Research On The Shear Behavior Of Hybrid Reinforced Concrete Beams

RC structures have been widely used in the field of civil engineering, and its durability gains more and more attention .To improve the durability of RC structures, replacing steel bars with fiber reinforced polymer bars (FRP bars) in RC structures is proposed by researchers. But the low elastic modulus and linear elastic stress-strain relationship of FRP bar lead to the characteristic of brittle failure and too large crack width and deflection of FRP bar reinforced concrete components. The application of FRP bar in civil engineering is restricted.The hybrid reinforced concrete members proposed by the superviser of the author have the advantage of good durability, and overcoming the disadvantage of poor serviceability of FRP structures. The rusty of steel stirrups occurs firstly in the angle region of the cross section, which leads to poor serviceability of the concrete members. Hybrid stirrups are disposaled to overcome this disadvantage.The main purpose of this thesis is to study the shear performance of hybrid reinforced concrete beams. An experimental program is carried out to test six concrete beams hybrid reinforced and one control beam reinforced only by steel bars. The mechanics and service performance of hybrid reinforced concrete beams under shear force and bending moment is analyzed and the comparement of shear capacities between hybrid reinforced concrete beams and RC beams is carried out in the thesis. The formula for shear capacity and crack width of hybrid reinforced concrete beams are proposed based on the analysis of the experiment, which have a good connection with RC structure code. It is hoped that this explorative research coud prompt the wide application of hybrid reinforced concrete structures.