Parameters sensitivity analysis of prefabricated prestressed concrete pavement slab

Abstract

The prefabricated prestressed concrete pavement with assembly construction and prestressing technology has the advantages of rapid construction and reliable quality. In this paper, a three-dimensional finite element model of the pavement structure was established by numerical simulation method. The parameters including the slab dimension, the thickness of the slab, the prestress value and position of the prestress tendon were sensitively analyzed. The results showed that the slab dimension has a critical value of 1m×1m.While the slab is larger than the critical value, the stress of the slab is almost unchanged. The thickness of the slab also has a critical value of 0.12m. When the slab is less than the critical value, the forced mode of the slab will be changed. With the increase of prestress, the stress concentration at the end of the slab will occur, but the maximum stress did not exceeded the strength of the material. It is suggested that the prestress value should be 4-5MPa. The lower the position of the prestress tendon in the slab is, the more obvious the anti-arch effect is, and it is safe to set the prestress tendon in the middle of the slab.