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Characteristics of seismic responses at liquefied and non-liquefied sites with same site conditions

Journal of Modern Transportation 2011年第2期19卷 134-142页

作者： Jianjing ZHANG Changwei YANG The Institute of Geological ＆ Nuclear Science Lower Hutt 5040 New Zealand School of Civil Engineering Southwest Jiaotong University Chengdu 610031 China

To understand the characteristics of seismic response at liquefied sites, a liquefiable site and a non-liquefiable site were selected, separated by about 500 m and having the same site conditions as Class D in the National Earthquake Hazards Reduction Program （NEHRP）. A suite of earthquake records on rock sites are selected and scaled to the spectrum of the Joyner, Boore, and Fumal （JBF） attenuation model for a magnitude 7.5 earthquake at a distance of 50 km. The scaled records were then used to excite the two sites. The effect of pore-water pressure was investigated using the effective stress analysis method, and nonlinear soil behavior was modeled by a soil bounding surface model. Comparisons for spectra, peak ground acceleration （PGA）, peak ground displacement （PGD） and permanent displacement were performed. Results show that the mean ground response spectrum at the non-liquefied site is close to the estimated ground response spectrum from the JBF model, but the mean ground response spectrum at the liquefied site is much lower than the estimated ground response spectrum from the JBF model for periods of up to 1.3 s. The mean PGA at the non-liquefied site is about 1.6-1.7 times as large as that at the liquefied site, but the mean peak ground displacement （PGD） at the non-liquefied site has a slight difference with that at the liquefied site. The mean permanent displacements at the liquefied site are larger than those at the non-liquefied site, particularly at the liquefied layer.

关键词： seismic responses liquefied and non-liquefied excessive pore-water pressure

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Numerical analysis on seismic response and failure mechanism of articulated pile−structure system in a liquefiable site from shaking-table experiments

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Frontiers of Structural and Civil Engineering 2024年第7期18卷 1117-1133页

作者： Pengfei DOU Hao LIU Chengshun XU Jinting WANG Yilong SUN Xiuli DU Department of Hydraulic Engineering Tsinghua UniversityBeijing 100084China Key Laboratory of Urban Security and Disaster Engineering of the Ministry of Education Beijing University of TechnologyBeijing 100124China

This study investigates the seismic response and failure mode of a pile-structure system in a liquefiable site by employing a numerical simulation model combined with the shaking-table results of a soil-pile-structure dynamic *** pile and soil responses obtained from the numerical simulations agreed well with the experimental *** slopes of the dynamic shear-stress-shear-strain hysteretic curves at different positions also exhibited a decreasing trend,indicating that the shear strength of the soil in all parts of the foundation *** peak acceleration of the soil and pile was not clearly amplified in the saturated sand layer but appeared to be amplified in the top *** maximum bending moments appeared in the middle and lower parts of the pile shaft;however,the shear forces at the corresponding positions were not *** can be observed from the deformation mode of the pile-group foundation that a typical bending failure is caused by an excessive bending moment in the middle of the pile shaft if the link between the pile top and cap is articulated,and sufficient attention should be paid to the bending failure in the middle of the pile shaft.

关键词： numerical simulation soil liquefaction pile foundation shaking-table experiment seismic responses failure model

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seismic response of large-span spatial structures under multi-support and multidimensional excitations including rotational components

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Earthquake Engineering and Engineering Vibration 2021年第1期20卷 141-159页

作者： Zhang Jie Li Hongnan Li Chao State Key Laboratory of Coastal and Offshore Engineering Faculty of Infrastructure EngineeringDalian University of TechnologyDalian 116024China School of Civil Engineering Shenyang Jianzhu UniversityShenyang 110168China

To achieve rational and precise seismic response predictions of large span spatial structures(LSSSs),the inherent non-uniformity and multidimensionality characteristics of earthquake ground motions should be properly taken into ***,due to the limitations of available earthquake stations to record seismic rotational components,the effects of rocking and torsional earthquake components are commonly neglected in the seismic analyses of *** this study,a newly developed method to extract the rocking and torsion components at any point along the area of a deployed dense array from the translational earthquake recordings is applied to obtain the rotational seismic inputs for a *** numerical model of an actual LSSS,the Dalian International Conference Center(DICC),is developed to study the influences of multi-support and multidimensional excitations on the seismic responses of *** numerical results reveal that the non-uniformity and multidimensionality of ground motion input can considerably affect the dynamic response of the *** specific degree of influence on the overall and local structural displacements,deformations and forces are comprehensively investigated and discussed.

关键词： large-span spatial structures seismic responses multi-support multidimensional rotational components

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Multi dimensional seismic Response Analysis of Base Isolated Frame Structure with 3D Isolator

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Journal of China University of Geosciences 2005年第1期16卷 66-71,78页

作者： XiongShishu HuangLiting ChenJinfeng SuJingsu SchoolofCivilEngineeringandMechanics HuazhongUniversityofScienceandTechnologyWuhan430074China

The three dimensional lead rubber dish spring bearing (3DB) is proposed in this paper. The 3DB is composed of lead rubber bearing (LRB) and dish spring bearing (DSB) with damper in series. The 3DB put forward in this paper is effective in the resolution of difficulties in strong vertical capacity and vertical damping of three dimensional isolation bearings. It effectively suppresses rocking motions as well. The analytical model and motion equations of multi dimensional seismic responses of 3D base isolated frame structures are established. Taking a five storey frame structure as an example, an extensive simulation analysis is carried out. The results show that the 3D base isolated structure with the proposed 3DB is effective in 3D isolation; it can reduce seismic responses by 50 % compared to a non isolated structure. Therefore, the 3D isolation problem in building can be solved easily and effectively with the 3DB proposed in this paper.

关键词： D base isolator,multi earthquake seismic responses lead rubber bearing dish spring bearing.

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