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Research on the Design Methods of Assembled Buckling-Restrained Braces

Author: JiangLeiZuo
Tutor: GuoYanLin
School: Tsinghua University
Course: Civil Engineering
Keywords: assembled buckling-restrained braces design methods restraining ratio buckling-delayed reinforced members
CLC: TU352.11
Type: Master's thesis
Year: 2010
Downloads: 185
Quote: 2
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Abstract


As excellent energy-dissipating members, the buckling-restrained braces (BRBs) are accepted and widely used in some developed countries, and recently come into use in some engineering projects in China. In this paper a series of assembled BRBs are proposed, to promote the development of BRB technology in China. Based on the theory of common BRBs, researches are carried out on these new types of assembled BRBs, to investigate their possible failure modes and suitable design methods.Firstly, elastic theory for common BRBs is derived from its elastic buckling equation, including the elastic buckling load, the buckling mode, and the isolated load conditions of core subassembly and restraining subassembly. For common BRBs, the concept of restraining ratio is proposed to design the restraining subassembly. If restraining ratio is enough, overall buckling will not occur before the core subassembly of a BRB yields. Controlling equation of restraining ratio is also suggested, and different type of BRBs can use the same equation only with changing of parameter values in the equation accordingly.And then the design methods of single-core BRBs assembled with section steels are researched. With the help of a series of finite element examples, the mechanical behaviors of this type of BRBs are investigated, and the parameters in controlling equation of restraining ratio for this type of BRBs is fixed. Besides, taking single-core BRBs assembled with section steels as an example, the design methods of connecting subassembly of assembled BRBs are proposed, including the strength verification of connectors and controlling distance between connectors.In the same way, the design methods of another two types of assembled BRBs, which are double-core BRBs assembled with section steels and BRBs assembled with dual ribbed rectangular hollows, are obtained. The same parts with single-core BRBs are stated shortly, and the emphasis is put on the different parts from single-core BRBs, which is load-transfering pattern of bolts for double-core BRBs assembled with section steels, and failure mode of local buckling between ribbed panels for BRBs assembled with dual ribbed rectangular hollowsBesides, the concept of buckling-delayed reinforced members (BDRMs) is put forward in this paper for the first time. As the extension of BRBs,BDRMs can enhance their ultimate bearing capacities by using restraining subassembly outer, especially suitabe for reinforcement of existing structures. Based on the research results of BRBs and sufficient numerical results, the proposed formula for predicting ultimate bearing capacity of BDRMs is achieved, as the chief content of design methods for BDRMs.As listed above, the design methods of assembled BRBs or BDRMs are the main content in this paper. Finally, some researches about BRB frame construction are carried out. In the construction of BRB frames, initial stress will exist in the BRB members because of vertical compression, and it is necessary to evaluate the influence of such initial stress on the BRB members and frame systems, to provide some reference for engineering application.

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CLC: > Industrial Technology > Building Science > Building structure > Special Structure > Anti - shock structure,disaster prevention structures > Shock, isolation, and explosion-proof structure > Seismic structure
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