The Analysis Of The Fire Resistance At Nodes Connected With H Beam Web Plate

In the practical engineering application,Steel structure buildings have advantages such as light weight,fast construction period,precise construction,and good seismic performance.However,it has a fatal weakness,the poor high temperature resistance.Fire will cause tremendous damage to parts of steel structure building,especially the beam-column joints.The failure of the beam column joints of the steel structure beam at high temperature directly influences the instability of the overall steel structure.The joints of the beam-column webs in the steel frame structures are the important parts of the structure,and the fire resistance of the joints determine the fire resistance of the overall steel structure.In the application of theory and practice,the research of the joints of beam-column webs under high temperature has important significance.Domestic and foreign scholars have studied the overall steel frame,but relatively little research on the fire resistance of steel frame beam column joints,especially the research on the joints of the web joints.In this article,the fire resistance of beam-column web connections is analyzed by theoretical analysis and numerical simulation.The main researches are shown as follows:1.Point out the issue background and research significance and review recent research status of domestic and foreign.Meanwhile,the physical properties and mechanical properties of steels under the high temperatures at home and abroad are collected.2.Some theoretical derivations are given under high temperature,including the shear stiffness of steel frame beam-column joints,the equivalent shear stiffness of beam wing flange connection plate,bending stiffness of steel frame beam connection plate.3.According to the calculation examples,the internal force and stiffness change of steel structure field with different fire protection coating at beam-column nodes are calculated and analyzed under the high temperature.4.The web connections node of H-shaped beam and H-shaped column under high temperature is analyzed by finite element analysis using ANSYS.Internal force,deformation and first order buckling mode changes of steel frame beam-column joint under different burning time are analyzed.5.Simulation and analysis of high temperature critical force,high temperature critical uniform force,the critical shear of node field and ultimate bend moment of node field compared with results of theoretical calculation analysis.