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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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Complex complete quadratic combination method for damped system with repeated eigenvalues

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Earthquake Engineering and Engineering Vibration 2016年第3期15卷 537-550页

作者： Yu ruifang Zhou Xiyuan Abduwaris Abduwahit Institute of Geophysics China Earthquake AdministrationBeijingChina beijing University of technology BeijingChina Earthquake Administration of Xinjiang Uyghur Autonomous region Wulumuqi 830011China

A new response-spectrum mode superposition method, entirely in real value form, is developed to analyze the maximum structural response under earthquake ground motion for generally damped linear systems with repeated eigenvalues and defective eigenvectors. This algorithm has clear physical concepts and is similar to the complex complete quadratic combination （CCQC） method previously established. Since it can consider the effect of repeated eigenvalues, it is called the CCQC-r method, in which the correlation coefficients of high-order modal responses are enclosed in addition to the correlation coefficients in the normal CCQC method. As a result, the formulas for calculating the correlation coefficients of high-order modal responses are deduced in this study, including displacement, velocity and velocity-displacement correlation coefficients. Furthermore, the relationship between high-order displacement and velocity covariance is derived to make the CCQC-r algorithm only relevant to the high-order displacement response spectrum. Finally, a practical step-by-step integration procedure for calculating high-order displacement response spectrum is obtained by changing the earthquake ground motion input, which is evaluated by comparing it to the theory solution under the sine-wave input. The method derived here is suitable for generally linear systems with classical or non-classical damping.

关键词： damped system repeated eigenvalue response spectrum complex complete quadratic combination correlation coefficient high-order modal responses

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