Ductility Study Of Prestresssed Steel Reinforced Ultra-High-Strength Concrete Beams

In recent year, people pay more attention to ultra-high-strength concrete. But its application in civil engineering is limited by its brittlement. Prestressed steel reinforced ultra-high-strength concrete beam comes out after assembling structural steel and prestressed tendon. That composite beam is not just simply adding section, prestressed tendon and reinforced concrete beams. It takes full advantages of ultra-high-strength concrete’s high compressive strength, density and stiffness etc. Structural steel can significantly increase beams’capacity and stiffness. Prestressed tendon can put off concrete cracking and decreases beams’ deflection of middle span. Prestressed steel reinforced ultra-high-strength concrete beams have the advantages of reinforced concrete beams and steel beams.At present, there are little reports about prestressed steel reinforced ultra-high-strength concrete beams. Experimental study cost long period and much money, so this article uses the finite element software ABAQUS to calculate prestressed steel reinforced high strength concrete beams’ flexural strength and ductility performance under monotonic static loading effect. The main findings are as follows:(1) This article introduces the finite element theory and procedure of building finite element model of ABAQUS. Based on test, four prestressed steel reinforced ultra-high-strength concrete beams were simulated. Contrast the destruction process, the load-displacement curve, the bearing capacity and stiffness to the test results to verify the correctness of the finite element model.(2) Sixteen prestressed steel reinforced ultra-high-strength concrete beams were simulated. This article analyses the beams’mechanical characteristics under monotonic static loads. Studied the longitudinal reinforcement ratio, structural steel position, structural steel ratio, prestressed tension ratio, prestressed tendons’ position and effective pre-stress of specimens BEAMS, failure modes, load and ductility properties affect.(3) Joining section in prestressed ultra-high-strength concrete structure can sharply increase the carrying capacity and stiffness. At the same time, span deflection has been effectively controlled, which makes the beams fully apply in rise and large span structures.