Study on Temperature Field of Massive Concrete with Pipe Cooling in Initial Stage of Hydration Heat

doi:10.3969/j.issn.1674-0696.2018.06.01

Abstract

Abstract: According to the equivalent heat conduction equation of pipe cooling in mass concrete，a three-dimensional finite element real model of the bearing platform was built by the finite element analysis software Midas/Civil，based on the construction of the #22 pilecap of Wuhan Fuhe Bridge.The simulation of the temperature field in #22 pilecap was conducted，and the temperature of the concrete was monitored.After comparing the finite element calculation results and the measured data，it was showed that the two results were in good agreement.This shows that the established finite element model is capable of simulating the variation characteristics of the temperature filed in mass concrete in the initial stage of hydration heat.The finite element calculation results reveal that the distribution of tensile stress on the surface of the pilecap was improved after strengthening the insulation of the pilecap surfaces.The risk of cracking was effectively reduced.By analyzing the impacts of inlet temperature of pipe cooling according to thefinite element model ，it can be proven that although the drop in inlet temperature can effectively reduce the maximum temperature of interior of concrete and can enable the pilecap to reach its maximum temperature in a short time before beginning the cooling down process. There are also some negative effects.It is desirable to make corresponding adjustments of the inlet temperature of cooling pipe by the maximum temperature in interior of the pilecap.In actual engineering，it is best to make corresponding adjustments to the inlet temperature of pipe cooling according to the maximum temperature in the interior of the pilecap.

Key words: bridge engineering, massive concrete, pipe cooling, hydration heat, temperature field

摘要： 结合武汉府河大桥22#承台施工，根据水管冷却等效热传导方程，利用有限元软件Midas/Civil建立了承台三维实体有限元模型，对承台浇筑后的温度场进行模拟，并对混凝土温度进行实际监测，对比分析有限元计算结果和温度监测结果，二者吻合良好，所建立的有限元模型可以较好的模拟大体积混凝土早期水化热温度场变化特征；对承台表面加强保温后，根据有限元计算结果，表面拉应力分布得到改善，可有效降低承台开裂风险；利用有限元模型分析冷管入水温度的影响，证明降低冷管入水温度虽然可有效降低混凝土内部最高温度，并可在较短时间内使承台达到最高温度进而开始降温，但也存在不利影响，实际工程中冷管入水温度最好可以根据承台内部最高温度做出相应调节。

关键词: 桥梁工程, 大体积混凝土, 管冷, 水化热, 温度场

CLC Number:

U443.25

LI Zhida，SUN Xutao. Study on Temperature Field of Massive Concrete with Pipe Cooling in Initial Stage of Hydration Heat[J]. Journal of Chongqing Jiaotong University(Natural Science), 2018, 37(06): 1-7.

李之达，孙绪涛. 考虑管冷的大体积混凝土水化热初期温度场研究[J]. 重庆交通大学学报（自然科学版）, 2018, 37(06): 1-7.

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