Research On Optimization Of The Section Height Of The Rail Of Embedded Rail Structure

As a representative of a new tram track structure, the embedded rail structure for modern tramway lines has been widely used in urban rail transit because it achieves good effect on vibration reduction and noise reduction. Compared with slab track structure, the embedded rail structure can be regarded as the continuous elastic support track structure. However, compared with the slab track structure which can be regarded as the single point elastic support track structure, the embedded rail structure has lower demand for rails’ flexural rigidity. Combining with the practical situation of demonstration route, this paper builds a mechanical model that rials are under different ways of support. In meet the under the theory of preliminary design under the condition of strength and stability of the rail, rail, the rail section highly optimized research. The main research contents include(1). By collecting information, this paper introduces analysis theory under the ways of Elastic point support and continuous elastic support. Also, this paper makes a preliminary qualitative analysis of the ultimate strain height to get the recommended height value-87mm. According to the main material parameters, the paper builds a analysis model of the stability of embedded rail structure. Based on this, the beam element model for the strength of rail and the three-dimensional solid finite element model for the stability of rail is 101mm.(2).The section stress position and dangerous section of a rail was analyzed. In detail, this paper analyzes the stress and displacement of the rail under different support conditions of elastic point support beam model and continuous elastic support beam model. And the calculation result is also compared and analyzed. On the premise of satisfying the strength requirement of the embedded rail structure, optimize the ultimate strain height to obtain the proposed height of rail that can satisfy the requirement of rail web strength checking 50mm.(3).Analysis to meet the dynamic bending force under the stability of the rail, rail waist height not at the same time, with the increase of temperature, rail vertical displacement variation trend is basically the same, rail waist reduction in height of rail vertical stability is favorable. It is feasible to optimize the rail waist height in the vertical stability of the rail. Supporting stiffness and with the increase of temperature, rail vertical displacement variation trend is basically the same, temperature rise from 20 DEG C to 50 C rail vertical displacement increased linearly, grow faster, but the displacement of the value is not large, more than 50 DEG C displacement changes little, rail vertical displacement decreases with increasing of bearing stiffness, changes in the larger, but orders of magnitude is still very small. Embedded materials have enough constraint on the rail.