钢框架-混凝土抗侧力结构的抗震性能研究
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摘要
在双重抗侧力结构体系中,地震作用主要由支撑框架或剪力墙等抗侧力结构承受,框架则主要承受竖向荷载,但是对框架的水平抗力也有具体要求。我国规范和美国规范对钢框架-剪力墙结构中框架应该承担的剪力有不同的规定,并且给出相应的抗震校核方法。此外,人们需要了解在混合结构中减少柱的数量对结构抗震性能的影响。为此,本文进行了2种钢-混凝土混合结构地震响应的有限元分析,并且考虑了柱距的变化,得到了轴压比的变化规律,对由两国抗震校核方法的计算结果进行了对比,提出了相关的设计建议。
For the steel frame-concrete shear resistant structures,the steel and concrete components work coordinately so that can provide the lateral stiffness.The vertical load is supported by the steel frame.The majority of the shear force is borne by the lateral resistant system,for example,the bracing frame or the concrete shear wall and so on,and the steel frame could bear only a portion of that.Chinese Code and American Code give different stipulations for the shear force borne by the steel frame and the different methods of the seismic analysis.In addition,it is needed to know what influence on the seismic characteristics of the composite structure will exert,if the columns of the structure are decreased.In this paper,the seismic characteristics of two kinds of steel frame-concrete shear resistant structures are investigated.Finite element method is applied in the seismic response analyses,and the change of the column spacing is taken into account.The change rule of the axial stress ratio is found.And the computational results according to Chinese Code are compared with that of American method.At last,some design advices are given.
For the steel frame-concrete shear resistant structures,the steel and concrete components work coordinately so that can provide the lateral stiffness.The vertical load is supported by the steel frame.The majority of the shear force is borne by the lateral resistant system,for example,the bracing frame or the concrete shear wall and so on,and the steel frame could bear only a portion of that.Chinese Code and American Code give different stipulations for the shear force borne by the steel frame and the different methods of the seismic analysis.In addition,it is needed to know what influence on the seismic characteristics of the composite structure will exert,if the columns of the structure are decreased.In this paper,the seismic characteristics of two kinds of steel frame-concrete shear resistant structures are investigated.Finite element method is applied in the seismic response analyses,and the change of the column spacing is taken into account.The change rule of the axial stress ratio is found.And the computational results according to Chinese Code are compared with that of American method.At last,some design advices are given.
引文
[1]方愕华,钱稼茹.我国高层建筑抗震设计的若干问题[J].土木工程学报,1999,32(1):3~8.
[2]卢文生,吕西林.框架剪力墙结构模态静力非线性抗震分析方法研究[J].地震工程与工程震动,2005,25(1):58~66.
[3]ICBO(国际建筑公务员委员会),Un iform Bu ild ing Code(美国统一建筑法规)[S].
[4]蔡益燕.双重体系中框架的剪力分担率[J].建筑钢结构进展,2004,6(2):60~61.
[2]卢文生,吕西林.框架剪力墙结构模态静力非线性抗震分析方法研究[J].地震工程与工程震动,2005,25(1):58~66.
[3]ICBO(国际建筑公务员委员会),Un iform Bu ild ing Code(美国统一建筑法规)[S].
[4]蔡益燕.双重体系中框架的剪力分担率[J].建筑钢结构进展,2004,6(2):60~61.
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