关键词: 桥梁工程, 大体积混凝土, 管冷, 水化热, 温度场

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