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Frontiers of Structural and Civil Engineering 2020年第1期14卷 169-184页

作者： Elmira SHOUSHTARI MSaiid SAIIDI Ahmad ITANI Mohamed AMOUSTAFA Department of Civil and Environmental Engineering University of NevadaReno NV 89557USA

This paper presents pretest analysis of a shake Table test model of a 0.35-scale,two-span,steel plate girder bridge.The objective of pretest analysis was to obtain an insight on the seismic response of the bridge model during the shake Table tests.The bridge included seat type abutments,full-depth precast deck panels,and a two-column bent in which columns were pinned to the footing and integral with superstructure.Six accelerated bridge construction connections were incorporated in the bridge model.An analytical model was developed in OpenSees and was subjected to ten input bi-directional earthquake motions including near-fault and far-field records.The overall seismic response of the bridge was satisfactory for all the earthquake records at 100%,150%,and 200%design level.All connections and capacity-protected components remained elastic,and the average ductility capacity surpassed the ductility demand even at 200%design level.Using experimental fragility curves developed for RC bridge columns,it was predicted that there was a probability of 45%that columns would undergo the imminent failure in the last run and a probability of 30%for their failure.

关键词： shake Table test accelerated bridge construction steel girder bridge OpenSEES UHPC simple for dead continuous for live

Deformation and localisation behaviours of reinforced gravelly backfill using shaking Table tests

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Journal of Rock Mechanics and Geotechnical Engineering 2020年第1期12卷 102-111页

作者： H.Munoz T.Kiyota Institute of Industnial Science The University of TokyoTokyoJapan

To understand the deformational behaviours of geosynthetics-reinforced soil retaining walls(GRS RWs),a series of plane-strain shaking Table tests was conducted on retaining wall models.The backfill of the models was made of poorly graded gravel.Deformations and strains in the gravelly backfill induced by seismic loading are recorded in real time,which are of importance to understand the seismic strength and stability of the GRS RW systems,as strain localisation development in the backfill and foundation is related to the degree of strength degradation of the system.In the present study,we aimed at quantifying the induced deformations of the GRS RW models due to shaking.Digital image correlation(DIC)technique was then employed to analyse and provide full-field deformation and motion images with the models.It is demonstrated that,unlike conventional contact devices that are yet limited to provide quantities of a singular and fixed location,DIC provides deformation and motion of the area of interests to reveal the evolution of localisation.

关键词： Geosynthetic-reinforced soil(GRS) Retaining wall(RW)model Shaking Table test Digital image correlation(DIC) Localisation

Preliminary Study on Broadband Resonance of Shaking Table Based on the Compressibility of Gas

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Journal of Beijing Institute of Technology 2019年第2期28卷 257-264页

作者： Xinghua Zhou Xiao Sun Kehong Tang Lili Cheng Dingxuan Zhao School of Mechanical Science and Engineering Jilin UniversityChangchun 130025China Institute of Applied Technology Jilin UniversityChangchun 130012China College of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China

In order to improve the performance of the shaking Table,a vibration-enhanced shaking Table which exploited broadband resonance was constructed.The broadband resonance was realized by an adjusTable stiffness mechanism which exploited gas compressibility.Different from the traditional device,a gas filled cylinder(GFC)was mounted between the shake Table and the exciter,and a pressure regulator was designed to regulate the gas pressure of the GFC.The natural frequency of the designed shaking Table can be adjusted based on the compressibility of gas during the test.The principle of stiffness adjustment was theoretically analyzed and a series of experiments were carried out to investigate the effects of regulating the natural frequency.The experimental results indicate that the amplitude can be twice amplified and the natural frequency can be regulated between 2 0 Hz and 6 0 Hz.

关键词： shaking Table gas compressibility hydraulic variable stiffness broadband resonance

Study of Shaking Table Test on Dynamic Response Characteristics and Failure Mechanism of the Loess Slope

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Earthquake Research in China 2020年第1期34卷 121-135页

作者： PU Xiaowu WANG Lanmin WANG Ping CHAI Shaofeng XU Shiyang Key Laboratory of Loess Earthquake Engineering Lanzhou Institute of SeismologyCEALanzhou 730000China Key Laboratory of Mechanics on Disaster and Environment in Western China Lanzhou UniversityMinistry of EducationLanzhou 730000China College of Civil Engineering and Mechanics Lanzhou UniversityLanzhou 730000China

