钢管混凝土拱肋水化热效应参数分析

Analysis on parameters of hydration heat effect of concrete-filled steel tube arch ribs

为研究钢管混凝土拱肋水化热效应,本文以猛洞河大桥为例,基于基本热力学假定条件,通过采用有限元软件Midas FEA建立拱肋局部模型,研究环境温度、钢管直径及钢管壁厚3个参数对钢管混凝土拱肋浇筑过程中核心温度的影响规律。结果表明:随着环境温度升高或钢管直径增大,混凝土核心温度有所上升,且上升速度随温度增加逐渐增大;钢管壁厚对混凝土核心温度并无显著影响。该研究结果可为类似工程提供借鉴与参考。

In order to study the hydration heat effect of concrete-filled steel tube arch ribs,the Mengdong River Bridge is taken as an example.Based on basic thermodynamic assumptions,a local model of the arch ribs is established by using the finite element software Midas FEA to study the influence of such 3 parameters as environmental temperature,steel tube diameter and steel tube wall thickness on the core temperature during the pouring process of concrete-filled steel tube arch ribs.The results show that,as the ambient temperature raises or the diameter of the steel pipe increases,the core temperature of the concrete increases,and the rising speed gradually increases with the increase of temperature;the steel pipe wall thickness has no significant effect on the concrete core temperature.The results can provide references for similar projects.