外文翻译---防屈曲支撑在亚洲的地位.docxVIP

附录1英文文章翻译（原文）State of the art of buckling-restrained braces in AsiaQiang XieDepartment of Structural Engineering, Tongji University, Shanghai 200092, ChinaReceived 3 September 2004; accepted 19 November 2004Abstract：This paper presents a summary of buckling-restrained braces (BRBs). BRBs show the same loaddeformationbehavior in both compression and tension and higher energy absorption capacity witheasy adjustability of both stiffness and strength. Research and developments of various types of BRBswith different configurations in Asia, especially in Japan, are introduced. Analyses and experimentsare illustrated to show the conditions necessary for restraining steel braces from buckling. Somekey issues of BRB configurations, such as gap and debonding processing between core braces andencasing members, contraction allowance in BRBs and necessary clearances between restrainingpanels and surrounding frames, BRB projection stiffening approaches to prevent it from buckling, arealso described. Based on initial deflections of core braces, both stiffness and strength requirementsof encasing member to prevent buckling of core brace are given. Applications for both new high-risesteel buildings and the seismic retrofit of existing buildings show good prospects of using BRBs. ? 2004 Elsevier Ltd. All rights reserved.Keywords: Steel frame; Buckling; Buckling-restrained braces; Cyclic loading test; Damper; Hysteretic behavior1. IntroductionLateral displacements on structural buildings have been of great concern for engineers.In order to minimize the effect of earthquake and wind forces braces have been usedsuccessfully. However, when the braces are subjected to large compressive forces theyexhibit buckling deformation and show unsymmetrical hysteretic behavior in tensionand compression, and typically exhibit substantial strength deterioration when loadedmonotonically in compression or cyclically, as shown in Fig. 1(a). Ifbuckling of a steelbrace is restrained and the same strength