Finite Element Analysis Of Widen Flange Section And Side-Plate Reinforced Section Of Steel Frame

Widespread and unpredicted brittle fractures have been found in weld steel beam-column connections (weld-flange-bolted-web connections) of steel frames shaken during the Northridge earthquake and the Kobe earthquake. Such fractures were most often initiated at the bottom flange weld and propagated into the column flange and the beam web. The post-earthquake studies have shown that the traditional seismic behavior of beam-column connections is not good becauseof the brittle failure prevents the welded moment connections from exhibiting the inelastic behavior expected. Extensive experimentally and numerically studies were therefore conducted to the improved beam-column connections in the worldwide.The beam-to-column connection with beam-end horizontal haunch is a kind of reinforced beam-to-column which is one of the typical forms to move plastic hinge outward from the beam and column interface connections. It includes two categories of connections. One of the two categories is the side plate-reinforced section. The other category is the widen flange section. By widening beam flanges, the plastic hinge will form the welds that have much fracture proneness due to stress concentration and welding sensitivity, reducing the damage of brittle fracture of connections and improving the ductility of the structure.numerical analysis of widen flange section and side-plate reinforced section including two aspects:1. According to the test side in widen flange section and side-plate reinforced section, the establishment of the node that corresponds with the experimental three-dimensional finite element model, ANSYS finite element analysis software using the test model was under cyclic loading finite element analysis, and test results are analyzed and compared with finite element analysis verified the accuracy and reliability, and in accordance with Japan's "steel construction with the Department of Design Guidelines" side of box column section to establish enhanced node model, the cyclic loading in the bearing capacity of plastic hinge formation and development of law, distribution and location of plastic hinges, hysteretic behavior, ductility, and other aspects of research, so as to box column side-plate reinforced section provide a theoretical analysis of the design of the node basis.2. Ansys finite element software have established widen flange section and side-plate reinforced section models,under cyclic loading carried out three- dimensional nonlinear finite element analysis, Section of the beam flange of the starting position to expand, expand the width of the flange length parameters on the node to expand the force, the plastic hinge distribution and failure modes of specimens, ultimate load, maximum plastic rotation, hysteretic behavior and other effects, inductive prediction occurrence of the plastic hinge location, widen flange section and side-plate reinforced section parameters of the recommended reference value is given.The research results for the seismic design of steel frame and discuss the new node in the form provided valuable analysis and reference。...