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Research on the Design Theory of Buckling-Restrained Braces and Buckling-Restrained Braced Frames

Author: LiuJianBin
Tutor: GuoYanLin
School: Tsinghua University
Course: Civil Engineering
Keywords: Buckling restrained brace Constraints than Lateral stiffness ratio Braced steel frame Design Theory
CLC: TU391
Type: Master's thesis
Year: 2005
Downloads: 1399
Quote: 119
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Abstract


The choice of the lateral force resisting system is one of the key elements of a high-rise building structure selection. Lightweight, high strength of steel structure and the level of support frame lateral stiffness of major features, making braced steel frame in the seismic fortification area has a certain advantage. But ordinary support under seismic action there is buckling under pressure, the 1994 Northridge earthquake and the 1995 Kobe earthquake damage surveys show that ordinary braced steel frame earthquake due to repeated buckling of the support of the earthquake damage intensified. Buckling restrained brace ordinary support improved performance through the periphery of the ordinary support to set constraints on sleeve, inhibition of the buckling pressure support without restricting the free expansion of its force, support, whether under pressure or tension The total cross section of the yield. Rational design buckling restrained brace the rare earthquake occurs to be the first to yield hysteresis seismic input energy consumption, the protection of the main frame structure. First, the composition of the buckling restrained brace member theoretical research, given the stiffness and bearing capacity of anti-buckling constraints sleeve through global and local stability analysis, support connected to the frame section of the simplified calculation method. Comprehensive consideration of various nonlinear contact finite element software ANSYS simulation algorithm by the force of the support member in good agreement with existing experimental results. Analysis examines the ultimate bearing capacity constraint ratio, core thickness ratios, the initial defect, the gap parameters and connections rigid support performance of the reasonable value of the parameters. Single-layer single-span steel frame, braced steel frame and anti-buckling braced steel frame unidirectional ultimate bearing capacity and comparative study of the hysteretic behavior of three difference lies. Nonlinear time history analysis method of the multi-layer buckling restrained brace the dynamic performance of the steel frame, study support arrangement and support framework resistance to lateral stiffness than factors such as the impact of the seismic performance of buckling restrained braced steel frame. Buckling restrained braced steel frame seismic design method are discussed, based on the specification of response spectrum and seismic idea of ??the target displacement, buckling restrained braced steel frame the the simplified seismic calculation method, summed up the buckling restrained braced steel frames and buckling restrained brace design theory points.

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CLC: > Industrial Technology > Building Science > Building structure > Metal structures > Steel
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