Analysis of ultimate load-capacity for reinforced gradient concrete beams consisting of normal and high strength concrete

The reinforced gradient concrete beam consists of normal concrete tensile region and high concrete compressive zone. This new flexural member may easily satisfy the requirement of the depth of the limiting compressive zone in reinforced concrete flexural element. The experiment of simple beam with reinforced gradient concrete was carried out. Ultimate compressive strain, maximum deflection and strains of round stirrup are measured. Assumption on plane before loading remaining plane under ultimate load and harmony of two concretes were analyzed emphatically. The calculation method of ultimate load-bearing capacity of such flexural member is proposed. Plastic hinge rotation capacity and curvature ductility are analyzed. It can be served as calculation for ultimate limit state of reinforcing gradient concrete flexural members.