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华侨大学陈振川全球求助翻译英语论文 (18)

The Fifth International Conference on VIBRATION ENGINEERING AND TECHNOLOGY OF MACHINERY Huazhong University of Science and Technology, Wuhan, P.R. CHINA. 27-28 , August, 2009 © 2009 Huazhong Universiti of Science and Technology Press

OPTIMAL DESIGN OF VISCOELASTIC DAMPERS

CONNECTING ADJACENT STRUCTURES

Sun Huangsheng* Ma Lijie

College of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao 266510,

P.R.China (*Email:shs7528@http://www.wenkuxiazai.net)

ABSTRACT Two adjacent multistory structures are modeled as 2-SDOF system

connected each other with viscoelastic damper (VED). Taken the natural vibration frequency ratio, connection stiffness and linking damping ratio as research parameters, the formulation of structural mean squared deviation (MSD) displacement response and research parameters is derived based on the random vibration theory. Then the relationship of the adjacent structural seismic response versus the parameters including connection viscous damping ratio and linking stiffness is presented. Furthermore, the optimal value of damping ratio and stiffness ratio of the linking VED are investigated. Finally, the seismic responses of two 10-story structures with and without connecting dampers, excited by El Centro and Taft waves, are contrastively analyzed. The results indicate fine earthquake-reduction effect of VEDs connecting adjacent structures. It also shows that selecting appropriate damping parameters of dampers cannot reduce the seismic responses of the two structures connected to the best extent simultaneously. The dampers parameters should be determined according to the best seismic mitigation effect of the primary, auxiliary structure or the combined structure system.

KEY WORDS adjacent structures, viscoelastic damper, seismic reduction, optimal design

I. INTRODUCTION

Buildings in a modern city are often located closely to each other due to limited land available. Also there are many cases when a large structure is divided horizontally into many smaller pieces by expansion or seismic joints to prevent cracks caused by temperature change or pounding caused by seismic excitation, respectively. In most cases, these adjacent buildings are separated without any structural connections or connected only at the ground level. Hence, earthquake-resistant capacity of each building mainly depends on itself. To improve the earthquake resistance of these buildings, the concept of applying control devices to link adjacent buildings has been presented (shown in Fig. 1). The seismic control effectiveness of adjacent buildings connected by energy dissipating devices is strongly depends on the device parameters and installing locations. Xu and He investigated earthquake resistant performance of adjacent buildings connected by VEDs[1]. The parametric study was carried out to find optimum damper properties for adjacent buildings of different stiffness ratios and different heights. Then Xu and Zhan et al. studied experimentally the seismic responses of two 3-story structures with different stiffness linked by oil dampers using a seismic simulator and researched the optimal parameters of dampers[2]. Zhang and Xu researched the optimal parameters of VEDs for achieving the maximum modal damping ratio or the maximum response reduction of adjacent building[3]. The possibility of using passive control devices

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