钢管拱桁架在地震作用下的动力响应研究
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摘要
研究了单榀钢管空间拱桁架在地震荷载作用下的动力响应。采用ANSYS/LS-DYNA非线性有限元动力分析程序,探讨了该结构在竖向输入El-centro地震波作用下的动力响应,以及在各级地震荷载作用下,如何计算拱桁架的动力响应。指出结构的位移和内力响应随地震加速度峰值的增加呈非线性变化;支座附近的杆件塑性应变响应最大,发展最快,首先达到材料的极限应变而退出工作;在地震响应中,该结构支座附近的杆件是最薄弱的部位。
This paper studies on the dynamic response of the single steel-pipe space arch truss under the effect of earthquake load, and adopting the nonlinear element dynamic analyzing program ANSYS/LS-DYNA, probes into the dynamic response of this structure under the effect of vertically inputted EI-centro earthquake wave and how to calculate the dynamic response of the arch truss under the earthquake loads at different levels, and points out that the displacement and inner force response of the structure occur the nonlinear variation along with the increase of the peak value of the earthquake acceleration, the plastic strain response of the member bars near the support is the biggest and its development is the fastest and is the first to withdraw from the work because of reaching the critical strain, and the member bars near the support of the structure are the weakest positions in the earthquake response.
This paper studies on the dynamic response of the single steel-pipe space arch truss under the effect of earthquake load, and adopting the nonlinear element dynamic analyzing program ANSYS/LS-DYNA, probes into the dynamic response of this structure under the effect of vertically inputted EI-centro earthquake wave and how to calculate the dynamic response of the arch truss under the earthquake loads at different levels, and points out that the displacement and inner force response of the structure occur the nonlinear variation along with the increase of the peak value of the earthquake acceleration, the plastic strain response of the member bars near the support is the biggest and its development is the fastest and is the first to withdraw from the work because of reaching the critical strain, and the member bars near the support of the structure are the weakest positions in the earthquake response.
引文
[1]李海旺,李春艳,秦冬祺.三角形钢管拱桁架在脉冲载荷作用下的动力稳定性[J].科学之友,2005(9/10):13-16.
[2]马福,李海旺,秦冬祺,等.大跨度单榀拱桁架在地震作用下的动力稳定性研究[G]//第十一届空间结构学术会议论文集.北京:中国土木工程协会,2005:231-235.
[3]支旭东,范峰,沈世钊.简谐荷载下单层球面网壳动力失效机理研究[J].地震工程与工程振动,2005,25(4):76-84.
[2]马福,李海旺,秦冬祺,等.大跨度单榀拱桁架在地震作用下的动力稳定性研究[G]//第十一届空间结构学术会议论文集.北京:中国土木工程协会,2005:231-235.
[3]支旭东,范峰,沈世钊.简谐荷载下单层球面网壳动力失效机理研究[J].地震工程与工程振动,2005,25(4):76-84.
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