Energy Dissipation And Seismic Performance Analysis Of A Frame Structure Strengthened With BRB

In response to the demand for green building development in 13 th Five-Year.For some old buildings,it can not be simply demolished,through the reinforcement and other structural measures to reconstruct the original structure.The results of elastic analysis and elastic-plastic analysis of the strengthened structure must conform to the current seismic design code.There are many kinds of reinforcement measures for building structures,For example,carbon fiber cloth reinforcement technology,column outsourcing steel reinforcement technology,increase section reinforcement technology and so on.This paper introduces a new type of building reinforcement technology,namely buckling restrained brace reinforcement technology.The reinforcement technology can not only improve the lateral stiffness and bearing capacity of the reinforced structure compared with the original structure,but also has excellent hysteretic performance and strong deformation capacity,it can take the lead in yielding to protect the main structure and play the role of "fuse".In this paper,a strengthening project is taken as an example,and buckling-resistant members are used to reinforce it,so that it can meet the requirements of seismic design.The specific research contents are as follows.Firstly,the design method and development process of buckling-resistant members are introduced,and the reinforcement scheme of buckling-resistant braces for the original structure is proposed.Then,the elastic analysis and comparison of the original structure and the strengthened structure,it can be seen that some of the seismic performance indexes of the original structure can not meet the requirements of the seismic code,and the lateral stiffness of the strengthened structure has been significantly increased,so that the lateral displacement of the strengthened structure has been significantly controlled,the vibration mode of the structure has also been significantly improved.Besides,the floor shear force allocated by the structure is also reduced,and the structure of the main body of the protection is free from earthquake damage.Finally,the static elastic-plastic analysis and nonlinear time-history analysis of the original structure and the strengthened structure,it is concluded that the displacementof the strengthened structure is effectively limited compared with the original structure in terms of structural displacement,and the elastic-plastic displacement angle between layers also meets the requirements of the code,and under rare earthquakes,buckling-resistant braces can be used first.It achieves the yield bearing capacity and plays a role of energy dissipation.