The natural loess that covers the ground surface has good stability due to its low water content.However,when violent earthquakes occur,the strong dynamic stress generated in the slope may induce landslide disasters with different sizes.In this paper,a large-scale shaking Table model test is used to reveal the dynamic response and instability failure process of the loess slope.The test results show that different parts of the slope have different vibration characteristics and the first natural frequency in the model increases with the increase of the slope height.The response acceleration of different parts may change due to the coupling relationship between the spectral characteristics of input wave and the natural frequencies of different parts of slope,suggesting the characteristics of regional differential dynamic response.Under the condition of different dynamic response,stress state and boundary conditions of different parts of slope,a rapid microstructural damage,cumulative residual deformation evolution,and tension-shear coupling instability failure process may appear at the top of the slope with the strong dynamic response associated with the increase of dynamic loading intensity.The Sd values presented in this paper may reflect soil damage and slope instability and failure.

关键词： Loess slope Shaking Table Dynamic response Microstructure damage Failure

Shaking Table Test Study on Dynamic Characteristics of Bridge Foundation Reinforcement on Slopes

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Earthquake Research in China 2017年第3期31卷 403-413页

作者： Lei Da Qi Zhihui Jiang Guanlu Wang Zhimeng Li Anhong School of Civil Engineering Southwest Jiaotong UniversityChengdu 610031China Key Laboratory of High-Speed Railway Engineering Ministry of EducationChengdu 610031China China Railway Eryuan Engineering Group Co.Ltd. Chengdu 610031China

With the fast development of bridge construction in mountainous and seismic areas,it is necessary to conduct related research. Based on the design of a shaking Table model test,here are the following test results: the filtering effect exists in soil and is affected by the dynamic constraint conditions,the amplitude is strengthened around the natural frequency and weakened in other frequency bands in the Fourier spectrum. Since the acceleration scaling effect occurred on a sloped surface,the acceleration response decreases from the outside to the inside in soil. The dynamic response is relatively strong near the slip surface in bedrock due to the reflection of seismic waves. The failure mode of landslide is decided by the slope angle and slipping mass distribution, and the test shows the front row stabilizing piles should keep a proper distance from bridge foundation so that seismic resistance can be guaranteed for the bridge foundation.

关键词： Shaking Table test Stabilizing pile Filtering effect Dynamic response Failure mode

Shaking Table Tests on Bridge Foundation Reinforced by Antislide Piles on Slope

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Earthquake Research in China 2019年第3期33卷 514-524页

作者： ZHOU Heng SU Qian LIU Jie YUE Fei School of Civil Engineering Southwest Jiaotong UniversityChengdu 610031China Key Laboratory of High-Speed Railway Engineering Ministry of EducationChengdu 610031China

Based on the requirement of seismic reinforcement of bridge foundation on slope in the Chengdu-Lanzhou railway project,a shaking Table model test of anti-slide pile protecting bridge foundation in landslide section is designed and completed. By applying Wenchuan seismic waves with different acceleration peaks,the stress and deformation characteristics of bridge pile foundation and anti-slide pile are analyzed,and the failure mode is discussed. Results show that the dynamic response of bridge pile and anti-slide pile are affected by the peak value of seismic acceleration of earthquake,with which the stress and deformation of the structure increase. The maximum dynamic earth pressure and the moment of anti-slide piles are located near the sliding surface,while that of bridge piles are located at the top of the pile. Based on the dynamic response of structure,local reinforcement needs to be carried out to meet the requirement of the seismic design. The PGA amplification factor of the surface is greater than the inside,and it decreases with the increase of the input seismic acceleration peak. When the slope failure occurs,the tension cracks are mainly produced in the shallow sliding zone and the coarse particles at the foot of the slope are accumulated.

关键词： Shaking Table test Anti-slide pile Bridge pile foundation Dynamic response Damage mode

The Shaking Table Test on the Performance of Cement-mixed Piles in Liquefiable Railway Foundations

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Earthquake Research in China 2019年第1期33卷 120-131页

作者： ZHAO Mengyi XIE Qiang CAO Xinwen ZHAO Wen Faculty of Geosciences and Environmental Engineering Southwest Jiaotong University School of Civil Engineering Southwest Jiaotong University

