Issue 40

Z. Zhang et alii, Frattura ed Integrità Strutturale, 40 (2017) 149-161; DOI: 10.3221/IGF-ESIS.40.13 149 A thermography-based method for fatigue behavior evaluation of coupling beam damper Zhe Zhang Faculty of Vehicle Engineering and Mechanics Dalian University of Technology, State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian 116024, China Jinping Ou, Dongsheng Li Faculty of Infrastructure Engineering Dalian University of Technology, Dalian 116024, China Shuaifang Zhang Department of Mechanical Engineering Penn State University, State College 16802, USA Junling Fan Aircraft Strength Research Institute, Xi'an 710065, China fanjunling@mail.dlut.edu.cn A BSTRACT . Under cyclic load, local fatigue damage will occur in the metal damper widely used in the shear wall. This will deteriorate the stiffness of damper and weaken the hysteresis behaviour. The present paper proposed a new and easy method to manufacture kinds of coupling beam dampers. A thermography-based experiment was used to study the energy dissipation and damage accumulation during fatigue process of the metal damper. Based on the temperature variation related to fatigue damage process, the relationship between the plastic deformation and thermal energy dissipation was quantitatively established. Besides, the relationships between the temperature increase to damage accumulation and mechanical load were analyzed systematically. K EYWORDS . Coupling beam damper; Hysteresis behavior; Energy dissipation; Fatigue damage. Citation: Zhang, Z., Ou, J., Li, D., Zhang. S., Fan, J., A thermography-based method for fatigue behavior evaluation of coupling beam damper, Frattura ed Integrità Strutturale, 40 (2017) 149-161. Received: 09.11.2016 Accepted: 21.03.2017 Published: 01.04.2017 Copyright: © 2017 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. I NTRODUCTION he coupling shear wall structure is a very common structure type due to its strong anti-lateral stiffness and great load carrying capability. Paulay et al. [1] employed the diagonal crossing reinforcement to improve the seismic resistance of the reinforcement concrete. Coull [2] used the stiffing beam on the top of the shear wall to T