An T Type Reinforcement Scheme of Portal Steel to Restrain the Gap between CRTSIII Slab and Self-compacting Concrete

Abstract

The gap between slab and self-compacting concrete is one of the typical disease for CRTSIII slab ballastless track structure under service condition. This paper established finite element mechanical analysis model of track structure including rail, fastener, track slab, portal steel, self-compacting concrete, isolation layer and base according to the CRTSIII track slab structure characteristics, an t type reinforcement scheme of portal steel was proposed, and analyses the vertical stress characteristics of the interface between slab and self-compacting concrete under train and temperature gradient load before and after reinforce portal steel. The results show that when the interface appears gap and is non-gap, the vertical maximum tensile stress of interface is respectively reduced 80% and 87% after reinforce portal steel. It can also reduce the probability of the occurrence of gap between the slab and self compacting concrete, slow down the expansion rate of the isolated region, and improve the durability of rail structure in the course of service. Keywords-CRTSIII Type Slab Ballastless Track Structures; Temperature Gradient; Gap between Slab and SelfCompacting Concrete; Reinforce Pportal Steel; Interfacial Stress;