大体积混凝土温度徐变应力简易算法  

A simple algorithm for calculating temperature creep stress of mass concrete

作　　者：叶金罡[1] 裴亮[1] 

机构地区：[1]四川大学水利水电学院,四川成都610065

出　　处：《人民长江》2010年第10期16-18,共3页Yangtze River

摘　　要：水泥水化热引起的温升导致大体积混凝土浇筑后会产生很高的温度应力,从而导致混凝土开裂。由于混凝土徐变产生的应力松弛降低了温度应力水平,这对防止混凝土开裂是有益的,因此,在温度应力的计算中必须考虑徐变的影响。目前在温度徐变应力的计算中采用有限元法居多,但有限元法计算效率较低。通过对原有松弛系数法计算公式进行补充并在误差允许范围内对其进行简化,提出了温度徐变应力的简易算法。对温度仿真分析结果采用简易算法进行温度徐变应力计算,通过计算结果的对比验证了计算的准确性,该方法为求解大体积混凝土温度徐变应力提供了一条便捷的途径。Temperature rise caused by hydration heat of cement after pouring will produce high temperature stress resulting in concrete cracking.However,the stress relaxation caused by concrete creep can reduce the temperature stress level,which is favorable to avoiding concrete cracking.Therefore,the concrete creep must be considered in the calculation of temperature stress.Through modification of relaxation coefficient calculation formula and simplification of the formula in an allowable error range,we proposed a simplified algorithm of temperature creep stress.For temperature simulation result,the simplified algorithm is used to calculate the temperature creep stress and the result comparison verify the correctness of the algorithm,which provides a high efficiency method for calculation of temperature creep stress in mass concrete.

关 键 词：温度应力 应力松弛 松弛系数 徐变 简易算法 

分 类 号：TV43[水利工程—水工结构工程]