摘要
混凝土热学力学性能是混凝土龄期的函数,目前有指数式、双曲线式和双指数式3种表达式。指数式便于进行数学运算,但与试验资料吻合得不好。双曲线式和双指数式与试验资料吻合较好,但不便进行数学运算。本文提出既与试验资料吻合得较好又便于进行数学运算的组合指数式。采用该公式在推导混凝土温度应力的理论解时,便于进行数学运算,应用于数值计算时,可提高等效热传导方程的计算精度。
The adiabatic temperature rise,elastic modulus and strength of concrete are varied with age.There are three formulas for expressing the variations,including the exponential formula,the hyperbolic formula and the double exponential formula.The exponential formula is convenient to mathematical operation but it does not well accord with experimental results,whereas,the second and the third formulas are difficult to mathematical operation though they are well agree with experimental results.A new formula,the compound exponential formula,is proposed in this paper,which is convenient to mathematical operation and well accord with experimental results.The new formula has two merits：firstly,it is convenient to mathematical operation in the process of deriving theoretical solutions for temperature field and thermal stress of concrete structures;secondly,higher precision may be obtained when the thermal stress is computed by the equivalent heat conduction equation of mass concrete.
出处
《水利学报》
EI
CSCD
北大核心
2011年第1期1-7,共7页
Journal of Hydraulic Engineering
基金
国家科技支撑计划项目(2008BAB29B05)
水利部行业公益科研专项(200801007)
关键词
大体积混凝土
热学与力学性能
组合指数式
Mass concrete
compound exponential formula
adiabatic temperature rise
elastic modulus
strength
age of concrete
