Study On Elastic-Plastic Properties And Thermal Properties Of Semi-rigid Connection Steel Frame

In steel frame beam-column connections play a vital role in transferring bending of moments and shearing force, and their behavior affects steel frames overall performance under loads. Making a thorough research on the mechanic performance of beam-to-column connections possesses important theoretic and engineering reference value. In this paper three l:2-scale steel frame specimens and eight full-scale steel frame connection specimens are tested on their behavior under cycle loading. There are several aspects as below on the problems of steel resident building researched:1 ,Pseudo-static force testing of 1:2 scale models including two steel frames with semi-rigid connections is first carried out in China in order to obtain elastic-plastic behavior of semi-rigid connections steel frame under cyclic loading as well as to analyze collapse characteristic after structural ultimate strength has lost and the coming order of plastic hinges. The internal force and the horizontal displacement of a steel frame are computed with the program in this paper. After the analysis results are checked against the experimental results and, it is founded that a satisfactory agreement is obtained in elastic phase and a discontented agreement is gained in plastic phase since the influence of residual stress, degradation of cross-sectional stiffness and the spread of plastic zone length cannot be taken into account in plastic hinges theory.2 , Pseudo-static force testing of 1:2 scale models of a steel frame with dog-bone connections and top and seat angles with double web angles semi-rigid connections and extended-end-plate semi-rigid connections and dog-bone rigid connections are first carried out in China. The relations of M - θ_r, the yield strength, failure models, ultimate strength and characteristic of dissipation of energy were gained in this experiment. The influence of dog-bone rigid connection on the coming order of plastic hinges and failure characteristic of steel frame is obtained.3, According to the finite-deformation theory of the nonlinear continuum mechanics and Prandtl-Reuss theory as well as the principle of functional minimum potential energy, in combination traditional beam-to-column method with finite element method, by introducing stiffness coefficient P_s and plastic-deformation...