Analysis of Longitudinal Cracking for Hollow-core Slab Bridges

In order to study the typical disease of longitudinal cracks in the hollow-core slab beam of expressway, the stress state and spatial deformation of 13m hollow slab beam bridge are simulated numerically, and the influence of overload and hinge failure on the longitudinal cracks of beam is studied emphatically. The research shows: (1) after the prestressed steel strand is stretched, the longitudinal normal stressof hollow-core slab beam bottom is in the pressure state, when combined with the construction process and the vehicle load , the longitudinal stress of the beam bottom is still in the pressure state. (2) below the 0.96 times overload factor, the longitudinal direction of the beam bottom will not crack when the overload factor is between 0.96 and 1.5 times, the beam has a risk of cracking; more than 1.5 times the overload factor, the beam will produce longitudinal cracking.(3) the broken of hinge joint does not have a significant effect on the transverse normal stress of the hollow slab.