The Research On Mechanical Behavior Of Steel Frames With Semi-rigid Connections

At present, the seismic-resistant performance has been studied. However, most of these researches focus on the stress performance of the component and joints. Therefore, this paper embarks from the frame's whole seismic-resistant performance, thoroughly and systematically studies the various parameters'influence to the seismic-resistant performance of the steel-frame constructions with semi-rigid connection,by even better coordinates the relationship between the structure's strength, rigidity and ductility has the extremely important practical significance regarding the instruction design work.This paper applies material nonlinear and geometry nonlinear finite element method to systematically analyze the overall behaviors of steel-frame constructions the semi-rigid connection under cyclic load. The load-bearing condition of the steel frames construction with semi-rigid connection in a variety of situations was really simulated through the calculation and analysis of many series test samples. The major parameters including constant axial compression ratios,length of beam, terminal plate thickness and different frame joint are studied. The main conclusions are: The steel frame witn semi-rigid connect under the cyclic load function in the frame trestle end spot the first local buckling, will then be the frame trestle foot flexure forms the plastic hinge; In the structural design should guarantee that the frame Liang end weld the effective connection, through the structure measure guarantee foundation paired columns foot's good restraint. The steel frame P-Δeffect is very obvious in vertical and under the horizontal load's combined action, suggested that compares the control the axis pressure about 0.6.Increaseing terminal plate thickness to enhances the test sample earthquake resistance performance to be quite obvious, looking from entire stagnates the curve is quite full, but along with increase of the terminal plate thickness, stagnates the curve the full fullness slightly to hasten increases, but this tendency is getting more and more weak. Therefore choice reasonable terminal plate thickness may satisfy the beam column joints variously the request, and may save the steel products.This article establishes the finite element models consideration question is more comprehensive, the precision is high, can real simulation the steel frame with semi-rigid connect under the cyclic load behavior.The study analyzing the semi-rigid connection steel-frame constructions'load-bearing performance in a rather comprehensive and systematic way are very useful for revising design specifications and guiding design of engineering. This paper will play a basic role in the further study on steel-frame constructions and analyzing the seismic-resistant behavior of whole structure.