Research On The Flexural Load-bearing Capacity Of Reinforced Concrete Beam Strengthened With AFRP

A new technology that strengthen the concrete by using aramid fibe r reinforced plastic (AFRP) was proposed in developed countries in 199 Os. Resinae structural adhesive is used to stick the aramid fiber plastic on the surface of concrete structure and achieve the aim of strengthe n. Compared with carbon fiber and glass fiber, aramid fiber has higher co rrosion and fatigue resistance, greater nonmagnetic nature, insulativity an d lower cost. Therefore, it was widely used to strengthen the reinforced c oncrete members in recent years.(1) This study strengthened five reinforced concrete beams with AF RP to improve the flexural capacity. The influences of AFRP strength en on mechanic properties, such as bearing capacity, failure mode, sti ffness, ductility, cracking and ultimate load, of reinforcement concrete beam under the condition of as primary and secondary loading were st udied. Meanwhile, the destruction process of flexural concrete member with AFRP and influences of the AFRP content and hopping mode o n flexural property of the reinforced concrete beam was also discussed. The results showed that AFRP is effective to improve the flexural bearin g capacity of reinforcement concrete member. The bending capacity of be ams and the ductility of flexural members have been enhanced dramaticall y after sticking the aramid fiber.(2) Based on the assumption that the section is plane, this paper proposed a formula to calculate the flexural bearing capacity after AFR P strengthening. The calculating results of this model is consistence w ith experimental results, which provides theoretical basis on the applic ation of AFRP in civil engineering.(3) By means of ANSYS finite element analysis, L-1、L-2、L-4 wa s numerically simulated, whose results agrees well with the experimenta 1 data and can be used in engineering practice.