Buckling and Deformation of BIB Member under Axial Compressive Force

• Main Authors: Chao-Hsiung Li, 李超雄
• Other Authors: Cheng-Cheng Chen
• Format: Others
• Language: zh-TW
• Published: 1993
• Online Access: http://ndltd.ncl.edu.tw/handle/75658451797026061390

碩士 === 國立臺灣科技大學 === 營建工程技術學系 === 81 === From the investigation of structural failure after severe earthquake and also from laboratory testing,it has been found that conventional Concentrically Braced Frame (CBF) usually suffer from strength degradation and limited ductility after bracing member buckle. In order to improve the seismic resistance behavior of CBF, a new system has been developed which the buckling of bracing member can be avoided.This bracing is called Buckling Inhibited Bracing (BIB) and the frames contain BIB member is designated as Ductile Concentrically Braced Frame (DCBF). Although DCBF has been found to process good seismic resistance behavior , yet more research has to be carried out before design guild lines can be established. This reported the BIB member by using nonlinear finite element method and structure testing.The following are the preliminary findings from this study: (1) The global buckling strength of BIB system increases with the increase of the moment of inertial of steel bracing and its lateral support device.The increase of lateral unsupported length will decrease the global buckling strength of BIB system. (2) The increase of gap width between steel bracing and its lateral support device will decrease the strength of BIB system. (3) The load-deformation relationship of steel bracing became irregular as the width of gap between steel bracing and latral support increase. (4) With the increase of axial deformation of steel bracing,its deformation governed by higher mode gradually. (5) Out-of-plane force of steel bracing become larger as the width of gap between steel bracing and lateral support increase. (6) Out-of-plane force of steel bracing become larger as the deformation governed by higher mode. (7) The moment of lateral support device increases with the increase of axlal deformation and force.