Analysis And Evaluation Of The Mechanical Property Of Reinforced Concrete Structure After Fire

Reinforced concrete frame-shear wall structure have been widely used in construction projects due to high bearing capacity, excellent seismic performance and fire resistance performance. Structure material performance would make different degrees damaged due to the fire exposure, which led to the loss of bearing capacity of the key bearing component,triggered the collapse of the structure damage. Therefore, it is necessary to investigate the fire resistance performance of reinforced concrete frame-shear wall structure. Based on the background of the fire detection and evaluation of reinforced concrete frame-shear wall structure, this paper developed a finite element model to study the fire resistance of reinforced concrete beam and column components under different fire scenario. The calculation results should provide a reference for the structure fire resistance design. The main research work includes:(1) The fire performance of reinforced concrete frame-shear wall structure were tested and evaluated after exposure to fire. In order to study the damaged structure after fire and the loss of carrying capacity, through the fire investigation, including field residues situation, the fire process, investigation structure damage severity appearance. According to the component surface and internal appearance characteristics, temperature and structural damage once reached for rating for the damaged structure. Meanwhile, reference structure calculation result determination after the fire the actual bearing capacity and damage of building structures,provide a basis for structure damage component maintenance and reinforcement.(2). Based on the determination of concrete and steel thermal model, the temperature field model of CFST columns to composite beam frames under heating and cooling phases were developed due to accurate boundary conditions and meshing. The temperature distributions of columns and composite beam were studied based on finite element model(FEM).(3). According to the scene of the fire detection and evaluation, the most serious fire damage fire resistance analysis of reinforced concrete member. Reinforced concrete members temperature field was analyzed accordance with the ISO-834 standard heating curve. Component section temperature distribution and temperature-time curves were calculated in FEM. Fire-resistant performance and failure mechanism of reinforced concrete members was studied, and compared with the test results analysis, provide a reference for this kind of structure fire resistance design.