Experimental Study On The Deismic Capacity Of Reinforced Concrete Flexural Members

The technologies for strengthening structures which have been widely utilized in construction are considered as a rapid, economic, suitable and durable method. Compared with the other strengthening technologies, the method with CFRP and grout material has some better abilities such as easy construction, light weight, high strength. Therefore, the method with CFRP and grout material for strengthening reinforced concrete structures has been investgated in recent years and it has been proved that this method is worthy to be spread and has economic and social value.In this paper four reinforced concrete flexural members have been reseached, and three damaged components of them have been strengthened using the method with CFRP and grout material and anchorage with angle steel at the ends of members. Through comparison and analysis, the coefficients of seismic capacity and bearing capacity in the situation of same size and same concrete reinforcement but different strengthening methods have been obtained. The results shows that: in the situation of sticking one layer of carbon fiber, the members with CFPR enclosed stirrups at the ends have better seismic capacity and bearing capacity than the ones without enclosed stirrups at the ends; the members sticking two layers of carbon fiber have better seismic capacity and bearing capacity than the ones sticking one layer of carbon fiber; the crack shapes on the flanks of member ends have been significantly improved with CFPR enclosed stirrups at the ends and the development of cracks have been inhibited to some degree; from the failure locations of carbon fiber layer it can be judged that steel plates have a positive effect for carbon fiber layer.By comparing with the experimental results and the calculation results of bearing capacity using computing formulas, the calculation results of bearing capacity have small difference with the experimental results and they would be safer, so they would be refered to strengthening engineering design. Because the seriously damaged reinforced concrete flexural members have better bearing capacity and deformability after repairing and strengthening, the methods in this paper have feasibility and practicability.