盐腐蚀后混凝土的动态本构模型

发布时间：2018-03-11 03:29

  本文选题：盐腐蚀　切入点：混凝土　出处：《爆炸与冲击》2017年04期 　论文类型：期刊论文

【摘要】：为探究混凝土受盐腐蚀后的动态力学响应,配置了粉煤灰质量分数为15%的普通硅酸盐水泥混凝土,将其置于质量分数均为15%的NaCl和Na_2SO_4溶液中浸泡腐蚀60d后,利用?100mm分离式霍普金森压杆实验装置,测试其受腐蚀后的动态力学性能,并结合宏观唯象损伤统计理论和Weibull分布思想,建立了混凝土受盐腐蚀后的动态统计损伤本构模型。结果表明:受盐腐蚀后,混凝土试件的动态抗压强度均有不同程度的下降,且NaCl溶液腐蚀试件的降幅大于Na_2SO_4溶液腐蚀试件;模型曲线与实验曲线的拟合度较高,能够较准确地描述混凝土在冲击荷载作用下的动态力学响应规律。
[Abstract]:In order to investigate the dynamic mechanical response of concrete after salt corrosion, ordinary Portland cement concrete with 15% mass fraction of fly ash was placed in NaCl and Na_2SO_4 solution with 15% mass fraction for 60 days. The dynamic mechanical properties of 100mm split Hopkinson pressure bar after corrosion were tested, and the macroscopic phenomenological damage statistics theory and Weibull distribution thought were combined. The dynamic statistical damage constitutive model of concrete after salt corrosion is established. The results show that the dynamic compressive strength of concrete specimens decreases in varying degrees after salt corrosion, and the decrease of NaCl solution corrosion specimen is greater than that of Na_2SO_4 solution corrosion specimen. The fitting degree between the model curve and the experimental curve is high, which can accurately describe the dynamic mechanical response of concrete under impact load.
【作者单位】： 空军工程大学机场建筑工程系;解放军理工大学爆炸冲击防灾减灾国家重点实验室;西北工业大学力学与土木建筑学院;中央军委后勤保障部建筑工程规划设计研究院;
【基金】：国家自然科学基金项目(51078350,51208507) 爆炸冲击防灾减灾国家重点实验室开放课题(DPMEIKF201406) 陕西省青年科技新星计划项目(2013KJXX-81)
【分类号】：TU528
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本文编号：1596397