| The high-strength reinforcement structure with specially shaped column has flexible spatial layout,but the joint core area is broken easily under earthquake action.To improve the bearing capacity and the seismic capacity of the node,the X-shaped reinforcement was added in the joint core area,and the enhanced effect about seismic behavior was researched,which proved test basis and theoretical basis for further generalization and.The exterior joints of specially shaped columns with high-strength reinforcement,and with or without X-shaped reinforcement were tested under low cyclic loading.The damage characteristic,steel strain,hysteretic behavior,bearing capacity,displacement,ductility,stiffness degradation and energy dissipation capacity were compared.It is shown that for the exterior joints of specially shaped columns,the ultimate bearing capacity of the joint with HRB500 is lower,but the hysteretic behavior,deformability,energy dissipation capacity are increased,the stiffness degradation is postponed.For the two kinds of specimens with different high-strength reinforcements,the shears of the core region were born by the X-shaped high-strength reinforcement,and the steel strain of the web which is distributed in the joint is increased,the failure characteristics of the joint is improved,the stiffness degradation is postponed,the deformability,shear capability and energy dissipation capacity are increased,so the seismic behavior of specially shaped column joints is improved significantly,and the seismic behavior of the joint with HRB500 is improved more.The numerical simulation of the exterior joints of specially shaped columns with high-strength reinforcement was carried out by using ABAQUS finite element model,and the characteristic points of the simulation are in good agreement with the experimental results,so the applicability of the finite element model is further verified,which provides model basis for further study. |
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