模块化钢框架模块间全螺栓拼接节点力学性能分析
Mechanical Performance Analysis of Fully Bolted Spliced Joints in Modular Steel Frame Structures
文中提出了一种新的模块化钢框架模块间全螺栓拼接方法,通过模块间连接键、单向螺栓与对穿螺栓的协同作用实现了模块间全螺栓装配。为研究该拼接节点的力学性能,采用ABAQUS有限元软件建立了模块化钢框架模块间全螺栓拼接节点精细化数值模型,并对其进行了低周往复加载数值模拟,分析了该节点的滞回曲线、骨架曲线、延性、耗能及承载力性能;还建立了节点初始转动刚度计算模型,推导了节点初始转动刚度计算公式,并与数值模拟计算结果进行了对比验证,验证了初始转动刚度计算公式的准确性。结果表明:该全螺栓拼接节点的构造设计合理,梁端角键起到加强节点刚度的作用并能引导梁端塑性铰远离节点核心区的方向外移,实现节点的延性破坏;节点模型的滞回曲线均呈饱满的梭形,具有较强的耗能能力;节点模型的层间位移角和延性系数均满足规范限值要求,抗震性能良好;增加模块间连接键板厚与梁端角键板厚能有效提高节点的初始转动刚度。
A novel approach for fully bolted splicing between modular steel frame modules is proposed, which achieves the all-bolt assembly through the inter-module connecting keys, blind bolts, and through bolts. To investigate the mechanical properties of this spliced joint, a refined numerical model of the fully bolted spliced joint between modular steel frame modules was established using the ABAQUS finite element software. Low-cycle reversed loading simulations were conducted to analyze the hysteretic curve, skeleton curve, ductility, energy dissipation and bearing capacity of the joint. A computational model for the initial rotational stiffness of the joint was proposed, and the corresponding formula was derived. The accuracy of this formula was subsequently validated through a comparative analysis with numerical simulation results. The research findings indicate that the design of the fully bolted spliced joint is structurally rational. The corner keys at the beam ends enhance the joint stiffness and promote the outward migration of plastic hinges at the beam ends, enabling ductile failure of the joint. The hysteretic curves of the joint specimens exhibit a full spindle shape, indicating strong energy dissipation capabilities. The inter-story drift angles and ductility factors of the joint specimens both meet the relevant seismic design requirements, demonstrating good seismic performance. Increasing the thickness of the connecting key plates between modules and the corner key plates at the beam ends can effectively improve the initial rotational stiffness of the joint.
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国家自然科学基金(52078258)
国家自然科学基金(52208175)
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