Multi-shaking-table Test of Pile Group Foundation Under Super-long-span Cable-stayed Bridge

LIANG Fa-yun, JIA Ya-jie, SUN Li-min, XIE Wen, CHEN Hai-bing

China Journal of Highway and Transport ›› 2017, Vol. 30 ›› Issue (12) : 268-279.

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China Journal of Highway and Transport ›› 2017, Vol. 30 ›› Issue (12) : 268-279.

Multi-shaking-table Test of Pile Group Foundation Under Super-long-span Cable-stayed Bridge

  • LIANG Fa-yun1, JIA Ya-jie1, SUN Li-min2, XIE Wen3, CHEN Hai-bing1
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Abstract

To investigate the seismic response of pile groups supporting long-span cable-stayed bridge under uniform excitations, a series of shaking table tests were carried out considering the seismic soil-pile-structure interaction (SSPSI) based on a 1/70 scaled model of an assumed prototype (a cable-stayed bridge with the length of 2 672 m and a main span of 1 400 m). The pylons and piers were fabricated of micro-concrete and iron wire. The piles and pile-caps were made of C40 concrete and rebar with the diameter of 6mm. The natural soil was simulated by sand and sawdust with the mass ratio of 3:1. The scaled model included 8 groups of pile foundation supporting transition piers, auxiliary piers and pylons, respectively. Four types of seismic waves, namely, artificial seismic wave Acce100, natural waves El Centro, Mexico City and Chi-Chi, were employed to investigate the impact of input waves with different predominant frequencies on the seismic response of the pile group foundation. The seismic response of pile group foundation supporting piers and pylons, including pile accelerations, displacements and moments, were highlighted. The results show that on account of the different vibration characteristics of pile group supporting piers or pylons, the same ground motions are transmitted differently to the bottom of transition piers, auxiliary piers and pylons, by dint of the pile group foundation. Seismic waves are changed differently by pile groups at different locations, and the excitations input to superstructure from the bottom of piers or pylons are different. With the peak acceleration of input waves growing, acceleration and relative displacement at pile head for pile groups supporting auxiliary piers and pylons increase, but amplification ratios of peak acceleration decrease. Among the four seismic waves, relative displacement and bending moments at pile head of each pile group caused by Chi-Chi are the largest. The relative displacement and amplification ratios of peak acceleration at the head of pile groups supporting transition piers are larger than that of pile groups supporting auxiliary piers under the Mexico City excitation. However, the opposite results will be acquired under the other 3 types of excitations.

Key words

bridge engineering / seismic response / multi-shaking table test / pile group foundation / pile-soil-structure interaction

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LIANG Fa-yun, JIA Ya-jie, SUN Li-min, XIE Wen, CHEN Hai-bing. Multi-shaking-table Test of Pile Group Foundation Under Super-long-span Cable-stayed Bridge[J]. China Journal of Highway and Transport, 2017, 30(12): 268-279

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