论文部分内容阅读
由于时域、频域分析中阻尼的选取方法不同,其计算结果有时会有很大的差别。通过对不同厚度的单一均匀土层和多层土层在不同地震动作用下的反应分析,比较了目前常用的不同Rayleigh阻尼系数的时域结果和频域等效线性化结果,指出影响阻尼系数的不同目标频率的选取是时域计算结果异同的主要原因,探讨了由频域分析中的滞回阻尼比确定时域分析中的Rayleigh阻尼系数的方法,从而为利用滞回阻尼在时域分析中进行土层地震反应分析提供了依据。为了减少时域与频域计算结果的误差,最好采用完整的Rayleigh阻尼公式,且目标频率选取土层的第1和第3阶自振频率。
Due to the different selection methods of damping in time domain and frequency domain analysis, the calculation results sometimes have great differences. By analyzing the response of different uniform thick and multi-layered soil under different ground motions under different ground motions, the time-domain results and frequency-domain equivalent linearization results of different Rayleigh damping coefficients are compared. It is pointed out that the influence of damping coefficient The selection of different target frequencies is the main reason for the similarities and differences in the time-domain calculation results. The method of determining the Rayleigh damping coefficient in the time-domain analysis from the hysteresis damping ratio in the frequency domain analysis is discussed. In order to use hysteresis damping in the time domain analysis In the soil seismic response analysis provided the basis. In order to reduce the errors in the calculation results between the time domain and the frequency domain, it is better to use the complete Rayleigh damping formula and select the 1st and 3rd order natural frequencies of the soil layer at the target frequency.