Nonlinear Performance of Prestressed Concrete Beam with ShellBeam Composite Element

Abstract:

With the nonlinear shellbeam composite(SBC) element, the nonlinear analysis model of prestressed concrete T beam was established and the whole failure process was studied. The stiffness reduction and stress redistribution of T beam were analyzed. Based on the layered shell element and the beam element calculation model, the prestressed reinforcement was simulated by the SBC element, and the ordinary steel and concrete were simulated by the layered shell element. The material nonlinearity of prestressed concrete T beams was considered reasonably through Owen criterion and others. The spatial prestressing effect of the prestressed steel bar was simulated effectively and the corresponding nonlinear calculation program was developed. The calculation results of this method are in good agreement with the experimental results of the test beam, which shows that the nonlinear SBC element method is proper for the analysis of the structure. It provides an effective method for evaluating and studying this kind of thinwalled structures.

Key words:bridge engineering; prestressed concrete T beam; shellbeam composite element; stiffness reduction; stress redistribution