Experimental Study On Shear Behavior Of Reinforced Concrete Continuous Beams Under Fire

The occurrence of building fire brings great harm to people’s life safety.It is necessary to design the building structure reasonably and scientifically to prevent the structure from being damaged in the fire and causing casualties caused by building collapse.Reinforced concrete continuous beam,as the main load-bearing component of the building structure,is widely used in various buildings,and the research on its fire resistance performance is particularly important.Therefore,the shear resistance of reinforced concrete continuous beam under high temperature of fire is tested and studied.The specific contents are as follows:1)Eight two span reinforced concrete continuous beams were tested under constant load and temperature rise to study the influence of different load ratio,thickness of concrete cover,shear span ratio,stirrup ratio and fire conditions on the shear performance and fire resistance of reinforced concrete continuous beams.2)Four reinforced concrete simply supported beams with different shear span ratio,thickness of concrete protective layer and stirrup ratio were tested under constant load and temperature rise,and compared with the reinforced concrete continuous beams with the same design parameters to analyze and compare the differences of shear performance and fire resistance limit between the reinforced concrete continuous beams and the reinforced concrete simply supported beams under fire and high temperature.The experimental results show that the shear performance and fire resistance limit of reinforced concrete continuous beam under fire are decreased with the increase of load ratio and shear span ratio,and increased with the increase of concrete cover and stirrup ratio.The fire resistance limit and shear resistance of single-span fired specimens are higher than those of double-span fired specimens.Under the same design parameters,the fire resistance limit and shear resistance of continuous beams are better than simply supported beams.Figure 72;Table 12;Reference 47...