基于材性的混凝土结构及构件冻融损伤模型试验研究

发布时间：2018-05-23 10:09

本文选题：混凝土结构 + 冻融　；参考：《振动与冲击》2016年03期

【摘要】：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。
[Abstract]:Based on Cai Hao model, the calculation method of maximum hydrostatic pressure in the model is improved by theoretical derivation and combined with the existing freeze-thaw test data. The fitting relationship between the water-cement ratio and the maximum freezing rate of concrete was established through 9 groups of material tests, and a simplified analytical formula for calculating the maximum hydrostatic pressure was derived. ANSYS finite element software is used to simulate the temperature field distribution of the member section, and a freeze-thaw damage model considering the temperature field correction is obtained. Finally, two groups of specimens are designed to verify the accuracy and reliability of the improved freeze-thaw damage model. The results show that the modified freeze-thaw damage model uses the dynamic elastic damage as the physical damage index. It can provide theoretical support for the study of freeze-thaw damage mechanism of RC members and structures.
【作者单位】：西安建筑科技大学土木工程学院;
【基金】：国家科技支撑计划(2013BAJ08B03) 国家自然科学基金(50978218;51108376) 教育部高等学校博士学科点专项科研基金(20136120110003) 陕西省科研项目(2012K12-03-01;2011KTCQ03-05;2013JC16)
【分类号】：TU37

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