高速铁路桥梁结构温度场特性研究

发布时间：2018-04-04 23:03

本文选题：高速铁路　切入点：混凝土箱梁　出处：《中南大学》2014年硕士论文

【摘要】：摘要：桥梁在与外界环境的热交换过程中,受到太阳直接照射、对流换热、辐射换热的作用,梁体内产生非线性的温度场,影响桥梁结构的安全性。随着我国高速铁路的发展,温度效应问题突出表现在：1.轨道结构与桥梁结构互相影响,系统内温度场问题复杂,但我国相关规范未考虑无砟轨道对桥面的遮挡作用；2.随着大跨度钢桥的发展,温度效应已经成为关乎大跨度钢桥列车走行性的重要课题,而目前对钢桥温度荷载的规定尚不完善。因此有必要对铺设无砟轨道混凝土桥梁及铁路大跨度钢桥的温度效应及温度模式加以研究。本文以某32m预应力简支箱梁桥和沪通长江公铁两用大桥为工程背景,主要研究工作如下： (1)基于ANSYS大型通用有限元软件,以热流密度作为模拟未铺设CRTS Ⅱ型板式无砟轨道简支梁的热边界条件,分析其温度场的时变规律,并与实测数据进行对比,验证了计算结果的准确性。 (2)建立了铺设CRTS Ⅱ型板式无砟轨道的混凝土简支梁热力学模型,进行了考虑无砟轨道遮挡后箱梁桥的温度场效应研究,探讨了设CRTS Ⅱ型板式无砟轨道箱梁的日照温度分布规律。 (3)对CRTS Ⅱ型板式无砟轨道箱梁典型时刻的温度自应力分布规律进行了分析,提出了横、竖向温度梯度模式。与各国规范关于竖向温度梯度分布的进行了对比,证明本文所得温度梯度曲线较为合理。 (4)以沪通长江公铁两用大桥为工程背景,建立大跨度钢桁桥双层桥面热力学模型,考虑了公路桥面对铁路桥面的遮挡效应,进行了温度场效应研究,初步探讨了大跨度钢桁架桥的日照温度分布规律。
[Abstract]:Abstract: the bridge in exchange with the external environment in the process of heat, by direct solar radiation, heat convection, heat radiation effect, temperature field of nonlinear beam, affect the safety of bridge structure. With the development of high-speed railway in China, the temperature effect of outstanding performance in: 1. track and bridge the structure of mutual influence, problems in temperature field is complex, but the relevant norms of our country did not consider the ballastless track on bridge deck shelter effect; 2. with the development of large span steel bridge, the temperature effect has been related to large span steel bridge train for the important subject, and the current provisions of the steel bridge temperature load is not perfect. Therefore it is necessary to study the temperature effect of laying ballastless track concrete bridges and railway long span steel bridge and temperature model.
In this paper, the main research work is as follows: a 32m prestressed simple supported box girder bridge and the Shanghai Tong Changjiang River dual-purpose bridge as the engineering background.
(1) based on the ANSYS general finite element software, taking the heat flux as the thermal boundary condition for simulating the simply supported beam of CRTS II slab ballastless track, the time-varying law of the temperature field is analyzed, and the accuracy of the calculation results is verified by comparing with the measured data.
(2) a thermodynamic model of concrete simply supported beam laying CRTS II slab ballastless track is established. The temperature field effect of box girder bridge after ballastless track occlusion is studied. The rule of sunshine temperature distribution for CRTS II slab ballastless track box girder is discussed.
(3) the thermal stress distribution law of typical moment ballastless track box beam of CRTS type plate are analyzed, put forward the horizontal and vertical temperature gradient mode. With all the specifications on the vertical temperature gradient distribution were compared, show that this temperature gradient curve is more reasonable.
(4) in Shanghai Yangtze River Tianxinzhou bridge as the engineering background, the establishment of a thermodynamic model of double deck large span steel truss bridge, the highway bridge face the shielding effect of railway bridge, the effect of temperature field, discussed the temperature of long-span steel truss bridge of the distribution.

【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.5

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