The application of Buckling Inhibited Brace on Seismic Resistant Structural Systems

Autor: Hong-Jia Chen, 陳宏嘉
Rok vydání: 2006
Druh dokumentu: 學位論文 ; thesis
Popis: 94
A Buckling Inhibited Brace, or BIB, is composed of a main load-carrying element and a lateral-support element. The axial forces are taken only by the main load-carrying element. The lateral-support element provides continuous lateral support for main load-carrying element to prevent the load-carrying element from buckling. The aim of this study is the application of BIBs in Self-Centering Steel Concentrically-Braced Frame Systems (SC-CBFs) and Truss-Girder Frame Systems (TGs). Software ANSYS was used to investigate the hysteretic behavior of the two systems. SC-CBFs consist of CBFs, prestress tendons, and BIBs. Gap-opening behavior at the bottom of these systems makes BIBs dissipate energy, and prestressed tendons will pull the structure back to its original position.The mainly parameters are pre-stress level, tendon extended length, strength in energy dissipated zone of BIBs, tendon areas, height-width ratio, increment of vertical loading, the location of prestressed tendons, and the part of columns replaced by BIBs in concentrically braced frame. Results obtained from this study are as follows : (1) pre-stress level, tendon extended length, strength of BIBs, tendon areas, and height to width ratio of frame are the parameters that affect the behavior of SC-CBF;(2) vertical loading can increase the strength of SC-CBF;(3) The vertical displacement of SC-CBF caused by lateral force is quite significant;(4) The frame with tendons installed in the middle of steel shear walls has the best hysteretic behavior;(5) The frame with tendons installed on the ends of steel shear walls can decrease vertical displacement of the column in the first floor;(6) Use BIB as column member in concentrically braced frame can decrease vertical displacement of the column. TG systems consist of columns and truss-girders. In this research we apply BIBs in truss-girders to improve ductility. Results obtained from this study are as follows:(1) It will be a better configuration to install BIBs on the bottom chords of both ends of truss girder in a frame;(2) BIBs on the bottom chords of both ends of truss girders in a frame cause the smaller displacement in the middle point of girders, and the structural behavior is better than that of ordinary moment resisting frames.
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