【摘要】 土层地震反应分析是地震工程研究的重点内容,时域积分法是土层地震反应分析的研究热点。特征线差分法具有计算耗时短、精确度高的特点,同时能够较为真实的反映地震波传播过程和土体的动力非线性特性。传统的特征线差分法以刚性边界计算,导致计算结果持续震荡而不"衰减"。本文将刚性边界条件改为人工边界,能够使计算得到的时程逐渐衰减至零从而符合实际。通过实例计算分析证实了本文工作的正确性,同时发现刚性边界条件下地表的速度时程、加速度时程和反应谱的优势频段会增强、增宽,并随着持时增加这种现象将更加明显。更多还原

【Abstract】 Soil seismic response analysis is an important content of Earthquake Engineering,and the integral method in time domain is the focused point. The characteristic-difference method can solve the problem more precisely in a shorter time,besides,it can reflect the progress of the wave propagation and the non-linear property of the soil. The prevenient method used the rigid boundary,then the time history do not attenuate. In order to make the results close to the real recordings,combine the transmitting boundary with the characteristic-difference method,we calculate an example and find that the preponderant band of frequency of the surface velocity,acceleration and response spectrum becomes stronger and wider under the rigid boundary,and this phenomenon becomes more evident with the duration increases.更多还原