大跨度混凝土连续箱梁桥日照温度场试验及仿真分析

发布时间：2018-07-10 01:55

本文选题：混凝土箱梁 + 太阳辐射　；参考：《铁道标准设计》2017年09期

【摘要】：为研究大跨连续箱梁桥的日照温度场分布特点与最不利温度梯度模式,以唐山曹妃甸工业区纳潮河2#大桥施工阶段实桥监测为基础,基于太阳物理学、传热学等相关理论,建立箱梁温度场的热边界条件。参考相关文献确定有限元瞬态热分析的环境参数与热工参数,运用ANSYS软件模拟日照下箱梁的瞬态温度场分布并与实测值进行对比分析,采用最小二乘法拟合出箱梁竖向最不利正温度梯度。研究表明:箱梁截面二维温度场近似关于桥轴线对称分布;顶板、底板、东腹板、西腹板内外表面日照最大正温差出现时刻分别为14:00、15:00、11:00、17:00;混凝土导热性能差,内表面峰值温度出现时刻滞后外表面2~3 h;唐山市曹妃甸区箱梁截面的竖向温度梯度为Ty=19.2e-4y;环境与热工参数选取合理,采用有限元软件ANSYS进行数值模拟具有较高精度。
[Abstract]:In order to study the distribution characteristics of sunshine temperature field and the most unfavorable temperature gradient model of long-span continuous box girder bridge, based on the actual bridge monitoring in the construction stage of Naochao2# Bridge in Caofeidian Industrial Zone in Tangshan, based on the relevant theories of solar physics, heat transfer, etc. The thermal boundary conditions of the box girder temperature field are established. The environmental parameters and thermal parameters of finite element transient thermal analysis are determined by referring to relevant literature. The transient temperature field distribution of box girder under sunlight is simulated by ANSYS software and compared with the measured value. The vertical most unfavorable positive temperature gradient of box girder is fitted by least square method. The results show that the two-dimensional temperature field of the box girder section is approximately symmetrical distribution of the axis of the bridge, and the maximum positive temperature difference between the inside and outside surface of the roof, bottom plate, eastern web and west web is 14: 00, 15: 00, 11: 00, 17: 00, respectively, and the thermal conductivity of concrete is poor. The peak temperature of the inner surface lags behind the outer surface for 2h, the vertical temperature gradient of the section of the box girder in Caofeidian District of Tangshan City is Type 19.2e-4y. the selection of the environment and thermal parameters is reasonable, and the numerical simulation using the finite element software ANSYS has a high accuracy.
【作者单位】：西南交通大学土木工程学院;
【基金】：中建股份科技研发课题(CSCEC-2015-Z-5) 中央高校基本科研业务费专项基金(SWJTU12CX073)
【分类号】：U441.5;U448.213

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