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Experimental study of friction dissipators for seismic protection of building structures

Earthquake Engineering and Engineering Vibration 2011年第4期10卷 475-486页

作者： F. López-Almansa S.T. de la Cruz C. Taylor Technical University of Catalonia Architecture Structures Department Universidad Autónoma de Ciudad Juárez Civil and Environmental Engineering Department Civil Engineering Department University of Bristol

This paper presents the results from unidirectional shaking table tests of two reduced scale steel models of a building frame, with one and two floors, respectively. These frames incorporate friction dissipators at every floor. The inputs are sine-dwells and artificial and registered earthquakes. This study is part of a larger research project aiming to assess the seismic efficiency of friction dissipators by means of an integrated numerical and experimental approach. Inside this framework, the main objectives of these experiments are to：（i） collect a wide range of results to calibrate a numerical model derived within the project, （ii） clarify some of the most controversial issues about friction dissipators （including behavior for inputs containing pulses, capacity to reduce resonance peaks, introduction of high frequencies in the response, and self- generated eccentricities）, （iii） better understand their dynamic behavior, （iv） provide insight on the feasibility and reliability of using simple friction dissipators for seismic protection of building structures and （v） characterize the hysteretic behavior of these devices. Most of these objectives are satisfactorily reached and relevant conclusions are stated.

关键词： building structures earthquake engineering passive control friction energy dissipators experimentalverification shaking table tests

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Methods for Progressive Collapse Analysis of building structures Under Blast and Impact Loads

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Transactions of Tianjin University 2008年第5期14卷 329-339页

作者：李忠献师燕超 School of Civil Engineering Tianjin University

Progressive collapse of building structures under blast and impact loads has attracted great attention all over the world. Progressive collapse analysis is essential for an economic and safe design of building structures against progressive collapse to blast and impact loads. Because of the catastrophic nature of progressive collapse and the potentially high cost of constructing or retrofitting buildings to resist it, it is imperative that the progressive collapse analysis methods be reliable. For engineers, their methodology to carry out progressive collapse evaluation need not only be accurate and concise, but also be easily used and works fast. Thus, many researchers have been spending lots of effort in developing reliable, efficient and straightforward progressive collapse analysis methods recently. In the present paper, current progressive collapse analysis methods available in the literature are reviewed. Their suitability, applicability and reliability are discussed. Our recent proposed new method for progressive collapse analysis of reinforced concrete frames under blast loads is also introduced.

关键词： progressive collapse analysis building structures blast load impact load

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Design method of multiple time-delay controller for active structural vibration control

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Applied Mathematics and Mechanics(English Edition) 2009年第11期30卷 1405-1414页

作者：陈龙祥蔡国平 Department of Engineering Mechanics Shanghai Jiaotong University State Key Laboratory of Ocean Engineering Shanghai Jiaotong University

An optimal control method for seismic-excited building structures with multiple time delays is investigated in this paper. The system state equation with multiple time delays is discretized and transformed into a standard discrete form without any explicit time delay by a particular augmenting for state variables. A time-delay controller is then designed based on this standard equation using the discrete optimal control method. Effectiveness of the proposed controller is demonstrated by numerical simulations. Simulation results indicate that a very small time delay may result in the instability of the control system if it is not compensated in the control design. Time delay may be compensated effectively by the proposed controller, in the mean time, an effective control may be obtained. The proposed controller is valid for both small and large time delays.

关键词： building structures active control multiple time delays

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Describe the Process of Retrofitting Existing buildings and Evaluate the Effectiveness of it in Improving the Seismic Performance of structures in Earthquake-prone Regions

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Journal of building Material Science 2019年第2期1卷 16-19页

作者： Chang Liu Independent Researcher China

At present,earthquakes are a serious problem for *** damages and collapses of buildings were caused by earthquakes in different *** is reported that there are more than 68,858 deaths and hundreds of billions RMB losses in the May 12,2008 Great Wenchuan Earthquake[16].So,more attention should be paid to seismic *** order to face the challenges of earthquake on building,the seismic retrofitting was put forward,which“is the modification of existing structures to make them more resistant to seismic activity,ground motion,or soil failure due to earthquakes”[2].

关键词： building structures Seismic technology Effective Vibration isolation Damper system

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