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在多点激励地震反应分析中,传统的随机振动分析方法存在数值积分耗时太长的问题。为了克服这一缺点,ANSYS通过对输入功率谱采用对数形式的分段线性表示,然后采用解析解积分方式进行随机振动求解,计算效率精确高效。采用该方法对一高位隔震多塔连体结构进行双向水平地震动作用下多点激励随机地震响应分析,并对空间变化地震动作用下连廊桁架杆件内力响应极大值的均值进行比较分析。分析结果表明:在水平双向地震动作用下,考虑行波效应和部分相干效应会使连廊杆件轴力有所增大,在设计时应引起重视。
In the multi-point excitation seismic response analysis, the traditional stochastic vibration analysis method has the problem of numerical integration time-consuming. In order to overcome this shortcoming, ANSYS calculates the input power spectrum logarithmically by piecewise linear representation, and then uses analytic solution integral method to solve the random vibration. The computational efficiency is accurate and efficient. This method is used to analyze the random seismic response of multi-point excitation of a high-rise seismic isolation multi-tower connected structure under bidirectional horizontal ground motion and to compare the mean value of the internal force response maxima of the truss members subjected to spatial changes in seismic motion analysis. The analysis results show that considering the traveling wave effect and partial coherence effect, the axial force of the corridor bar will be increased under the horizontal bidirectional ground motion, which should be paid attention to in design.