Application And Optimization Of Buckling-Restrained Brace In Reinforcement Engineering

In order to implement the concept of green development proposed in 13th Five-Year Plan, some old low layer or multi-layer architecture although has been unable to meet the needs, for example, the function of people’s production and life, but it can not be a simple and brutal demolition, instead the need to implement the reinforcement of housing. The transformation of the housing must conform to the existing seismic code, so under the premise of meeting the function, the structure need to be reinforced. Buckling restrained brace reinforcement provides a new method for housing reinforcement renovation project. It can not only provide great lateral stiffness and bearing capacity for the structure, but also have the deformation ability and full hysteretic behaviors, playing a "fuse" role in the rare earthquake. This paper will use the light steel adding storey, an actual project which does not meet the seismic requirements as an example, and adopt the target displacement based method of buckling restrained braces in seismic design. The main research contents are as follows.Firstly, buckling restrained brace system design method is derived based on the target displacement by use of the relevant principles, and a lightweight steel adding layer engineering instance is completed to support the design. And the paper puts forward two support arrangements.Secondly, the analysis of comparing the elasticity of the whole structure shows that buckling restrained brace can provide the effective lateral stiffness to the structure, and each layer displacements are limited to the certain extent, and torsion of the structure is also improved. In addition the original distribution of the floor shear frame structure values decrease, the effective protection of the main structure is not destroyed by the earthquake.Thirdly, the comparative analysis of the overall structure of the elastic plastic shows that the structural displacement has been limited effectively after setting up buckling restrained brace, and elastoplastic layer drift angle can meet the requirements of specification, while supporting also bear the majority of seldomly occurred earthquake under the floor shear, and buckling restrained brace can precede beam column to yield point, in the plastic stage, playing a role in energy dissipation, being the first line of defense in aseismic structure.Finally, to optimize the design of buckling restrained braced structure system with displacement limit value as constraint condition, the original target displacement method is improved to realize the optimization of the supporting area of solutions. The improved brace steel quantity is greatly reduced, under the premise of ensuring the structural safety, getting the higher economic benefits. In addition all hold the proportion of the energy can be improved than the original scheme.