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在钢结构门式刚架设计中,通常采用节点理想铰接或刚接的简化分析方法。但实际上梁柱节点具有一定刚度(即半刚性),这种简化方法不能反映节点的实际性能。20世纪开始逐渐出现了半刚性节点的分析方法,从最初的转角-位移方程和力矩分配法到刚度矩阵法,直至现在的融合整体和节点结构分析的迭代法。研究表明,框架分析中应该考虑节点转动性能,通常采用弯矩-转角曲线来描述。为确定节点的力学性能,可采用分析模型、经验模型、试验模型、力学模型、数值模型等,其中力学模型应用最普遍。介绍了各模型的优、缺点及主要特征。分析半刚性连接框架时必须模拟节点性能,这就与弯矩-转角性能的数值模型有关。基于分析模型,可输入弯矩-转角特性,包括:线性、双线性、多线性和非线性特性。虽然在力学模型中多采用多线性特性,但最准确的还是连续非线性特性。综述了钢节点研究的3个方面:1)半刚性节点分析方法;2)节点力学性能分析方法;3)弯矩-转角数值分析方法。
In the design of steel frame portal frame, simplified analysis method of node ideal hinged or rigid connection is usually adopted. But in fact the beam-column node has a certain stiffness (ie, semi-rigid), this simplified method can not reflect the actual performance of the node. From the beginning of 20th century, the method of analyzing semi-rigid joints gradually emerged. From the initial angle-displacement equation and moment distribution method to the stiffness matrix method, up to the present iteration method of fusion overall and node structure analysis. The research shows that the turning behavior of the joints should be considered in the frame analysis, which is usually described by the moment-rotation curve. In order to determine the mechanical properties of joints, the analysis model, empirical model, experimental model, mechanical model, numerical model and so on can be used. Among them, the mechanical model is the most common. The advantages and disadvantages of each model and the main features are introduced. The analysis of the semi-rigid connection frame must simulate the node performance, which is related to the numerical model of the moment-rotation performance. Based on the analysis model, you can enter the moment-rotation characteristics, including linear, bilinear, multi-linear, and nonlinear characteristics. Although the use of multi-linear model in the mechanical properties, but the most accurate or continuous nonlinear characteristics. The three aspects of steel node research are summarized: 1) semi-rigid node analysis method; 2) node mechanical properties analysis method; 3) bending moment-rotation angle numerical analysis method.