基于材性的混凝土结构及构件冻融损伤模型试验研究

摘要

Based on the Cai Hao model,through the theoretical derivation and the summing up of the freezing and thawing test data of material,the calculation method of maximum hydrostatic pressure in the model was improved.9 groups of material tests were conducted to establish the fitting relationship between the water-cement ratio of concrete and the maximum freezing rate,and to derive a simplified analytic calculation formula for maximum hydrostatic pressure.The ANSYS finite element software was used to simulate the temperature field on component sections and an improved freezie-thaw damage model with consideration of the temperature distribution was proposed.2 groups of experiments were implemented to verify the accuracy and reliability of the improved model.The results show that the revised freeze-thaw damage model using dynamic elastic modulus as a physical damage index can provide theoretical support to the freeze-thaw damage mechanism study of RC structures and members.%基于蔡昊模型，通过理论推导并结合既有冻融材性试验数据，对模型中最大静水压力计算方法进行改进。进行9组材性试验，建立了混凝土水灰比和最大结冰速率之间的拟合关系，推导出最大静水压力的简化解析计算公式。采用 ANSYS 有限元软件，对构件截面温度场分布进行了模拟，得到考虑温度场修正的冻融损伤模型。最后，设计2组试件，对改进冻融损伤模型的准确性与可靠性进行试验验证，结果表明：修正后的采用动弹模损伤作为物理损伤指标的冻融损伤模型，可为 RC 构件与结构层面冻融损伤机理研究提供理论支撑。