反复荷载作用下钢筋与冻融损伤混凝土粘结性能的试验研究
发布时间：2019-05-09 13:54
【摘要】：我国广大地区处于严寒地带，在这些地区，冻融损伤破坏是结构耐久性损伤破坏的重要原因之一。开展单调与反复荷载作用下钢筋与冻融损伤混凝土粘结-滑移本构关系研究，，为构件非线性分析提供基础数据，可以进一步完善既有钢筋混凝土结构抗震性能评估理论，同时对混凝土结构工程防灾减灾具有重大的理论意义和工程价值。 本文首先对C30、C40、C50三种强度的钢筋混凝土试件进行了0次、100次、200次、300次的快速冻融试验，得到了冻融循环次数与混凝土试件质量损失率的关系。随后对试件进行加载试验，得到了不同强度不同冻融循环次数下钢筋与混凝土试件在单调与反复荷载作用下的粘结-滑移曲线，分析了曲线特征及峰值粘结应力与冻融循环次数的关系。 结合试验数据，建立了反复荷载作用下冻融损伤混凝土粘结-滑移本构关系的理论模型。提出了6段式本构关系表达式，并进一步确定了理论模型所需的关键参数及相关参数的求法。建立了相关关键参数与冻融循环次数的关系。
[Abstract]:In these areas, freeze-thaw damage is one of the important reasons for durability damage of structures. The bond-slip constitutive relationship between reinforcement and freeze-thaw damaged concrete under monotone and repeated loads is studied, which provides basic data for nonlinear analysis of members and can further improve the seismic performance evaluation theory of existing reinforced concrete structures. At the same time, it is of great theoretical significance and engineering value for disaster prevention and mitigation of concrete structure engineering. In this paper, the rapid freeze-thaw tests of C30, C40 and C50 reinforced concrete specimens with three strengths of 0 times, 100 times, 200 times and 300 times are carried out, and the relationship between the number of freeze-thaw cycles and the mass loss rate of concrete specimens is obtained. Then the bond-slip curves of steel bar and concrete specimens under monotone and cyclic loading are obtained under different strength and different freeze-thaw cycles. The relationship between the curve characteristics, the peak bond stress and the number of freeze-thaw cycles is analyzed. Based on the experimental data, the theoretical model of bond-slip constitutive relation of freeze-thaw damaged concrete under cyclic loading is established. The expression of six-segment constitutive relation is put forward, and the key parameters needed for the theoretical model and the method for finding the related parameters are further determined. The relationship between the key parameters and the number of freeze-thaw cycles is established.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU375
本文编号：2472814
[Abstract]:In these areas, freeze-thaw damage is one of the important reasons for durability damage of structures. The bond-slip constitutive relationship between reinforcement and freeze-thaw damaged concrete under monotone and repeated loads is studied, which provides basic data for nonlinear analysis of members and can further improve the seismic performance evaluation theory of existing reinforced concrete structures. At the same time, it is of great theoretical significance and engineering value for disaster prevention and mitigation of concrete structure engineering. In this paper, the rapid freeze-thaw tests of C30, C40 and C50 reinforced concrete specimens with three strengths of 0 times, 100 times, 200 times and 300 times are carried out, and the relationship between the number of freeze-thaw cycles and the mass loss rate of concrete specimens is obtained. Then the bond-slip curves of steel bar and concrete specimens under monotone and cyclic loading are obtained under different strength and different freeze-thaw cycles. The relationship between the curve characteristics, the peak bond stress and the number of freeze-thaw cycles is analyzed. Based on the experimental data, the theoretical model of bond-slip constitutive relation of freeze-thaw damaged concrete under cyclic loading is established. The expression of six-segment constitutive relation is put forward, and the key parameters needed for the theoretical model and the method for finding the related parameters are further determined. The relationship between the key parameters and the number of freeze-thaw cycles is established.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU375
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