盐冻融环境下钢筋混凝土黏结-滑移本构模型

发布时间：2018-03-06 02:10

  本文选题：钢筋混凝土　切入点：本构模型　出处：《建筑材料学报》2017年05期 　论文类型：期刊论文

【摘要】：为了探索盐冻融环境下钢筋混凝土的黏结-滑移性能及其本构模型,通过自主研制的双向受压型钢筋混凝土拉拔装置和钢筋铣槽内贴应变片的测试方法,对经历了盐冻融循环作用的钢筋混凝土试件进行中心拉拔试验.结果表明:随着盐冻融循环次数的增加,试件的极限黏结强度呈线性下降趋势,自由端起滑荷载逐渐减小,劈裂破坏时的自由端滑移量先减小后增大;加载初期黏结应力峰值靠近加载端,随着荷载的增加,黏结应力峰值向自由端移动,且随试件盐冻融损伤程度的增加,峰值移动趋势愈趋明显.结合理论分析,获得了试件的黏结应力和滑移量沿锚固长度分布规律,并在此基础上构建了盐冻融环境下考虑位置函数的钢筋混凝土黏结-滑移本构模型.所得结果可为寒区氯盐环境下钢筋混凝土构件的有限元分析和耐久性评估提供理论依据.
[Abstract]:In order to explore the cement-slip behavior of reinforced concrete and its constitutive model under salt freeze-thaw environment, the self-developed bidirectional compression type reinforced concrete drawing device and the test method of strain gauges in the milling groove of steel bar were developed. The central drawing test of reinforced concrete specimens subjected to salt freezing and thawing cycles is carried out. The results show that with the increase of salt freezing and thawing cycles, the ultimate bond strength of the specimens decreases linearly, and the sliding load at the free end decreases gradually. At the beginning of loading, the peak value of bond stress is close to the loading end, and with the increase of load, the peak value of bond stress moves to the free end, and the damage degree increases with the freezing and thawing of salt. The trend of peak movement is becoming more and more obvious. Based on the theoretical analysis, the distribution of bond stress and slip along the anchoring length is obtained. On this basis, a reinforced concrete cement-slip constitutive model considering the position function in the freezing and thawing environment is constructed. The results can provide a theoretical basis for the finite element analysis and durability evaluation of reinforced concrete members under the cold chloride environment.
【作者单位】： 三峡大学防灾减灾湖北省重点实验室;三峡大学土木与建筑学院;
【基金】：国家自然科学基金资助项目(51379111,51109121) 湖北省科技支撑计划项目(2014BCB035)
【分类号】：TU528
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本文编号：1572871