行波效应对大跨度结构地震响应的影响
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摘要
基于大质量法,介绍了大跨度结构考虑行波效应的分析模型及解析方程。结合某工程实例,对结构进行多点激励(行波效应)分析,并与一致激励下的地震响应进行了对比,结果表明:行波效应对结构内力的影响显著。波速越小,影响越大;同一波速对不同楼层影响不同,随着层数增加,影响逐渐减小;当波速为300 m/s时,行波效应对杆件内力的影响最大达23.65%。在大跨度结构的抗震分析中为得到更精确的结果应考虑行波效应对结构的影响。
The great mass method was used to derive the analysis model and equations for long-span structure, in which the wave passage effect in the seismic events was considered. By way of example of a structure, contrast of the multi-support excitation (wave passage effect) to uniform excitation, the conclusion is that the influence of wave passage effect on seismic responses of long-span structures is significant. In general, the smaller is the wave speed, the bigger is the effect, the influence of the same speed is different to the different floors, less effect on higher floors. When the traveling wave speed is 300 m/s, the wave passage effect on the internal forces of control elements can reach a maximum of 23.65%. In order to conduct an accurate seismic analysis of the long-span structures montioned before, the wave passage effect should be put into consideration.
The great mass method was used to derive the analysis model and equations for long-span structure, in which the wave passage effect in the seismic events was considered. By way of example of a structure, contrast of the multi-support excitation (wave passage effect) to uniform excitation, the conclusion is that the influence of wave passage effect on seismic responses of long-span structures is significant. In general, the smaller is the wave speed, the bigger is the effect, the influence of the same speed is different to the different floors, less effect on higher floors. When the traveling wave speed is 300 m/s, the wave passage effect on the internal forces of control elements can reach a maximum of 23.65%. In order to conduct an accurate seismic analysis of the long-span structures montioned before, the wave passage effect should be put into consideration.
引文
[1] 项海帆.斜张桥在行波作用下的地震反应分析[J].同济大学学报,1983,11(2) :1-9．
[2] 苗家武,胡世德,范立础.大型桥梁多点激励效应的研究现状与发展[J].同济大学学报,1999,27(2) :189-193．
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[5] 楼梦麟,邸龙.地震行波激励下单层柱面网壳反应分析[J].结构工程师,2005,21(5) :48-52．
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[7] 李忠献,林伟,丁阳.行波效应对大跨度空间网格结构地震响应的影响[J].天津大学学报,2007,40(1) :1-8．
[8] 杨溥,李英民,赖明.结构时程分析法输入地震波的选择控制指标[J].土木工程学报,2000,33(6) :33-37．
[9] 王亚勇,刘小第,程民宪.建筑结构时程分析法输入地震波的研究[J].建筑结构学报,1991,12(2) :51-60．
[10] 刘枫,肖从真,徐自国,等.首都机场3号航站楼多维多点输入时程地震反应分析[J].建筑结构学报,2006,27(5) :56-63．
[2] 苗家武,胡世德,范立础.大型桥梁多点激励效应的研究现状与发展[J].同济大学学报,1999,27(2) :189-193．
[3] 王明晔,叶爱君,胡世德.行波激励下多跨连续梁桥地震反应分析[J].结构工程师,2007,23(4) :49-54．
[4] 丁阳,王波.大跨度空间网格结构在地震行波作用下的响应[J].地震工程与工程振动,2002,22(5) :71-76．
[5] 楼梦麟,邸龙.地震行波激励下单层柱面网壳反应分析[J].结构工程师,2005,21(5) :48-52．
[6] 苏亮,董石麟.竖向多点输入下两种典型空间结构的抗震分析[J].工程力学,2007,24(2) :85-90．
[7] 李忠献,林伟,丁阳.行波效应对大跨度空间网格结构地震响应的影响[J].天津大学学报,2007,40(1) :1-8．
[8] 杨溥,李英民,赖明.结构时程分析法输入地震波的选择控制指标[J].土木工程学报,2000,33(6) :33-37．
[9] 王亚勇,刘小第,程民宪.建筑结构时程分析法输入地震波的研究[J].建筑结构学报,1991,12(2) :51-60．
[10] 刘枫,肖从真,徐自国,等.首都机场3号航站楼多维多点输入时程地震反应分析[J].建筑结构学报,2006,27(5) :56-63．
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