Design and Analysis of Moment Connections Using Truss Analogy

本项目的目的是建立钢梁-柱连接分析的桁架类比方法，并开发钢抗弯矩框架焊接连接的新设计程序和详细实践。古典伯努利假说之后的现代钢结构建筑。梁的弯矩通过翼缘焊缝传递给柱，而剪力由剪力板承担，这隐含地假设梁在梁柱连接处的承载力与梁在跨内的承载力相同。然而，详细的模型分析表明，靠近剪切板的连接区域几乎没有应力，而法兰和法兰焊缝则出现了高应力集中。本文采用桁架类比方法建立了合理的梁柱连接力传递模型。该模型假设连接弯矩通过水平弦力传递，而连接剪力由对角支撑承担。在弯曲作用下，法兰焊缝将处于复杂的应力和过载状态。桁架类比方法表明，连接中的梁必然比跨中的梁弱。新的设计程序？是基于有理桁架的力传递模型。新的设计策略是通过增加弯曲和剪切加强单元来增加连接附近梁的承载力。已经进行了实现研究目标所需的分析工作。该项目侧重于验证桁架类比方法所需的实验研究，并完善提出的梁柱连接设计程序。总之，这些结果将为新接箍设计程序的全面验证测试和详细实践奠定基础。

The objectives of this project are to establish the truss analogy approach for analysis of steel beam-to-column connection and to develop a new design procedure and detailing practice for welded connections in steel moment-resisting frames. Modern steel buildings in the wake of the classical Bernoulli hypothesis. The beam bending moment is transferred to the column through the flange welds, while the shear force is taken by the shear tab, which implicitly assumes the capacity of the beam at the beam-to-column connection is the same as the capacity of the beam in the span. However, detailed model analysis showed that the area of the connection near the shear tab is virtually devoid of stresses, while high stress concentrations occurring the flanges and the flange welds. The truss analogy approach is used herein to develop a rational model of force transfer in the beam-to-column connection. The model postulates that the connection bending moment is transferred through the horizontal chord forces, while the connection shear is taken by a diagonal strut. Under bending, the flange welds will be subjected to a complex state of stress and overloaded. The truss analogy approach shows that the beam in the connection is necessarily weaker than in the span. The new design procedure ? is based the rational truss force transfer model. The new design strategy is to increase the capacity of the beam near the connection by adding a flexural and a shear strengthening element. Analytical work needed to achieve the research objectives has been carried out. This project focuses on the experimental research needed to verify the truss analogy approach and refine the proposed beam-to-column connection design procedure. Together, the results will form a base for full-scale proof-testing of the new connection design procedure and detailing practice.