反复荷载作用下钢筋与碳化混凝土粘结性能试验研究

发布时间：2019-06-14 09:05

【摘要】：碳化是造成混凝土结构耐久性损伤的主要因素之一，对混凝土力学性能产生很大影响。钢筋混凝土结构能够正常工作是基于钢筋与混凝土二者的粘结作用。碳化改变了混凝土自身性能，从而导致钢筋混凝土结构粘结性能下降。然而，目前针对钢筋与碳化混凝土粘结性能的理论数据和试验研究还很匮乏，本论文对反复荷载作用下钢筋与碳化混凝土的粘结性能进行试验研究，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。论文首先采用C20、C30、C40三批钢筋混凝土试件进行完全碳化试验，并通过标准立方体试件测定出未碳化和完全碳化混凝土的抗拉强度，然后通过反复加载试验，对试件施加单调及反复荷载，得到每批试件在单调和反复荷载作用下的粘结—滑移曲线。同样，，对相同批次的未碳化试件施加单调及反复荷载，得到相应的粘结—滑移曲线。其次，论文通过对未碳化和完全碳化试件的粘结—滑移曲线进行比较，分析碳化对钢筋混凝土粘结性能的影响，通过引入粘结应力退化率，说明了反复加载循环次数对于钢筋混凝土粘结性能的影响，并全面分析对比了未碳化和完全碳化后钢筋混凝土试件的粘结性能。再次，论文通过采用单调及反复荷载试验，重点研究分析了混凝土碳化这一因素，对钢筋混凝土粘结性能的影响，建立了反复荷载作用下钢筋与完全碳化混凝土粘结性能的本构关系，为分析反复荷载作用下钢筋与碳化混凝土的粘结性能打下了基础。本文基于反复荷载作用下钢筋与碳化混凝土粘结性能的试验研究成果，掌握了钢筋与碳化混凝土粘结规律，深化了对此粘结规律的认识，为日后实践提供了理论依据。
[Abstract]:Carbonation is one of the main factors causing durability damage of concrete structures, which has a great impact on the mechanical properties of concrete. The normal operation of reinforced concrete structure is based on the bond between steel bar and concrete. Carbonation changes the performance of concrete itself, which leads to the decrease of bond behavior of reinforced concrete structure. However, at present, there is still a lack of theoretical data and experimental research on the bond behavior between steel bar and carbonized concrete. In this paper, the experimental study on the bond behavior between steel bar and carbonized concrete under cyclic loading can further improve the existing seismic performance evaluation theory of reinforced concrete structures. At the same time, it is of great theoretical significance and engineering value for concrete structure engineering disaster prevention and mitigation. In this paper, three batches of reinforced concrete specimens, C20, C30 and C40, are used to carry out complete carbonation tests, and the tensile strength of uncarbonized and fully carbonized concrete is measured by standard cube specimens. Then, the bond-slip curves of each batch of specimens under monotone and repeated loads are obtained by applying monotonic and repeated loads to the specimens through repeated loading tests. Similarly, the corresponding bond-slip curves are obtained by applying monotone and repeated loads to the uncarbonized specimens of the same batch. Secondly, by comparing the bond-slip curves of uncarbonized and fully carbonized specimens, this paper analyzes the effect of carbonation on the bond properties of reinforced concrete, explains the influence of cyclic times of repeated loading on the bond properties of reinforced concrete by introducing the bond stress degradation rate, and comprehensively analyzes and compares the bond properties of reinforced concrete specimens after carbonation and complete carbonation. Thirdly, by means of monotone and cyclic load tests, this paper focuses on the influence of concrete carbonation on the bond behavior of reinforced concrete, and establishes the constitutive relation of bond behavior between steel bar and fully carbonized concrete under cyclic loading, which lays a foundation for analyzing the bond behavior between steel bar and carbonized concrete under cyclic loading. Based on the experimental results of bond behavior between steel bar and carbonized concrete under cyclic loading, this paper grasps the bond law between steel bar and carbonized concrete, deepens the understanding of this bond law, and provides a theoretical basis for future practice.
【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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