Study on the Performance Detection and Analysis of Steel Structures After Fire in Large-scale Factories
Steel structures are widely used due to their material properties and construction advantages,but they are materials with weak fire re-sistance,so the inspection and identification of steel structures after fire is crucial.This paper takes a single-story steel structure factory build-ing that has experienced a fire as the research object,preliminarily determines the temperature field through the on-site residues,and then cor-rects it through calculation and draws the isothermal curve of the fire scene.Through the steel strength test,it was found that after water spray cooling,the strength of the steel increased significantly and the elongation decreased significantly.The deflection test showed that the deforma-tion of some components exceeded the evaluation requirement of Class C and reached 73mm.The maximum bending moment ratios of the steel beams at the Q～H/1 and Q～H/2 axes for bearing capacity analysis were 0.601 and 0.711 respectively,and were rated as Class D.
Steel structureDetection and identificationBearing capacity
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