铁路钢波纹管涵洞力学特性与计算方法研究

发布时间：2018-08-31 11:24

【摘要】：铁路行车速度的提高,对线下构筑物的变形和承载性能提出了更高的要求。波纹钢管涵洞作为一种有别于传统刚性涵洞的柔性结构体系,具有较好的技术经济性。钢波纹管涵洞在高填方填土荷载和低填方列车动荷载作用下的受力变形特性尚不明确,本论文通过数值模拟的方式,对波纹钢管涵洞在填土荷载和车辆动荷载作用下的受力变形特性进行了研究,并对填高、波形、壁厚、管径、填土模量、轴重和车速等关键设计参数对波纹管受力变形性能的影响进行了分析,主要成果有：(1)阐明了钢波纹管环向、轴向和冯-米塞斯应力的分布规律；环向土压力沿管周的分布规律。(2)填土荷载为覆土波纹钢管所承受的主要外部荷载,填高对其应力和变形都有重要影响。(3)波形、壁厚和管径都为几何参数,影响着波纹管的截面刚度,但不同参数对受力变形的影响不尽相同。(4)填土模量越大,波纹钢管的应力和变形都越小。(5)采用拟静力的计算方式考虑动荷载的影响时,应注意到钢波纹管应力和变形的增量并不一致。(6)随着轴重和车速的提高,系统各项动力响应均呈非线性增大；在轴重15.5-22T,速度120-250km/h这一常见轴重和车速范围内,相较轴重而言,速度对波纹钢管变形的影响较小。
[Abstract]:With the increase of railway speed, higher requirements for deformation and bearing capacity of structures under line are put forward. Corrugated steel pipe culvert is a flexible structure system, which is different from traditional rigid culvert. The deformation behavior of steel bellows culvert under high fill load and low filling train dynamic load is not clear. The deformation characteristics of corrugated steel pipe culverts under fill load and vehicle dynamic load are studied, and the filling height, waveform, wall thickness, pipe diameter and filling modulus are also studied. The influence of the key design parameters such as axle load and speed on the stress and deformation performance of bellows is analyzed. The main results are as follows: (1) the distribution law of the steel bellows' toroidal, axial and Von Mises stress is expounded; The distribution of circumferential earth pressure along the circumference of pipe. (2) fill load is the main external load of corrugated steel pipe with overburden soil, and filling height has important influence on stress and deformation. (3) Waveform, wall thickness and diameter are geometric parameters. The cross-section stiffness of corrugated pipe is influenced by different parameters. (4) the larger the modulus of fill, the smaller the stress and deformation of corrugated steel pipe. (5) when the dynamic load is considered by pseudo-static calculation, It should be noted that the increment of stress and deformation of steel bellows is not consistent. (6) with the increase of axle load and speed, the dynamic response of the system increases non-linear, and in the range of axle load 15.5-22T, velocity 120-250km/h, compared with axle load, The velocity has little effect on the deformation of corrugated steel pipe.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U449.83

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