Shaking table test study on seismic performance of inclined pile foundations in liquefiable soil
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ORIGINAL ARTICLE
Shaking table test study on seismic performance of inclined pile foundations in liquefiable soil Wenlong Chen1 · Jianlin Ma1 · Shuai Cao1 · Qinke Wang1 · Mengting Wang1 Received: 8 February 2020 / Accepted: 10 August 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Inclined pile foundations are widely used in civil engineering by virtue of sufficient horizontal stiffness, but few studies have touched upon the seismic performance of inclined piles in liquefiable soil. To better understand the performance of the inclined piles in liquefiable soil under earthquake conditions, a series of 1 g shaking table tests of inclined and vertical piles in liquefiable soil were performed. Superstructure-pile-soil dynamic interaction was considered while three types of earthquake waves with different characteristics were selected as the applied earthquake motions. The horizontal acceleration of the superstructure and the pile cap, the rotational acceleration of the pile cap, the total base shear force, and the bending moment of two types of physical models were monitored and analyzed. The results show that inclined piles in liquefiable soil can effectively reduce the horizontal vibration of the superstructure and the pile cap, and the acceleration reduction of the pile cap is about 2.5 times larger than that of the superstructure. Meanwhile, inclined piles can also reduce the total base shear force, and the extent of reduction depends on the input earthquake wave. Besides, the results suggest that the maximum bending moment of inclined piles is located at the pile head, and its value is positively correlated with the amplitude of the earthquake wave, and is affected by the type of the input earthquake wave. Overall, inclined pile foundations show satisfactory seismic performance for a superstructure-foundation-liquefiable soil system, and this study, with a rich amount of data, can serve as an important reference for the seismic design of inclined piles in liquefiable soil. Keywords Inclined piles · Liquefiable soil · Shaking table test · Superstructure-pile-soil dynamic interaction List of symbols N Scaling factor VP1 Left pile of the vertical pile group VP2 Right pile of the vertical pile group IP1 Left pile of the inclined pile group IP2 Right pile of the inclined pile group η Seismic efficiency of inclined piles Rmax,I Maximum dynamic response of inclined piles * Jianlin Ma [email protected] Wenlong Chen [email protected] Shuai Cao [email protected] Qinke Wang [email protected] Mengting Wang [email protected] 1
School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
Rmax,V Maximum dynamic response of vertical piles 𝜃̇ Rotational acceleration of the pile cap AVL Vertical acceleration on the left sides of the pile cap AVR Vertical acceleration on the right sides of the pile cap L Horizontal distance between the left and right sides of the pile cap Mtop Mass of the equivalent top particle MZ Mass of the support MD Mass of the top parti
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