船闸大体积混凝土水化热温度监控及有限元仿真分析

为研究大体积混凝土水化热的温度变化规律及其对温度裂缝产生的影响,对在建船闸进行有限元仿真分析并对埋设温度计进行监控.通过对比分析有限元计算结果和实测温度结果,得到两者存在差异的可能原因.通过对放热函数及强度调整函数的参数设置调整,使计算结果更接近工程实际情况.在有限元分析结果的基础上,通过裂缝指数来评价船闸主体结构温度裂缝产生的可能性,在对放热函数及强度调整函数进行调整后,计算结果表明结构出现温度裂缝的可能性在5%以下,与主体结构外观情况相符.对比分析不同规范对温度应力计算规定的异同,以期为相关计算选择适用规范及互通有无提供参考依据.

Temperature monitoring and finite element simulation analysis of mass concrete hydration in ship lock

In order to study the temperature variation law of hydration heat of mass concrete and its influence on temperature cracks,we carry out a finite element simulation analysis and monitoring of buried thermometers for the ship lock under construction. By comparing the results of finite element calculation and measured temperature,we get the possible reasons for the difference between them. By setting the parameters of heat release function and strength adjustment function,the calculated results are closer to the actual engineering situation.Based on the results of finite element analysis,the possibility of temperature cracks in the main structure of ship lock is evaluated by the crack index. After adjusting the heat release function and strength adjustment function,it is known by calculation that the possibility of cracks in the main structure is less than 5%,which is consistent with the appearance of the main structure.We also discuss the similarities and differences of various codes for calculating the temperature stress to provide reference for selecting applicable codes and interoperability for relevant calculation.