| 朱伯芳.混凝土热学力学性能随龄期变化的组合指数公式[J].水利学报,2011,42(1): |
| 混凝土热学力学性能随龄期变化的组合指数公式 |
| China Institute of Water Resources and Hydropower Research， Beijing 100038，China |
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| DOI： |
| 中文关键词: 大体积混凝土 热学与力学性能 组合指数式 |
| 英文关键词: Mass concrete compound exponential formula adiabatic temperature rise elastic modulus strength age of concrete |
| 基金项目: |
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| 中文摘要: |
| 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。 |
| 英文摘要: |
| 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. |
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