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鉴于单一因素、标准条件下的混凝土变形模型不能真实评价实际混凝土结构处于多场耦合作用下的服役性能,讨论了混凝土水化-温度-湿度多场耦合作用的物理机制,建立了相应的材料变形计算模型。沪通长江大桥超高索塔塔根底部结构混凝土的计算实例表明:大体积混凝土早期水化热应力产生的总体膨胀变形量可达350με,随着距塔截面中心距离越远,膨胀变形越小。另外,随着水化进行,混凝土内相对湿度降低而产生自收缩变形。
In view of a single factor, the concrete deformation model under standard conditions can not truly evaluate the serviceability of concrete structures under the coupling of multiple fields. The physical mechanism of multi-field coupling of hydration, temperature and humidity in concrete is discussed, and the corresponding material deformation Calculate the model. The calculation example of the concrete of the bottom structure of the UHP Tata root at the Hu-Tong Yangtze River Bridge shows that the total amount of expansion and deformation caused by the early hydration heat stress of the mass concrete reaches 350με. The farther the deformation is, the farther away from the center of the section of the tower . In addition, as the hydration progresses, the relative humidity in the concrete decreases to produce self-shrinking deformation.