Cement-mixed piles,as countermeasure against liquefaction of silt and sand ground,can improve the shear strength and bearing capacity of foundation soil,meaning cement-mixed piles are capable of resisting displacement when an earthquake happens. However,investigations of cement-mixed piles by experimental methods such as the shaking Table test is few and far between. It is especially true for the seismic performance of cement-mixed piles in liquefiable railway foundations in high seismic intensity regions. To this end,a cross-section of the Yuxi-Mengzi railway was selected as the prototype and studied by the shaking Table test in this study. The results showed that composite foundation of cementmixed piles was not liquefied when the seismic acceleration was lower than 0. 30g. In the process of acceleration increasing from 0. 30g at 2Hz to 0. 60g at 3Hz,the upper middle silt outside slope toe was partly liquefied. The foundation soil under the shoulders and center of subgrade was far from the initial liquefaction criterion during the test. Cementmixed piles can effectively reduce the embankment settlement and differential settlement. It can be concluded that, the design of cement-mixed piles can ensure the seismic performance of the subgrade,and satisfy the seismic design requirements of the YuxiMengzi railway in areas of VIII degrees seismic fortification intensity.

关键词： Liquefaction Cement-mixed pile Railway Shaking Table test

Vertical shaking Table tests on the structure with viscoelastic multi-dimensional earthquake isolation and mitigation devices

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Science China(Technological Sciences) 2009年第10期52卷 2869-2876页

作者： XU ZhaoDong SHI BenQiang WU KeYi ZENG Xiao RC&PC Key Laboratory of Education Ministry Southeast UniversityNanjing 210096China Shun De Country Garden Holdings Co.Ltd Shunde 528312China Huaxin Past&Telecom Consulting and Designing Institute Co.Ltd Hangzhou 310014China

The viscoelastic multi-dimensional earthquake isolation and mitigation device is a new kind of passive control device, which can perform its "name-giving" task of earthquake isolation and earthquake mitigation simultaneously. In order to quantify its vertical earthquake isolation and mitigation effect on structures, firstly, shaking Table tests on steel frame structures with and without the devices were carried out; secondly, analysis on dynamic characteristics and dynamic responses of the structures was also performed; furthermore, the finite element analytical results and the experimental results were compared. It can be shown from the analytical and experimental results that the devices have noticeable earthquake isolation and mitigation effect in the vertical direction.

关键词： earthquake isolation and mitigation shaking Table test finite element dynamic response

Shaking Table test and numerical simulation of an isolated cylindrical latticed shell under multiple-support excitations

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Earthquake Engineering and Engineering Vibration 2019年第3期18卷 611-630页

作者： Xue Suduo Shan Mingyue Li Xiongyan Liang Shuanzhu Huang Fuyun Liu Yi Spatial Structures Research Center Beijing University of Technology Beijing 100124 China College of Civil Engineering Fuzhou University Fuzhou 350108 China

In order to study the infl uence of the ground motion spatial eff ect on the seismic response of large span spatial structures with isolation bearings, a single-layer cylindrical latticed shell scale model with a similarity ratio of 1/10 was constructed. An earthquake simulation shaking Table test on the response under multiple-support excitations was performed with the high-position seismic isolation method using high damping rubber (HDR) bearings. Small-amplitude sinusoidal waves and seismic wave records with various spectral characteristics were applied to the model. The dynamic characteristics of the model and the seismic isolation eff ect on it were analyzed at varying apparent wave velocities, namely infi nitely great, 1000 m/s, 500 m/s and 250 m/s. Besides, numerical simulations were carried out by Matlab software. According to the comparison results, the numerical results agreed well with the experimental data. Moreover, the results showed that the latticed shell roof exhibited a translational motion as a rigid body after the installation of the HDR bearings with a much lower natural frequency, higher damping ratio and only 1/2~1/8 of the acceleration response peak values. Meanwhile, the structural responses and the bearing deformations at the output end of the seismic waves were greatly increased under multiple-support excitations.

关键词： single-layer cylindrical latticed shell HDR bearings seismic isolation multiple-support excitations shaking Table test

Help Those Missing from the Table——Confronting Gender Issues in New Looks

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Bulletin of the Chinese Academy of Sciences 2019年第4期33卷 230-235页

作者： SONG Jianlan 不详

The widespread application of new technologies,while empowering women with new opportunities,might also put them at disadvantage.For example,in comparison with males,the application of AI might be more likely to cost them their jobs.Meanwhile,women are missing out the opportunity to participate in the policy-making process–they are absent from the Table.If no change is made in the current policies,we will miss the goal to achieve gender equality,the fifth of the 17 Sustainable Development Goals set for UN’s 2030 Agenda for Sustainable Development,warned elite women scientists with the Organization for Women in Science for the Developing World(OWSD).What shall be done now?How can we make a difference?They are in action to help.

关键词： SDG Help Those Missing from the Table Confronting Gender Issues in New Looks