Analysis of Integral Loading Properties of Assembled Prestressed Concrete Hollow Slab Bridge Affected by Hinge Concrete

摘要

To study the effects of hinge concrete on the integral loading properties of assembled prestressed concrete hollow slab bridge, the numerical model of whole bridge is build up by 3D finite element method. The hollow slab concrete, the hinge concrete, the pavement concrete and asphalt concrete are divided by solid elements, the prestressed reinforcements are divided by link-elements, and the ordinary steel bars are dispersed into corresponding concrete by equivalent modulus. The vehicle loads are arranged resulting in the unfavorable bearing status of hinge concrete. The construction sequence is also modeled by the calculation. The hinge concrete strengths are taken as reaching 100%, 80% and 60% of the design value. The analyses show that there is less influence of the hinge concrete strength on the integral loading properties of bridge, the reduction of hinge concrete strength will decrease its tensile capacity and lead to the cracks along hinge. If the cracks became serious under cyclic vehicle loads, the pavement above the hinge would also crack and the concerted actions of the assembled hollow slabs would be damaged and resulted in loading by single slab.