,2009,26(2):38-45.
[3]曹万林,庞国新,李云霄.带楼梯框架弹性层刚度的试验研究[J].世界地震工程,1996(2):29-32.
[4]Higgins C.Prefabricated steel stair performance under combined seismic and gravity loads[J].Journal of Structural EngineeringASCE,2009,135(2):122-129.
[5]Sang B K,Young H L,Andrew S,et al.Experimental assessment of vibration serviceability of stair systems[J].Journal of Constructional Steel Research,2008,64(2):253-259.
[6]GB 50011—2010建筑抗震设计规范(2010年版)[S].
[2]张望喜,易伟建,肖岩,等.“5·12”汶川地震灾区典型教学楼框架与楼梯共同工作性能[J].建筑科学与工程学报,2009,26(2):38-45.
[3]曹万林,庞国新,李云霄.带楼梯框架弹性层刚度的试验研究[J].世界地震工程,1996(2):29-32.
[4]Higgins C.Prefabricated steel stair performance under combined seismic and gravity loads[J].Journal of Structural EngineeringASCE,2009,135(2):122-129.
[5]Sang B K,Young H L,Andrew S,et al.Experimental assessment of vibration serviceability of stair systems[J].Journal of Constructional Steel Research,2008,64(2):253-259.
[6]GB 50011—2010建筑抗震设计规范(2010年版)[S].
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