Numerical analysis of a shaking table test on dynamic structure‐soil‐structure interaction under earthquake excitations

Li, Peizhen; Liu, Shutong; Lu, Zheng; Yang, Jinping

doi:10.1002/tal.1382

Cited by 38 publications

(17 citation statements)

References 33 publications

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“…The results indicate the following: (a) the strain amplitude at the pile top is much larger than at the middle and tip of the pile due to the rotational stiffness of the pile foundation at the pile top. This observation agrees with the test phenomena in Figure b and other shaking table tests . (b) The strain amplitude increases with the increased PGA of input seismic excitations.…”

Section: Experimental Results Of Pssi System In a Soft Sitesupporting

confidence: 91%

“…(b) The three components are out of sync with each other; they may be in phase or out of phase, mutually overlapped, or offset. These findings agree with the test results . (c) The acceleration spectrum indicates that the high frequency of the spectral components are obviously amplified with greater PGA due to the characteristics of soft soil, the nonlinear behavior in the structure, and dynamic responses of the pile‐soil‐structure system.…”

Section: Experimental Results Of Pssi System In a Soft Sitesupporting

confidence: 88%

“…Although several numerical and experimental studies have been performed on PSSI phenomena by various researchers including the authors' team over the past years, they are limited to small‐scale tests, liquefiable soil, or the simplified superstructure. Large‐scale shaking table tests on PSSI effects of realistic multi‐degree‐of‐freedom structure located in pile group foundation are seldom accomplished.…”

Section: Introductionmentioning

confidence: 99%

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Large‐scale shaking table test on pile‐soil‐structure interaction on soft soils

Yang

Lü

2019

Structural Design Tall Build

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SUMMARY The two large‐scale shaking table tests of tall buildings on soft soils in pile group foundations are performed to capture the effect of the seismic pile‐soil‐structure interaction (PSSI) on the dynamic responses of the pile, soil, and structure. The two different model conditions are observed, including a fixed‐base structure and a structure supported by 3‐by‐3 pile group foundation in soft soil, representing the situations excluding the soil‐structure interaction (SSI) and considering the SSI, respectively. In the tests, the superstructure is a tall building with 12‐story reinforced concrete frame. The pile‐soil‐structure system rests in a shear laminar soil container, which is designed to minimize the boundary effects during shaking table tests. The two models are subjected to various intensity seismic excitations of Shanghai bedrock waves, 1995 Kobe earthquake, and 1999 Chi‐Chi earthquake events. According to the experimental and analytical results, SSI systems have longer natural periods than the fixed‐base structure. In addition, soft soil has amplification effect under smaller seismic excitations and isolation effects under larger earthquake intensities. The strain amplitude at the top of pile is large, and the strain at the middle and tip is relatively small. Whereas the contact pressure is small at the top of pile and large at the middle and tip. From the dynamic responses of the superstructure, it is found that the PSSI amplifies the peak displacements and interstory drifts of the structures supported by pile group foundations by comparing with the fixed‐base structure. Whereas the peak acceleration and interstory shear force of the structure are reduced considering seismic PSSI. The results show that the seismic SSI is not always favorable, however, it may increase certain dynamic responses of the structure. Consequently, the seismic SSI should be considered reasonably, providing insight towards the rational seismic design of buildings rested on soft soils.

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Section: Experimental Results Of Pssi System In a Soft Sitesupporting

confidence: 91%

Section: Experimental Results Of Pssi System In a Soft Sitesupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

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Large‐scale shaking table test on pile‐soil‐structure interaction on soft soils

Yang

Lü

2019

Structural Design Tall Build

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“…This finding agrees with the numerical analysis of adjacent structures considering the SSI effect. [26] (b) The ratios of acceleration peaks at the top of the foundation (A1 point) and on the surface of the neighboring FF (S10 point) are 62.07% and 57.60% in the PL and PS tests, respectively. They are 69.03% and 53.66% under the excitation of the EI and SJ cases, respectively.…”

Section: Seismic Response Of the Foundation Basementioning

confidence: 99%

Shaking table test and theoretical analysis of the pile–soil–structure interaction at a liquefiable site

Li,

Yang,

2018

Structural Design Tall Build

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Summary Pile foundations are widely used to support high‐rise buildings, in which piles transmit foundation loads to soil strata with higher bearing capacity and stiffness. This process alters the dynamic characteristics of the pile–soil–structure system in seismically active areas, especially at a liquefiable site. A series of shaking table tests on liquefiable soils in pile group foundations of tall buildings were performed to evaluate the liquefaction process and dynamic responses of the pile, soil, and structure. The soil was composed of two layers: the upper layer was a clay layer and the lower layer was saturated sand. These layers were placed in a flexible container that was excited by El Centro earthquake events and Shanghai Bedrock waves at different levels. The test results indicate that the pore pressure ratio is gradually enhanced as the amplitude of the input acceleration increases. The liquefied sand has a filtering effect on the vibration with a high frequency and an amplified effect on the vibration with a low frequency. With increased excitation, contact pressure and strain amplitudes of the pile increase, whereas the peak acceleration magnification coefficient decreases. The seismic responses of a structure with pile–soil–structure interaction are generally smaller than those on a rigid foundation.

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“…Li et al [32] used system identification techniques to obtain the response of soil under pile group foundation condition by shake table test results. The soil damping ratio is achieved through iteration from the D − γ d curves [33] based on material property test results [34]. The superstructure' damping ratio is 0.05.…”

Section: Damping Systemmentioning

confidence: 99%

Studies on Pounding Response Considering Structure-Soil-Structure Interaction under Seismic Loads

Liu

Lü

2017

Sustainability

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Pounding phenomena considering structure-soil-structure interaction (SSSI) under seismic loads are investigated in this paper. Based on a practical engineering project, this work presents a three-dimensional finite element numerical simulation method using ANSYS software. According to Chinese design code, the models of adjacent shear wall structures on Shanghai soft soil with the rigid foundation, box foundation and pile foundation are built respectively. In the simulation, the Davidenkov model of the soil skeleton curve is assumed for soil behavior, and the contact elements with Kelvin model are adopted to simulate pounding phenomena between adjacent structures. Finally, the dynamic responses of adjacent structures considering the pounding and SSSI effects are analyzed. The results show that pounding phenomena may occur, indicating that the seismic separation requirement for adjacent buildings of Chinese design code may not be enough to avoid pounding effect. Pounding and SSSI effects worsen the adjacent buildings' conditions because their acceleration and shear responses are amplified after pounding considering SSSI. These results are significant for studying the effect of pounding and SSSI phenomena on seismic responses of structures and national sustainable development, especially in earthquake prevention and disaster reduction.

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Numerical analysis of a shaking table test on dynamic structure‐soil‐structure interaction under earthquake excitations

Cited by 38 publications

References 33 publications

Large‐scale shaking table test on pile‐soil‐structure interaction on soft soils

Large‐scale shaking table test on pile‐soil‐structure interaction on soft soils

Shaking table test and theoretical analysis of the pile–soil–structure interaction at a liquefiable site

Studies on Pounding Response Considering Structure-Soil-Structure Interaction under Seismic Loads

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