Research On Flexural Performance Of RC Beams After High Temperature TRC Reinforcement

This thesis is mainly based on the mechanical properties of RC beams after high temperature,using different types of fiber woven mesh reinforced concrete TRC(carbon fiber woven mesh reinforced concrete,basalt fiber woven mesh reinforced concrete)to strengthen the RC beams after high temperature,and bending tests were conducted after the reinforcement was completed to investigate its effect on the flexural properties of RC beams and the reinforcement effect.The main contents are as follows:The flexural tests were conducted on RC beams after different fire temperatures(20°C,150°C,350°C,550°C and 750°C)with different number of layers(0,1 and 3 layers)of carbon fiber woven mesh reinforced concrete reinforcement,and the change of flexural properties of RC beams after high temperature TRC reinforcement with fire temperature and number of layers of reinforcement was investigated.The results showed that the flexural performance of RC beams with high temperature post-TRC reinforced with carbon fiber woven mesh showed a certain degree of decrease in ultimate bearing capacity with the increase of fire temperature,and the increase of bearing capacity with the increase of the number of reinforcement layers.The flexural test was conducted on RC beams after different fire temperatures(20°C,150°C,350°C and 550°C)with different layers(0,1 and 3 layers)of basalt fiber woven mesh reinforced concrete reinforcement,and the change of flexural properties of RC beams after high temperature TRC reinforcement with the fire temperature and the number of layers of reinforcement was studied.The results show that the flexural properties of RC beams with hightemperature post-TRC reinforced by basalt fiber woven mesh show a certain degree of decrease in ultimate bearing capacity with the increase of fire temperature,and the increase of the bearing capacity with the increase of the number of reinforcement layers.In order to evaluate the effect of different types of fiber woven mesh reinforced concrete after high temperature of RC beams,the test results of carbon fiber woven mesh reinforced concrete and basalt fiber woven mesh reinforced concrete reinforced concrete after high temperature of RC beams were compared and analyzed.The results show that for both types of fibers,the ultimate bearing capacity of the reinforced RC beams can be effectively improved,and the ultimate bearing capacity increases with the increase of the number of reinforcement layers.In order to obtain the calculation method of flexural load capacity of RC beam after high temperature TRC reinforcement,the test results of RC beam after high temperature reinforced with carbon fiber mesh reinforced concrete and basalt fiber mesh reinforced concrete are analyzed,and then based on the degradation law of material strength of RC beam after high temperature and the temperature field of member section simulated by ABAQUS,combined with the calculation formula of positive section reinforcement of flexural member under normal temperature environment,thus The calculation method of flexural load capacity of RC beam after high temperature TRC reinforcement is obtained,which can provide reference for practical application in engineering.