Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Nonlinear soil response under non-uniform seismic excitation from multi-point shaking table tests
Abstract The soil response to large earthquakes is strongly nonlinear, which has a significant influence on the performance of buried infrastructure as well as input motion to superstructures. This paper reports on uniform and non-uniform multi-point shaking table tests to elucidate the effect of soil non-linearity on free-field soil response. Emphasis was placed on investigating the effect of the non-uniform seismic excitation in different directions on the soil response. The tests were conducted on scaled sand deposits enclosed in a suspension continuum soil box using three shaking tables that can induce uniform and non-uniform seismic excitations. Quantitative analyses were performed to study the ground motion response characteristics and variation of free-field soil characteristics underground motions with different intensity, frequency content and directions. The analyses evaluated the soil dynamic characteristics and their variation with strain level, as well as soil acceleration and settlement responses. The results demonstrated that the soil nonlinear behavior is influenced by the ground motion intensity, direction (longitudinal or transverse) and uniformity. Non-uniform ground motion may lead to more pronounced changes of soil structure, which would decrease the soil profile natural frequency and increase its damping ratio. The variation of soil shear modulus with strain also reflected the soil plastic response. The longitudinal excitation had a more pronounced effect on the soil vertical settlement compared with the transverse excitation. However, non-uniform excitation had a minor effect on the soil vertical settlement.
Highlights A shaking table test for scaled sand under multi-point non-uniform seismic excitation is performed. The soil nonlinear behavior is influenced by not only the ground motion intensity but also its direction. The frequency band of the acceleration spectra was wider, the number of peaks was larger under non-uniform excitations. The variation of soil shear modulus with strain also reflected the soil plastic response. The transverse excitation had a minor effect on the soil vertical settlement compared with the longitudinal excitation.
Nonlinear soil response under non-uniform seismic excitation from multi-point shaking table tests
Abstract The soil response to large earthquakes is strongly nonlinear, which has a significant influence on the performance of buried infrastructure as well as input motion to superstructures. This paper reports on uniform and non-uniform multi-point shaking table tests to elucidate the effect of soil non-linearity on free-field soil response. Emphasis was placed on investigating the effect of the non-uniform seismic excitation in different directions on the soil response. The tests were conducted on scaled sand deposits enclosed in a suspension continuum soil box using three shaking tables that can induce uniform and non-uniform seismic excitations. Quantitative analyses were performed to study the ground motion response characteristics and variation of free-field soil characteristics underground motions with different intensity, frequency content and directions. The analyses evaluated the soil dynamic characteristics and their variation with strain level, as well as soil acceleration and settlement responses. The results demonstrated that the soil nonlinear behavior is influenced by the ground motion intensity, direction (longitudinal or transverse) and uniformity. Non-uniform ground motion may lead to more pronounced changes of soil structure, which would decrease the soil profile natural frequency and increase its damping ratio. The variation of soil shear modulus with strain also reflected the soil plastic response. The longitudinal excitation had a more pronounced effect on the soil vertical settlement compared with the transverse excitation. However, non-uniform excitation had a minor effect on the soil vertical settlement.
Highlights A shaking table test for scaled sand under multi-point non-uniform seismic excitation is performed. The soil nonlinear behavior is influenced by not only the ground motion intensity but also its direction. The frequency band of the acceleration spectra was wider, the number of peaks was larger under non-uniform excitations. The variation of soil shear modulus with strain also reflected the soil plastic response. The transverse excitation had a minor effect on the soil vertical settlement compared with the longitudinal excitation.
Nonlinear soil response under non-uniform seismic excitation from multi-point shaking table tests
Han, Junyan (Autor:in) / El Naggar, M. Hesham (Autor:in) / Hou, Benwei (Autor:in) / Du, Xiuli (Autor:in) / Shuai, Yi (Autor:in) / Li, Liyun (Autor:in)
24.07.2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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