箍筋锈蚀对约束混凝土应力—应变关系的影响研究
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摘要
在对锈蚀箍筋约束混凝土相关力学性能研究之前,首先应当确定锈蚀箍筋对约束混凝土应力-应变关系的影响,因为混凝土的应力-应变关系是混凝土材料的基本力学性质,是钢筋混凝土结构的强度、变形理论的基础。因此,研究箍筋锈蚀对约束混凝土应力-应变关系的影响具有重要的研究意义,可以为现有钢筋混凝土结构耐久性评定和剩余寿命预测提供更加详尽的理论依据。
本文针对钢筋混凝土构件中仅箍筋均匀锈蚀的情况,在已有研究成果的基础上,根据混凝土中箍筋约束作用的特点,分析得到了锈蚀螺旋箍筋和锈蚀矩形箍筋对核心混凝土有效侧向约束作用的理论公式,并在不考虑箍筋锈蚀造成的混凝土保护层锈裂损伤的前提下,以过镇海约束混凝土应力-应变全曲线模型为基础,建立了锈蚀箍筋约束混凝土应力-应变全曲线的理论模型；针对箍筋均匀锈蚀情况,利用ANSYS有限元软件,采用对箍筋周围混凝土施加均匀锈胀力的方法模拟了混凝土保护层锈裂损伤情况,并回归给出了箍筋锈蚀程度与保护层锈裂损伤程度的关系；基于有限元分析结果,讨论了箍筋锈蚀引起的保护层锈裂损伤对约束混凝土应力-应变全曲线的影响,并建立了理论模型；对箍筋锈蚀后因素的组合效应进行了分析,并建立了组合因素作用下的约束混凝土应力-应变全曲线模型。
When study on the mechanical properties of concrete of corrosion stirrup, first should be determined the impact of confined concrete stress-strain relations, because the concrete stress-strain relationship is the basic mechanical properties of concrete materials and is the foundation of strength and deformation theory of reinforced concrete structures. Therefore, the study on the confined concrete stress-strain relationship of corrosion stirrup has important significance for the evaluation of existing reinforced concrete structure durability and the life prediction to provide a more detailed theory.
Aiming at the only stirrup uniform corrosion problem of reinforced concrete member, the theoretical formula is deduced for the effective constraint of the core concrete of the spiral reinforcement corrosion and rust rectangular stirrups by the characteristics of the stirrup constraint. In addition, under the primise of without considering the spalling of concrete protective layer, the theoretical model of rusty stirrup concrete stress-strain Curves is established based of Guo Zhenhai restraint concrete stress-strain curve model. The cracking of concrete protective layer rust damage cover due to stirrups uniforme corrosion is simulated by using ANSYS finite element software, and give the relationship between the corroded and cracked. On the basis of the finite element analysis, the stirrup corrosion cracking caused by rust protective damage on the confined concrete stress-strain curves is discussed, and a theoretical model is established. The effects of combination factors after the stirrups corrosion is analyzed, and the stress-strain curve model under the combination of factors in the confined concrete is established.
本文针对钢筋混凝土构件中仅箍筋均匀锈蚀的情况,在已有研究成果的基础上,根据混凝土中箍筋约束作用的特点,分析得到了锈蚀螺旋箍筋和锈蚀矩形箍筋对核心混凝土有效侧向约束作用的理论公式,并在不考虑箍筋锈蚀造成的混凝土保护层锈裂损伤的前提下,以过镇海约束混凝土应力-应变全曲线模型为基础,建立了锈蚀箍筋约束混凝土应力-应变全曲线的理论模型；针对箍筋均匀锈蚀情况,利用ANSYS有限元软件,采用对箍筋周围混凝土施加均匀锈胀力的方法模拟了混凝土保护层锈裂损伤情况,并回归给出了箍筋锈蚀程度与保护层锈裂损伤程度的关系；基于有限元分析结果,讨论了箍筋锈蚀引起的保护层锈裂损伤对约束混凝土应力-应变全曲线的影响,并建立了理论模型；对箍筋锈蚀后因素的组合效应进行了分析,并建立了组合因素作用下的约束混凝土应力-应变全曲线模型。
When study on the mechanical properties of concrete of corrosion stirrup, first should be determined the impact of confined concrete stress-strain relations, because the concrete stress-strain relationship is the basic mechanical properties of concrete materials and is the foundation of strength and deformation theory of reinforced concrete structures. Therefore, the study on the confined concrete stress-strain relationship of corrosion stirrup has important significance for the evaluation of existing reinforced concrete structure durability and the life prediction to provide a more detailed theory.
Aiming at the only stirrup uniform corrosion problem of reinforced concrete member, the theoretical formula is deduced for the effective constraint of the core concrete of the spiral reinforcement corrosion and rust rectangular stirrups by the characteristics of the stirrup constraint. In addition, under the primise of without considering the spalling of concrete protective layer, the theoretical model of rusty stirrup concrete stress-strain Curves is established based of Guo Zhenhai restraint concrete stress-strain curve model. The cracking of concrete protective layer rust damage cover due to stirrups uniforme corrosion is simulated by using ANSYS finite element software, and give the relationship between the corroded and cracked. On the basis of the finite element analysis, the stirrup corrosion cracking caused by rust protective damage on the confined concrete stress-strain curves is discussed, and a theoretical model is established. The effects of combination factors after the stirrups corrosion is analyzed, and the stress-strain curve model under the combination of factors in the confined concrete is established.
引文
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