A three-dimensional multitransmitting formula is developed in ADINA to simulate the input of seismic waves and the scattering of infinite domains at the same time, consistent with the progress of the explicit finite element method of lumped mass. A three-dimensional cube model is built, and a delta pulse wave is input to compare the simulation results with the analytical solutions. The simulation results show that the peak error is 0.2% of the input wave, which meets the requirements of the usual numerical simulation. This method has a certain efficiency advantage in site effect analyses of fine models for localized fields. A velocity structure model of the Yuxi Basin is built, and the associated basin effect is studied by numerical simulation. The distribution of the focusing effect is related to the structure of the narrow east-west and wide north-south features in the Yuxi Basin, and the edge effect is related to the slope of the basin base. A distribution map is given of the amplification effect of ground motion in the basin.

在ADINA中开发了三维多重传输公式，以同时模拟地震波的输入和无限域的散射，这与集总显式有限元方法的进步相一致。建立了三维立方体模型，并输入了增量脉搏波，以将模拟结果与解析解进行比较。仿真结果表明，峰值误差为输入波的0.2％，符合常规数值模拟的要求。该方法在局部场精细模型的场地效应分析中具有一定的效率优势。建立了玉溪盆地速度结构模型，并通过数值模拟研究了相关的盆地效应。聚焦效应的分布与玉溪盆地东西向窄，南北向宽的构造有关，边缘效应与盆地底部的坡度有关。给出了盆地中地震动放大作用的分布图。