CRTSⅡ型板式无砟轨道桥梁台后倒T型和双柱型锚固体系的对比研究

Comparative study of double-column shaped anchoring system and inverted T-shaped anchoring system for bridge abutment in CRTSⅡ Ballastless Track

以CRTSⅡ型板式无砟轨道桥梁台后锚固体系(工程实践被称为端刺)为研究对象,以双柱型端刺和倒T型端刺为例,对台后锚固体系进行了研究。利用ANSYS有限元软件建立了锚固体系的纵横垂向空间耦合静力学分析模型,对其进行受力变形分析。模型中综合考虑桥梁与底座板、轨道板与底座板、底座板与台后锚固体系的相互作用关系,荷载形式以温度力、制动力为主。研究在相同受力下,过渡段换填前后的影响,以及在相同制动力和温度荷载条件下,双柱型端刺和倒T型端刺的受力性能,结果表明下部结构的刚度对上部结构的位移、应力有较大的影响,且随温度变化,从主端刺到小端刺,纵向位移逐渐减小,倒T型端刺抵抗纵向变形能力优于双柱型端刺。

In the thesis, the study takes the anchoring bolting system which is called terminal displacement configuration system （TDCS） in the engineering practice and contains double-column shaped TDCS and inverted T-shaped TDCS for bridge a- butment aiming at stabilizing ballastless track on bridge as the main study object. With the finite element software ANSYS, the longitudinal-vertical-lateral spatial coupling static analysis model is established to study the deformation and force law of the struc- ture. In the model, the interaction between the track slabs and the bed plates, the in- teraction between the bed plates and the bridge, and the interaction between the bed plates and the anchoring bolting system are all considered. The influence factors, such as the braking force, the temperature force are studied for the both forms of the ancho- ring bolting system. The results show that the substructure stiffness has a great influ- ence on the displacement and stress of the superstructure. Longitudinal displacement decreases gradually from the main TDCS to the small TDCS with the temperature change, and the T-Shaped TDCS is better than the double-column shaped TDCS in this aspect.