The Analysis Of Behavior Of Beam-to-Column Web Moment Connections In Steel Frame

Steel structure is widely used in buildings in the world because of the light weight, excellent performance in earthquakes and the ideal ductility of steel. But during the 1994 Northridge Earthquake in America and 1995 Hyogoken-Nanbu Earthquake in Japan, steel frames were seriously damaged, and many of which were brittle fracture at the connections. This indicated the behavior of beam-to-column web moment connections should be further studied, and consequently arose the recognition of the structural engineering experts. The analysis on the behavior of beam-to-column web moment connections is not only significant from the theoretical aspect, but also important in practice.Based on the elastic and plastic mechanics, using the finite-element analysis, the nonlinear finite model of the beam-to-column is established according to the American code. The model involved geometry, material nonlinear and friction. The response of beam-to-column web moment connections under monotonous load is researched on. After comparing between the finite-element analysis and experimental results, the author verified the FEM.Then according to the Chinese code, the nonlinear finite model of the beam-to-column is established which are made of different size components. The responses of beam-to-column web moment connections which are made of different size components are compared and analyzed from three facets, and the conclusions about the joints behavior are drawn: thicken the connection plate, lengthen the connection plate or use a back-up stiffer can improve the connection behavior, consist of improving the behavior of load-supported and reducing the stress convergence in the flange moment plates. Then, suggestions about the design of the beam-to-column web moment connections are put forward.In conclusion, the finite-element model and the program adopted in this paper canwell simulate the response of beam-to-column web moment connections under monotonous load. The study is rather systematic. The conclusion and design recommendations are very useful for instruct the project. This article established the basis of further studies.