A DESIGN METHOD FOR STEEL FRAMES EQUIPPED WITH BUCKLING RESTRAINED BRACES
In this paper a design method for buckling-restrained braced steel frames is examined. The proposed method aims to obtain an uniform yielding of all Buckling Restrained Braces (BRBs), thus avoiding concentration of plastic deformation at some storey level. This is a critical point in the design since BRBs usually have very low hardening in post-elastic response, especially if they are used in steel frames with pinned joints. An optimal distribution of column stiffness and of brace stiffness can be preliminarily defined from the free vibration equations of an equivalent shear-deformable cantilever. This continuum model permits to obtain closed form solutions that can be adopted for the design of structures with regular mass distribution over the height. A similar procedure is directly applied to discrete models. An optimal solution for the equivalent SDOF system is achieved by using force-based or displacement based design approaches. Being the proposed method based on the first vibration mode, dynamic analysis are performed and discussed in order to evaluate the reduction of performance in the nonlinear range deriving from higher vibration modes.
Buckling restrained braces braced steel frames design method.
A. DallAsta L. Ragni A. Zona
Department ProCAm, University of Camerino, Ascoli Piceno, Italy DACS, Marche Polytechnic University, Ancona, Italy
国际会议
14th World Conference on Earthquake Engineering(第十四届国际地震工程会议)
北京
英文
2008-10-12（万方平台首次上网日期，不代表论文的发表时间）