Abstract
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.
Highlights
Complex sedimentary basin sites have a significant amplification effect on ground motion
The artificial boundary and the explicit finite element method are combined to develop a multitransmitting formula (MTF) in automatic dynamic incremental nonlinear analysis (ADINA) software; the input and scattering of seismic waves on the boundary are achieved, and the accuracy of the calculation results is verified. This method can obtain a “pure” site effect independent of the source and propagation path and meet the needs of basin effect research and major engineering input ground motion; the model is applied to the numerical simulation of the basin effect in the Yuxi Basin
MTF formula, ADINA software provides a spatiotemporal decoupling finite element algorithm utilizing the combination of the lumped mass finite element method and the central difference method
Summary
Complex sedimentary basin sites have a significant amplification effect on ground motion. The artificial boundary and the explicit finite element method are combined to develop a multitransmitting formula (MTF) in automatic dynamic incremental nonlinear analysis (ADINA) software; the input and scattering of seismic waves on the boundary are achieved, and the accuracy of the calculation results is verified. This method can obtain a “pure” site effect independent of the source and propagation path and meet the needs of basin effect research and major engineering input ground motion; the model is applied to the numerical simulation of the basin effect in the Yuxi Basin
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