Study On The Bearing Capacity Of Reinforced Concrete Beams With Embedded Prestressed BFRP Bars

Basalt fiber reinforced bar(BFRP)is composed of basalt ore drawing after high temperature melting of basalt fiber as reinforcing material,and using the synthetic resin as the matrix material,add some auxiliary reagents after extrusion process and surface treatment process to form a composite reinforcement material,is recognized as a new environmental protection material,has the character such as light weight,high strength and low price,the current in the field of civil engineering application prospect is very broad.BFRP bar performance fine,on its strength,construction ultimate tensile strength is much higher than ordinary steel,and glass fiber and high strength steel wire close to,and the thermal expansion coefficient and steel bar and concrete,mechanical body can be very good.However,the elastic modulus of BFRP bars is small,and its stress-strain curve is close to the straight-line unyielding point.In the process of tensile failure,there is no obvious yield stage and characteristic,and the deformation is large.Therefore,it is very significant to apply prestress before force,to improve the bearing capacity,to control the crack development and to improve the utilization efficiency of the reinforcement.At present a lot of experts and scholars in the prestressed CFRP reinforcement reinforcement of reinforced concrete beam with comparatively abundant research results,for the reinforced concrete beam strengthened with prestressed BFRP reinforced mechanical properties of the probe is relatively small,so therefore of prestressed BFRP steel reinforced concrete beams and mechanical performance analysis for its future application in the practical engineering and promotion has a realistic significance.In this paper,finite element analysis software ABAQUS is used to analyze the bearing capacity of embedded prestressed BFRP reinforced concrete beams.The size of the simulated beam is as follows:the length is 2400mm,the width is 150mm and the height is 300mm.The simulation experiment designed one without any reinforcement measures taken as contrast beam,reinforced concrete beam and 12 root respectively by the dosage of the reinforcing steel and the size of the initial prestress is a combination of variables reinforcement beam,a total of 13 simulation beam.Simulation results show that the reinforced concrete beam strengthened with embedded prestressed BFRP reinforced this way,has good effect to improve the bearing capacity of the beam,the yield load and ultimate load are increased with the increase of dosage of reinforcing steel and initial prestress and increase,influenced by both the common,but the increase rate is slowing,and as a result of prestressed reinforcement,the development of cracks in concrete beams and deformation also has better inhibition.According to the existing finishing and formula of beam structure reinforcement is derived according to the actual situation,concluded the embedded under different stress damage prestressed BFRP reinforced formula of the bearing capacity of the reinforced concrete beam and reinforced steel dosage calculation method,and the reliability of the formula of calculating according to the simulated data for practical reinforcement project to provide a more reliable calculation method and theoretical basis.