隔板贯通式箱型柱（边柱）-箱型梁节点抗震性能研究-结构工程专业论文.docx

宁波大学硕士学位论文 Research on the anti seismic behavior of diaphragm-through joints of box-column and box-beam Abstract Low-cycle reversed loading tests were performed on inner diaphragm joints of box column- box beam, including five joints with polyline enlarged juncture and opening holes at beam flanges (Hereinafter referred to as the improved joints) and one conventional joint．Studied the influence of polyline enlarged juncture and opening holes at beam flanges on destruction mode, hysteretic performance, capacity, plastic rotation, stiffness degradation and energy dissipation behavior and other effects of seismic performance of these modified joints. The test results show that, for the conventional joint ， butt weld at beam flange appears brittle fracture and the plastic rotation is about 0.010rad, the plastic rotation of joints with polyline enlarged juncture near butt weld and opening holes at beam flanges increases by 150%～250% compared with that of conventional joint, and the loading capacity increases by 36.3%～62.9%. We proposed correction factor of fracture index CI considered with weld defect, based on the comparation of numerical analysis results of ellipsoid yield model of structural steel and experimental results. Finite element parametric study was conducted on improved joint, analyzed the influence of beam-extended partition parameter L, diameter parameter of opening holes at beam flanges beam flange D and other parameters on the force performance. The results show that the loading capacity increases when the parameter L increases and the parameter D decreases; Plastic rotation increases as the parameter L decreases and decreases when the parameter D increases; The envelope area of hysteresis curve of improved joint increases by 107 ～ 250% compared with that of conventional joint, and the equivalent viscous damping factor increases by 8 ～ 61%, indicate that energy dissipation behavior of improved joint is significantly better than conventional joint. Consid