Research on Seismic Performance of Buckling Constrained Bracing in Prefabricated Steel Frame Buildings
To address the impact of connection methods on the seismic performance of multi-story prefabricated steel frame structures,the newly built Beixin'an Community Elderly Care and Disability Service Center in Shijingshan District was taken as the research object.Using indoor physical simulation methods,two different small scale models were established,including embedded and welded connections.The seismic performance indicators such as hysteresis curve,skeleton curve,stiffness curve,ductility,and energy dissipation parameters were compared.The results show that the hysteresis curves of both connection methods exhibit a full shuttle shape and have good energy dissipation performance;compared to welded connections,the buckling constraint support of embedded connections significantly increases the yield displacement,while the yield load decreases.The variation patterns of ultimate displacement and ultimate load are exactly opposite;the initial stiffness of the two connection methods is close,and the secant stiffness shows an exponential decrease with increasing displacement;under the same displacement,the specimens connected by embedded parts have greater secant stiffness,but smaller ductility coefficients;the energy dissipation coefficient and equivalent viscous damping coefficient of the embedded connection specimen are both about 0.81 times that of the welded connection specimen,indicating that the use of welded connection for buckling constraint support has superior seismic performance.
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