基于灌浆套管连接的装配式钢管混凝土柱-UHPC环梁节点抗震性能研究OA

To address the complex structure and casting challenges of the conventional concrete-filled steel tube(CFST)column-ring beam joint,a new prefabricated CFST column-ultra-high-performance concrete(UHPC)ring beam joint with grouted sleeve connections was proposed.Low-cycle reversed loading tests were conducted to evaluate the influence of axial compression ratio and ring beam concrete type on joint perfor-mance,with comparisons to the conventional monolithic joint.A finite element model was established and verified by experiments,and parametric analysis was performed.Results show that the new type of joint exhib-its two main failure modes:shear failure in the ring beam region concrete and plastic hinge failure at the beam end(steel profile cut-off region).The hysteretic performance of the proposed joint is comparable to the con-ventional joint.The use of UHPC instead of normal concrete effectively prevents shear failure in the ring beam.Increasing the axial compression ratio reduces hysteretic performance and ductility of the joint.The nu-merical simulation results are in good agreement with the experimental results,and the parametric analysis re-veals the effect of beam reinforcement ratio,ring beam concrete type,and axial compression ratio on the hys-teretic performance of the joint.The findings provide technical support for the safety design of this type of joint.