半刚性节点初始刚度的组件式计算模型

为了简便、准确地模拟半刚性梁柱节点的力学性状,在欧洲规范（EuroCode3）组件方法的基础上,建立各种荷载模式下T型件的组件式模型,并通过将梁柱半刚性节点等效为一系列T型件的组合,建立由一系列等效弹簧与杆件组成的半刚性梁柱节点的组件式计算模型.与EuroCode3相比,该方法的特点在于以T型件为基本分析单元,采用单个弹簧代替多个弹簧来模拟每个T型件.结果表明,T型件的拉力-位移关系曲线与精细数值计算、试验成果吻合良好,且计算的梁柱节点初始刚度、弯矩-转角关系曲线与试验值很接近,验证了本文方法的正确性.

Study on the component-based model of semi-rigid beam-to-column joints initial stiffness

In order to simulate the mechanical properties of semi-rigid beam-to-column joints conveniently and precisely, an initial stiffness calculation method was proposed in this paper based on the component method of EuroCode3. A T-stub model was set up and systematically verified. And the semi-rigid beam-to-column joint could be simplified with a set of T-stubs. Through that simplification, the semi-rigid beam-to-column joint was simulated with a series of equivalent springs and bars. Compared with the Eurocode3, the present method in this paper is based on a set of T-stubs and using a single spring instead of several springs to simulate the each corresponding T-stub. It is demonstrated by the T-stub example that the calculated load-displacement curve fits well with the numerical result and the experimental result. Furthermore, the semi-rigid beam-to-column joint responses calculated by the proposed method show a good accordance with the experimental initial stiffness and moment-rotation relation, which verify the correctness of the present method．