Seismic Performance Analysis Of Dry Connection Frame Structure With Buckling Restrained Braces

At present,most of the assembly architecture adopts the equivalent cast in place wet connection mode,which fails to reflect the advantages of the assembly architecture.It is necessary to develop the dry connected assembly structure,but the dry connection joints have the problems of insufficient energy dissipation and large lateral deformation.At present,most researches focus on components,and the seismic performance of the overall structure formed by dry connection is less.Therefore,it is necessary to investigate the overall seismic performance of the dry connected assembly structure,and propose improvement measures from the structural system levelIn this paper,three dry connection modes are selected to form two dry connection frame structures and compare with the cast-in-place structure,four kinds of strengthening measures are adopted,and their seismic performance are compared.According to the design idea of buckling restrained braced steel frame structure,the design method based on stiffness ratio of buckling restrained bracing frame structure is put forward,and the three-dimensional finite element model of buckling restrained braced dry connection frame structure is established.The stiffness ratio of the structure,the ratio of yield stiffness ratio and the arrangement of the support are analyzed.The suitable range of stiffness ratio,the yield stiffness ratio and the reasonable arrangement of support are studied.A number of earthquake records are selected to analyze the vulnerability of the structure,and the seismic capacity of the strengthened dry connection frame structure is assessed.The main conclusions are as follows:(1)Beam-column joints using PTED,column-column connected by steel plate hoop connection framework structure.its seismic performance and cast-in-place structure similar for the lower floor,with the increase of the number of floors,its seismic performance is lower than the cast-in-place structure.(2)Beam-column joints connected by steel bracket,column-column connected by steel plate hoop connection framework interlayer deformation is bigger,which need to strengthen measures,including the best effective buckling constraint brace.(3)The nominal stiffness ratio of the 6-layer and 12-layer buckling constraint brace frame structure is 0.5~2.0 and 0.25~1.6.The brace form is recommended to use the human font along the floor height of uniform layout.(4)In the 8 degree(0.2g)area,the six-layer used buckling constraint supports the dry type joint frame structure,and the probability of the structure in the two directions beyond preventing the collapse limit state is nearly 0.The probability of reaching the limit state of life safety was 1.61% and 1.69%,respectively.The probability of reaching the immediate limit state was 34.12% and 34.83%,respectively.