【摘要】 提出了一种安全性高、成本低的新型摩擦"塑性铰"构造的概念和几何设计,以实现精准耗能和大震可修的延性设计抗震目标。以钢结构梁柱延性节点的设计理论为基础,推导了该构造的力学性能理论和工作机制,并应用于钢框架结构进行了静力弹塑性分析。通过ABAQUS有限元软件建立了5个工况的数值分析模型,进行了有限元模型的循环往复位移荷载分析,探究了新型摩擦"塑性铰"构造的抗震性能。结果表明:该构造模型仅发生了抗剪螺栓的剪切破坏,可实现其精准耗能和结构的快速修复;具有较好的转动性能,满足层间位移角要求;摩擦耗能随着旋转加载螺栓预应力和摩擦系数的增大而增大,其滞回曲线较饱满,延性系数较大,具有较好的抗震性能;理论分析和有限元分析的承载力基本吻合,分别为15.92 kN、15.84 kN;抗剪螺栓的剪切和纯摩擦耗能两阶段的等效粘滞阻尼系数分别为0.318、0.671,纯摩擦耗能阶段的耗能能力较好。在钢框架中摩擦"塑性铰"的形成与发展符合抗震性能要求,Pushover分析可作为结构抗震性能评估的有效方式。更多还原

【Abstract】 The concept and geometric design of a novel friction "plastic hinge" structure with high safety and low cost were proposed to achieve the seismic objective of accurate energy dissipation and repairable damage under large earthquakes. Based on the design theory of the beam-column ductility steel joint structure, the mechanical property theory and working mechanism of the structure were deduced, and the static elastoplastic analysis of the steel frame structure was conducted. Through the finite element software ABAQUS, the numerical analysis model of five working conditions were established, and the cyclic reciprocating displacement load analysis of the finite element model was conducted to explore the seismic performance of the new friction "plastic hinge" structure. The results showed that only the shear failure of shear bolt occurred in the model, indicating that it can realize the accurate energy dissipation and rapid repair of the structure. The model had good rotational performance, which can meet the requirement of story drift angle. The friction energy dissipation increased with increasing prestress and friction coefficient of the rotary load bolt. The bearing capacity of the theoretical analysis and that of the finite element analysis were 15.92 kN and 15.84 kN, respectively, basically agreeing with each other. The equivalent viscous damping coefficient of shear bolts in shear stage and friction stage were 0.318 and 0.671, respectively. The formation and development of the friction "plastic hinge" in a steel frame can meet seismic performance requirements, and the pushover analysis can be used as an effective way to evaluate the seismic performance of the structure.更多还原