Purposes A novel type of prefabricated replaceable joint with beam flange openings is proposed to effectively prevent brittle damage at beam-column joint of steel beams and facilitate rapid post-earthquake structural repair. Methods A numerical simulation study was conducted to investigate the seismic performance of the new joint by utilizing the finite element analysis software ABAQUS. First, the accuracy of finite element model was verified. Second, the seismic performances of new joints, conventional beam-column welded joints, and prefabricated splice joint with unweakened steel beam under cyclic loading were compared. Finally, a variational parameter analysis of the new joint was performed to investigate the effect of the opening radius and the number of openings on the seismic performance of the proposed joint. Results The results demonstrate that the new joint can efficiently transfer plastic hinges to replaceable beams, and that beam-post joints remain elastic under seismic action and can be easily replaced after earthquakes. As the opening radius increases, the joint load capacity gradually decreases while the energy dissipation capacity increases. However, both stiffness degradation and ductility coefficient are unsatisfactory. The recommended radius of the opening should be 0.26 times the outward width of the beam flange. As the number of openings increases, the joint load capacity decreases slightly and the stiffness degradation rate does not increase significantly. The complexity of the processing technology necessitates a recommendation for 4 openings, which can effectively ensure the joints energy dissipation capacity and provide sufficient ductility.
钢支撑是钢框架-支撑结构中重要的抗侧力构件,研发新型支撑对改进结构的抗震性能具有重要意义.本文以15层钢支撑框架结构为研究对象,采用屈曲约束支撑(BRB)和牺牲-耗能支撑(SED)对比分析结构的抗震性能.弹塑性分析结果表明,BRB始终保持着较高的屈服后强度,结构中与支撑相连的梁、柱在后期承受了附加的轴力,增加了主要结构构件耗能的比例.牺牲-耗能(SED)支撑在达到峰值荷载后,其牺牲元件退出工作,承载力得到有控制的降低,减少了相连框架柱后期所受轴力,使得主结构中的塑性铰得到了一定程度的减少,进而主动吸引更多地震能量消耗在支撑中,达到了在强震作用下更好保护主体结构的目的.
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为了探究钢筋增强ECC-普通混凝土组合桥墩的抗震性能,基于ABAQUS对7个组合桥墩和1个普通混凝土桥墩的拟静力试验进行数值模拟,研究墩身材料、配筋率、剪跨比、轴压比、钢筋笼位置及ECC包裹层厚度对桥墩骨架曲线、变形性能、耗能能力、刚度退化及残余位移的影响.模拟结果表明:组合桥墩全面优于普通混凝土桥墩,能有效提高桥墩的强度与延性,进而提高桥墩的抗震性能;提高配筋率可以提高组合桥墩的承载能力与变形性能,但是对刚度退化与残余位移影响不大;剪跨比对组合桥墩的延性影响较大,提高剪跨比虽能增强桥墩变形能力,但降低了桥墩承载能力;轴压比对组合桥墩的影响与剪跨比相反,增大轴压比提高了桥墩的承载能力,却降低了其韧性;ECC包裹层厚度对组合桥墩的峰值荷载影响不大,对桥墩韧性有一定的影响;将钢筋笼置于普通混凝土,不能充分发挥钢筋笼的性能,降低了桥墩的抗震性能.
