Checking and Analysis of Reinforcement Arrangement Scheme for Slab Track Based on Comprehensive Index Method

To optimize the mechanical performance of the slab track after reinforcement, an evaluation method for track reinforcement was proposed based on comprehensive index method. The shape change energy density and Gaussian curvature were selected as the evaluation components to construct the quantitative checking index of the reinforcement. Taking CTRS Ⅲ ordinary type slab track as an example, a finite element model for slab reinforcement checking was established, and the influence of different reinforcement schemes on the overall mechanical performance of slab was analyzed. The results indicate that the proposed comprehensive index could highlight the uneven stress area of the track slab. The centralized reinforcement under the rail position can improve the resistance of the track slab to the vertical vehicle load. However, the excessively concentrated reinforcement will lead to a worse adaptability to the temperature load. Compared to the optimum scheme, the comprehensive index of the end of the track plate of the excessively concentrated reinforcement scheme under the heating load is more than doubled. The scheme with larger steel bar diameter and sparse arrangement has poor force balance. The track slab should choose a reinforcement scheme with smaller steel bar diameter, densely arranged, and appropriate centralized under the rail.