EXPERIMENTAL RESEARCH AND FINITE ELEMENT ANALYSIS ON SESIMIC BEHAVIORS OF Z-SHAPED BEAM-TO-COLUMN BOLTED JOINT WITH DOUBLE CONNECTION PLATES
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摘要: 为减小地震对梁柱节点的破坏并保证稳定的连接性能,提出一种双面连接的Z型全螺栓梁柱连接节点,并以刚性连接的设计理念设计了两组试件。对新型节点和传统节点试件进行了拟静力试验研究以及有限元对比分析,获得了节点的破坏模式、滞回曲线、骨架曲线、延性系数、耗能能力以及刚度退化等抗震性能。结果表明:双面连接的Z型全螺栓梁柱连接节点的破坏模式为梁柱连接处的悬臂梁段翼缘以及梁腹板的撕裂;该节点刚性连接稳定,盖板与梁翼缘无明显滑动,试件主要通过板件的屈服实现耗能;与传统连接节点相比,Z型节点具有更稳定的滞回性能,破坏的位移角限值更大;新型节点与传统连接节点承载力相近,其刚度退化趋势更为缓慢;Z型的连接构造使得节点有更大的塑性发展区域,能有效地提升节点的耗能性能、延性性能等抗震性能。Abstract: A kind of Z-shaped all-bolted beam-to-column joint with double connection plates was proposed. The two specimens were designed by rigid connection philosophy in the paper. The quasi-static tests and finite element analysis were conducted for comparative study between the novel joint and conventional joint. The failure modes, hysteretic curves, skeleton curves, ductility factors, energy-dissipating capacities and anti-seismic performances were obtained. The results showed that the failure mode of Z-shaped beam-to-column bolted joint was the fracture on cantilever-beam flange connected to the column, and the web of the beam; the joints were rigidly and steadily connected, and there were no obvious sliding between the cover plates and the beam flanges; the dissipate energy mainly of specimens depended on the yield deformation; compared with the conventional joint, the Z-shaped joint possessed more stable hysteretic performance and larger displacement angle of failure; the bearing capacity of the novel joint was similar to the conventional joint, and its stiffness degradation trend was more low; the novel joint had a larger plastic development area, which could effectively improve the energy-dissipation performance, ductility and other seismic behaviors.
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Key words:
- all-bolted /
- beam-to-column joint /
- quasi-static test /
- finite element analysis /
- seismic behaviors
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