The Seismic Design Of Buckling-restrained Braced-reinforced Concrete Frame Structures Based On Shear Force Ratios Using Code-conforming Requirements

In recent years,buckling restrained brace has been widely applied in engineering,for the buckling restrained brace structures,many design methods are put forward at home and abroad,but most of the previous design methods assumed that the BRB bear all the lateral loads and seismic forces,This assumption ignores the lateral resistance and energy dissipation of the frame structure,which is not consistent with the real force system.Other design methods are mostly aimed at the research of steel structureand and different scholars give different suggestions,the key parameters are wide.Based on the characteristics of concrete frame structures,an integrated seismic design method based on shear ratio is proposed in this paper.The purpose of this paper is to give the design process and the loss assessment of the structure.So as to provide references for engineer's design and owner's decision.The mechanical properties of BRBs are studied in this paper,the hysteretic behavior of BRBs is compared with the actual test by numerical simulation,and according to the comparison of hysteretic performance,the reasonable simulation unit for BRBs is selected.The influence of maximum tensile force and maximum pressure on the structure and the nonlinear property of concrete are derived in this paper,and the structure design process is given in this paper.Through the design method and the standard requirements,the 5,10 and 15 layer structures under seven shear ratio(0.1,0.2,0.3,0.4,0.5,0.6,0.7)are designed and analyzed.The relationship between the shear ratio and the maximum interlayer displacement angle,the shear ratio and the hysteretic energy,the shear ratio and the maximum axial compression ratio,the actual shear ratio and the design shear ratio are obtained by the dynamic time history analysis.It is proved that buckling restrained brace in SAP2000 can simulate the performance of buckling restrained brace reasonably through Wen unit than plastic hinge element.The validity of the proposed integrated design method is verified by large sample elastoplastic analysis.and gives the range of the proposed shear ratio: 0.3~0.5,which effectively reduces the value space of the shear ratio,and the integrated design process provides an effective reference for the engineer's design.In order to study the rationality of the integrated design method,the performance-based seismic engineering theory is also introduced.The performance based loss assessment is carried out for the 5 layer structure designed by the integrated design method.Through the loss assessment,the design method of this paper can not only provide effective damping effect but also provide considerable economic benefits for the structure and provide reference for the owner's decision.