高墩三维日照温度场数值模拟及试验研究

发布时间：2018-07-31 12:14

【摘要】：研究目的:山区高速铁路圆端形空心高墩在日照作用下会存在温差,当截面温差及桥墩高度较大时,就会引起桥墩温度应力及墩顶位移,从而影响高速铁路运行的安全性及舒适性。为获取高墩三维日照温度场及温度变形规律,本文建立高墩三维温度场有限元模型,对高墩日照温度变化开展现场试验及模型验证,以68 m圆端形空心高墩为例,分析高墩径向、竖向温度场,以及高墩在日照作用下的变形和受力特征。研究结论:(1)高墩在日照作用下,径向温度沿壁厚方向变化符合负指数函数T_x=Ae~(-ax)+B变化规律,日照温度影响深度约为0.60 m;(2)桥墩表面竖向温度符合T_z=Ae~(-ax)+kz+B函数变化规律;(3)墩顶最大水平位移发生在18:00左右,因此可取18:00的温度场作为控制荷载,对桥墩结构的变形进行检算;(4)桥墩内、外壁均会受到拉应力的影响,在设计时应同时考虑内、外表面的配筋加强,以保证桥墩的抗裂和安全性;(5)该研究成果可为高速铁路圆端形空心高墩的设计和施工提供参考。
[Abstract]:The purpose of this paper is to study the temperature difference of round end hollow high pier in mountain area high-speed railway. When the temperature difference of section and height of pier is large, the temperature stress of pier and the displacement of pier top will be caused. Therefore, the safety and comfort of high-speed railway are affected. In order to obtain three-dimensional sunshine temperature field and temperature deformation law of high pier, the finite element model of three-dimensional temperature field of high pier is established in this paper. The field test and model verification of sunshine temperature change of high pier are carried out. Taking 68 m round end hollow high pier as an example, The radial and vertical temperature fields of high piers and the deformation and stress characteristics of high piers under sunlight are analyzed. The conclusions are as follows: (1) the variation of radial temperature along the wall thickness of the high pier under sunlight is in accordance with the law of negative exponential function TX _ x Ae ~ (-ax) B, The influence depth of sunshine temperature is about 0.60m; (2) the vertical temperature of pier surface conforms to the variation law of Tzzhe Ae- ax) kz B function; (3) the maximum horizontal displacement of pier top occurs at about 18:00, so the temperature field of 18:00 can be used as the control load. The deformation of the pier structure is checked and calculated. (4) in the pier, the external wall is affected by the tensile stress, and the reinforcement of the inner and outer surfaces should be considered in the design. In order to ensure the anti-cracking and safety of bridge piers, (5) the research results can be used as a reference for the design and construction of round end hollow high piers in high-speed railway.
【作者单位】：中南大学;湖南省交通规划勘察设计院;
【基金】：国家自然科学基金资助项目(51378503) 中国铁路总公司科技研究开发计划资助项目(2015G001-K)
【分类号】：U441.5

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