Study On Residual Bearing Capacity Of Thin-Walled CFST Columns And Steel Beam Joints Under Fire

As is known to all,steel structure has been used more and more in high-rise buildings and industrial workshops,but there is no special regulation on fire resistance design and post-fire evaluation method of thin-wall concrete-filled steel tube joints in relevant codes at present.Therefore,it is necessary to study fire resistance(including fire resistance and fire resistance)of concrete filled with lightweight steel-walled columns-jointed steel.Studying the residual bearing capacity of thin-walled concrete-filled steel tube columns and steel beam joints under fire is the basis for scientific fire-resistant design and performance evaluation after fire.This paper covers a small fence filled with metal fittings and a metal fence as research tools,including a small fence filled with circular metal fences,and the method used in this structure.He studied the effects of fire and fire at all times.The main research activity is as follows:The temperature field analysis of steel beam joints on thin-wall concrete-filled steel tube column under fire is carried out.Theory mainly includes thermal radiation,heat convection,heat transfer,on the basis of previous studies to make reasonable assumptions,Choose the right temperature gauges,including concrete thickness,fire temperature,and specific heat.Use the full ABAQUS simulation software to build a full-fledged wall full of metal and combined steel,and then analyze the temperature changes.Steel-filled steel with columns and steel holding under heat.rules and at 300 ℃ isothermal study section damage depth change rule.The effects of a fence filled with steel bars and steel beam joint on the temperature field under different parameters is established.The final factor in analyzing the model of a non-fire fire is its different size.A basic 15 mm lightweight model — surrounded by concrete filled with tube-column steel — jointed steel,20 mm and 25 mm coating for 180 min under fire was analyzed.The effects of various combustion methods on the heat field are analyzed.The temperature variation with time at different locations of the section of a 25 mm thin-wall concrete-filled steel tube column subjected to fire for 180 min was analyzed.Learn the remaining ability to transport concrete-filled concrete fences with a metal fence,set a common model for concrete-filled fences filled with steel fences with pre-and post-fire fences,and study the rules for pre-and post-fire fencing..