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Shaking table comparative test and associated study of a stepped wall-frame structure

Earthquake Engineering and Engineering Vibration 2014年第3期13卷 471-485页

作者： Xu Weixiao Sun Jingjiang Yang Weisong Du Ke Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering Mechanics China Earthquake Administration

A new structural system called a stepped wall-frame structure is proposed in this study to solve the bottom yielding problem of RC frames, which widely occurred during previous earthquakes such as thc Wcnchuan and Yushu earthquakes in China. A 1/5 scale ordinary RC frame model and a stepped wall-frame model were subjected to shake table motions together to study the seismic behavior of the new structural system. This paper presents the dynamic characteristics, the seismic responses and the failure and collapse mechanism of the two models under low, moderate and high intensity shaking. The test results and further analysis demonstrate that the seismic performance of stepped wall-frame structures is superior to ordinary RC frames in terms of the well-controlled deformation pattern and more uniformly distributed damage. The stepped wall can effectively suppress the bottom yielding mechanism, and is simple, economical and practical tbr engineering practice.

关键词： stepped wall-flame strt, cture damage mechanism control shake table test drift ratio collapse mechanism

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Earthquake simulator tests and associated study of an 1/6-scale nine-story RC model

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Earthquake Engineering and Engineering Vibration 2007年第3期6卷 281-288页

作者：孙景江王涛齐虎 Institute of Engineering Mechanics China Earthquake Administration Harbin 150080 China Heilongjiang Institute of Science and Technology Harbin 150080 China

Earthquake simulator tests of a 1/6-scale nine-story reinforced concrete frame-wall model are described in the paper. The test results and associated numerical simulation are summarized and discussed. Based on the test data, a relationship between maximum inter-story drift and damage state is established. Equations of variation of structural characteristics （natural frequency and equivalent stiffness） with overall drifts are derived by data fitting, which can be used to estimate structural damage state if structural characteristics can be measured. A comparison of the analytical and experimental results show that both the commonly used equivalent beam and fiber element models can simulate the nonlinear seismic response of structures very well. Finally, conclusions associated with seismic design and damage evaluation of RC structures are presented.

关键词： earthquake simulator test reinforced concrete structure nonlinear analysis drift ratio

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Effect of near-fault earthquakes with forward directivity on telecommunication towers

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Earthquake Engineering and Engineering Vibration 2011年第2期10卷 211-218页

作者： M.Yahyai B.Rezayibana E.Mohammadrezapour Department of Civil Engineering K.N. Toosi University of Technology Islamic Azad University

In this paper, the effect of pulse-type motions caused by forward directivity that can release huge amounts of energy in a short time period is studied on a telecommunication tower. Since telecommunication towers have longer periods, they are not as affected by seismic forces. Nevertheless, near source earthquakes characterized by high velocity and velocity pulses can change the behavior of these structures. For this reason, a telecommunication tower located near active faults was selected in this study. Considering the probable earthquake magnitude at the site and the distance of the tower from adjacent faults, nine simulated pulses and three near-fault earthquake records with forward directivity are selected and applied to a 3D finite element model of the tower. The results of nonlinear dynamic analysis, i.e., displacements and damage in the tower, indicate that the maximum displacement and drift ratio of the tower under the pulses are obviously affected by the ratio of the structure period to pulse period. When this ratio is decreased and close to 1.0, the maximum displacement and drift ratio are sharply increased and cause large displacements in the tower.

关键词： near-fault earthquake velocity pulse nonlinear dynamic analysis drift ratio

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