西溪河特大桥钢管混凝土拱肋水化热温度场分析

Analysis of hydration heat temperature field of concrete-filled steel tubular arch rib of Xixi river super-large bridge

运用有限元软件ANSYS对钢管混凝土拱肋水化热过程进行模拟分析,得出混凝土水化热过程的温度变化规律,在此基础上通过改变钢管的壁厚以及直径,分析了影响钢管混凝土水化热的参数。研究结果表明:钢管壁厚对水化热过程温度影响较小,可以忽略不计;钢管直径对其温度影响显著,随着直径的增大,钢管外表面和核心混凝土温度都出现了不同程度的上升,对核心混凝土的温度影响更为显著;随着钢管直径的增加,核心混凝土的温度峰值时刻相对滞后,直径每增加200 mm,温度峰值时刻滞后约2.5 h。

The hydration heat process of concrete-filled steel tubular arch rib was analyzed by using ANSYS software. The temperature change history was studied. A parametrical analysis was performed,analyzing the effect of tube thickness and diameter. The results show that the effect of tube thickness is little while the effect of tube diameter is significant. As the diameter increases,the temperature at the outer tube surface and the core concrete increases; in particular,the temperature effect on the latter is more significant. Also,with the increase of the diameter,the concrete temperature peak time delays. Every 200 mm increase of diameter leads to about 2. 5 h tem perature peak lag.