Seismic response of a S-wave incident elastic foundation free field under the effect of heat

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (10) : 114-122.

YANG Yiqi1，MA Qiang1,2

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Abstract

Based on the theory of wave propagation in thermoelastic media, this paper establishes a model of an elastic foundation free-field under plane S-wave incidence, uses the Helmholtz vector decomposition principle to analyze the wave field in the elastic foundation-free field under thermal effects, and obtains the analytical solution of seismic ground motion in elastic foundation free field under plane S-wave incidence under thermal effects. The influence law of thermal conductivity, medium temperature, thermal expansion coefficient, and other thermal physical parameters on the seismic ground motion of elastic foundation free field is analyzed through numerical calculations. The results show that there are significant differences between the horizontal and vertical displacement amplification coefficients obtained under the two theoretical models with and without thermal effects; the amplification coefficients of surface level and vertical displacement and the corresponding acceleration increase with the increase of thermal expansion coefficient and medium temperature; the effects of thermal conduction coefficient and heat flux phase delay on the amplification coefficients of surface displacement and acceleration are smaller; the amplification coefficients of surface displacement and acceleration increase gradually with the increase of incident wave frequency.

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Thermoelastic medium / Thermal effects / Free field / Seismic ground motion / Plane S-wave

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YANG Yiqi1，MA Qiang1,2. Seismic response of a S-wave incident elastic foundation free field under the effect of heat[J]. Journal of Vibration and Shock, 2024, 43(10): 114-122

References

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