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工程力学  2012 

结构地震响应分析的波动方法

DOI: 10.6052/j.issn.1000-4750.2012.06.ST03, PP. 43-56

Keywords: 地震响应,波动方法,高耸结构,框架结构,行波效应,被研究块体

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Abstract:

在结构中构造被研究块体,针对其质心建立动力平衡方程;由考虑弯剪变形的杆端力与杆端位移之间关系式推导出段间内力计算公式;在时间域上交替运用动力平衡方程和段间内力计算公式进行递推计算,给出高耸结构、三维框架结构地震响应分析的波动方法。对于高耸结构,考虑了被研究块体质心与空间离散结点之间的偏心问题,给出了修正的动力学方程。利用框架结构地震响应分析的波动方法研究了短跨结构的行波效应问题。结果表明:采用传统方法计算给出的电视塔地震响应结果会偏小。考虑行波效应时,二维和三维框架结构柱子的剪力和梁端弯矩存在显著增大现象。

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