Experimental Study and Optimization Analysis of Seismic Performance of Four-limb Concrete-filled Steel Tube Lattice Column-box Girder Joints
In order to investigate the failure characteristics and plastic energy dissipation performance of four-limb concrete-filled steel tube(CFST)lattice column-box girder joints,low-cycle reciprocating load tests were conducted on three different CFST lattice column-box girder joints.Load-displace-ment hysteresis curves and skeleton curves were obtained from the tests.Based on the tests,finite ele-ment models of four-limb CFST lattice column-box girder joints were established using ABAQUS,and the results were compared and validated with the quasi-static test results,showing good agree-ment.Optimization designs were conducted for the core region of the joints with different configura-tions,and the influence of factors such as the symmetry of the core region and different configurations on the energy dissipation capacity were investigated.The results indicated that the joints with a trans-verse diaphragm in the core region exhibited the best plastic energy dissipation capacity.The greater the symmetry of the core region,the higher the plastic energy dissipation capacity of the joint.The configuration of the core region had a minor influence on the stiffness degradation of the joint.Joints with different core region configurations showed significant residual deformation,demonstrating good plastic performance.The research findings of the tests provide reference for the seismic performance analysis of the core region of four-limb CFST lattice column-box girder joints.
万方数据
维普
