两种改进虚拟激励法比较及大跨结构的行波效应分析
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摘要
选择高效且易实现的分析方法是实现大跨度结构多点随机地震反应分析的关键步骤之一。首先,对两种改进的虚拟激励法(即直接位移求解法和大质量法)做了简要比较;然后,通过对ANSYS程序的二次开发,实现了直接位移求解法和大质量法的通用有限元计算,进行了这两种改进虚拟激励法的数值精度比较。在此基础上,选择高精度的直接位移求解的虚拟激励法,以能较好模拟长周期地震动特性的杜修力陈厚群功率谱模型作为输入,对某悬索桥结构进行了多点随机地震反应分析,探讨了大跨度结构的响应峰值随地面视波速变化、以及行波效应对结构不同部位反应的影响。
Selection of analysis methods with high efficiency and easy operation is a key step to carry out the analysis of multi-support random seismic response of long-span structures.Firstly,the paper makes a brief comparison was presented between two improved pseudo-excitation methods(e.g.direct displacement method and large mass method);secondly,through the secondary development of ANSYS program,the finite element calculation of direct displacement method and large mass method are both achieved,and the comparison between the numerical accuracy of such two improved pseudo-excitation methods is carried out.Furthermore,direct displacement pseudo-excitation method with high-precision was chosen in order to better simulate the long-period ground motion characteristics of the Du Xiuli-Chen Houqun power spectrum model as the input,and the multi-point random earthquake response analysis on a suspension bridge structure was made.Then the peak response of long-span structure with the varying wave velocity and the traveling wave effects on different parts of the structure were discussed.
Selection of analysis methods with high efficiency and easy operation is a key step to carry out the analysis of multi-support random seismic response of long-span structures.Firstly,the paper makes a brief comparison was presented between two improved pseudo-excitation methods(e.g.direct displacement method and large mass method);secondly,through the secondary development of ANSYS program,the finite element calculation of direct displacement method and large mass method are both achieved,and the comparison between the numerical accuracy of such two improved pseudo-excitation methods is carried out.Furthermore,direct displacement pseudo-excitation method with high-precision was chosen in order to better simulate the long-period ground motion characteristics of the Du Xiuli-Chen Houqun power spectrum model as the input,and the multi-point random earthquake response analysis on a suspension bridge structure was made.Then the peak response of long-span structure with the varying wave velocity and the traveling wave effects on different parts of the structure were discussed.
引文
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[3]李永华,李思明.绝对位移直接求解的虚拟激励法[J].振动与冲击,2009,28(10):185-190.
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[13]欧进萍,王光远.结构随机振动[M].北京:高等教育出版社,1998.
[2]ATES S,BAYRAKTAR A,DUMANOGLU A A.The effect of spatially varying earthquake ground motions on the stochastic response ofbridges isolated with friction pendulum systems[J].Soil Dynamics and Earthquake Engineering,2006,26:31-44.
[3]李永华,李思明.绝对位移直接求解的虚拟激励法[J].振动与冲击,2009,28(10):185-190.
[4]江洋.大跨建筑结构多点输入地震响应计算与抗震设计方法研究[D].北京:清华大学,2010.
[5]杨孟刚,胡建华,陈政清.独塔自锚式悬索桥地震响应分析[J].中南大学学报,2005,36(1):133-137.
[6]刘忠平.三汊矶湘江大桥自锚式悬索桥地震反应研究[D].长沙:中南大学,2007.
[7]焦常科,李爱群,操礼林,等.三塔悬索桥行波效应研究[J].土木工程学报,2010,43(12):100-106.
[8]潘旦光,楼梦麟,范立础.多点输入下大跨度结构地震反应分析研究现状[J].同济大学学报,2001,29(10):1213-1219.
[9]CLOUGH R W,PENZIEN J.Dynamics of Structures[M].New York:McGraw-Hill,1993.
[10]林家浩,张亚辉.随机振动的虚拟激励法[M].北京:科学出版社,2004.
[11]杜修力.水工建筑物抗震可靠度设计和分析用的随机地震输入模型[J].地震工程与工程振动,1998,18(4):76-81.
[12]丁阳,张笈玮,李忠献.行波效应对大跨度空间结构随机地震响应的影响[J].地震工程与工程振动,2008,28(1):24-31.
[13]欧进萍,王光远.结构随机振动[M].北京:高等教育出版社,1998.
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