Experimental Research And Numerical Simulation On Fire Resistance Performance Of R.C. Frame Structure With Seismic Damages

At present, two methods were often used to analyze the structural fire resistance performance such as experimental study and numerical simulation analysis. The data on deformation and failure process about structure were recorded by experiment which made a reference for numerical simulation analysis. Extensive studies on variable parameters were carried out based on numerical simulation analysis, which provided optimized calculation results for structural fire resistance performance.The law of temperature field and bearing capacity about section were selected as the main research object. Three concrete frame structures were designed, two of which were undertaken to elevated temperature with damages caused by earthquake, and the other was selected as the comparision. The main research content was as follows:1) The concrete structural performance and influencal factors under fire were analyzed comprehensively which were divided into three aspects-material, member and structure.2) Thermal and mechanical properties of concrete and reinforced bar were reviewed comprehensively and so the heat-force constitutive relation and material parameters were determined.3) Experimental research on thermal behavior for three R.C. structures with damages caused by earthquake was undertaken.4) The law of temperature field and bearing capacity about section for R.C. frame structure with damages caused by earthquake due to elevated temperature were analyzed.5) The dangerous section of frame structure beam and column was obtained according to the comparision between experiment results and numerical calculations, at the same time ,the relationship between damage index w which was defined as concrete crack and bearing capacity was put forwad as well.