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为了研究环境降温作用对混凝土主塔早期开裂的影响,通过求解热传导方程推导出降温作用下主塔塔壁的温度分布公式,进而通过分析混凝土早期弹性模量、徐变影响,导出计入时变效应的塔壁表面温度应力计算公式。得到反映环境降温作用的温度～时间、应力～时间关系曲线。结果表明:环境降温作用将导致塔壁表面产生拉应力,应力值大小与塔壁内外表面放热系数、塔壁厚度、混凝土水化热、环境降温值、降温起始及持续时间等因素密切相关;上述因素偏不利时,会引发混凝土主塔开裂。
In order to study the effect of environmental cooling on the early cracking of concrete pylons, the temperature distribution of the tower wall under the cooling effect is deduced by solving the heat conduction equation. Based on the analysis of the early elastic modulus and creep of concrete, Effect of tower wall surface temperature stress calculation formula. Get the temperature effect of the environment temperature ~ time, stress ~ time curve. The results show that the cooling effect of the environment will lead to tensile stress on the surface of the tower wall. The magnitude of the stress is closely related to the exothermic coefficient of the inner and outer wall of the tower wall, the thickness of the tower wall, the hydration heat of the concrete, the temperature drop, the start and the duration of the cooling down ; When the above factors are unfavorable, it will lead to cracking of the concrete main tower.