外包GFRP板钢筋混凝土梁的力学性能研究
发布时间：2019-01-21 18:18
【摘要】：纤维增强复合材料(简称FRP)以其轻质高强、耐腐蚀性能好等优点在土木工程领域得到了广泛的关注和应用。为了改善沿海和海岛地区混凝土结构的耐久性问题,本课题设计了外包GFRP板钢筋混凝土构件,即采用U型GFRP板充当模板,使用中保护内部的钢筋混凝土免受侵蚀；同时GFRP与混凝土紧密结合,通过组合作用提高构件的受力性能,减少钢筋用量,并通过内部混凝土的填充有效增强GFRP板的整体和局部稳定性,避免其发生侧扭屈曲和局部屈曲破坏的可能。针对这种具有高耐久性的外包GFRP板钢筋混凝土构件,本文开展了以下几方面的工作： 1、对外包GFRP板钢筋混凝土梁及普通钢筋混凝土对比梁进行抗弯性能试验,结果表明外包GFRP板钢筋混凝土梁的抗弯承载力较普通钢筋混凝土对比梁的承载力有显著提高,但延性较差。 2、对外包GFRP板钢筋混凝土梁的弯曲破坏模式进行了划分和判别,引入受约束混凝土本构模型,提出了不同弯曲破坏模式下外包GFRP板钢筋混凝土矩形截面梁和T形截面梁的受弯承载力计算公式,计算值与试验值吻合较好。 3、对外包GFRP板钢筋混凝土梁及普通钢筋混凝土对比梁进行了抗剪性能试验,试验结果表明：外包GFRP板钢筋混凝土梁的抗剪承载力随着剪跨比的增大而减小。利用现有的抗剪承载力模型对外包GFRP板钢筋混凝土梁的抗剪承载力进行了验算,计算值与试验值吻合较好。 4、对外包GFRP板钢筋混凝土梁的弯矩-曲率关系进行了全过程分析,分析了外包GFRP板钢筋混凝土梁的延性,推导了外包GFRP板钢筋混凝土梁的短期抗弯刚度计算公式。 5、对外包GFRP板钢筋混凝土梁进行了真实海洋环境下的暴露试验,试验结果表明,真实海洋环境下试验梁的承载力和延性有显著的下降。分析了暴露试验梁结构性能退化的机理,并提出了其受弯承载力的退化模型。
[Abstract]:Fiber reinforced composite (FRP) has been widely used in the field of civil engineering due to its advantages of light and high strength and good corrosion resistance. In order to improve the durability of concrete structures in coastal and island areas, this paper designs the reinforced concrete members of outsourced GFRP slabs, that is, U-shaped GFRP slab is used as a template to protect the internal reinforced concrete from erosion. At the same time, GFRP and concrete are closely combined to improve the mechanical behavior of the members, reduce the amount of steel, and effectively enhance the overall and local stability of the GFRP slab through the filling of internal concrete. The possibility of lateral torsional buckling and local buckling failure is avoided. In view of this kind of reinforced concrete members with high durability, the following work has been done in this paper: 1. The flexural behavior tests are carried out on the reinforced concrete beams of the GFRP slab and the normal reinforced concrete contrast beams. The results show that the flexural capacity of reinforced concrete beams with GFRP slabs is significantly higher than that of conventional reinforced concrete beams, but the ductility is poor. 2. The bending failure modes of reinforced concrete beams with GFRP slabs are divided and distinguished, and the confined concrete constitutive model is introduced. The formulas for calculating the flexural capacity of reinforced concrete rectangular section beams and T-shaped beams of GFRP slabs under different bending failure modes are presented. The calculated values are in good agreement with the experimental values. 3. The shear behavior tests of reinforced concrete beams with GFRP slabs and normal reinforced concrete beams are carried out. The results show that the shear capacity of reinforced concrete beams with wrapped GFRP slabs decreases with the increase of shear span ratio. Based on the existing shear bearing capacity model, the shear bearing capacity of reinforced concrete beams with GFRP slabs is checked and calculated, and the calculated values are in good agreement with the experimental values. 4. The relationship between bending moment and curvature of reinforced concrete beams with GFRP slabs is analyzed. The ductility of reinforced concrete beams of GFRP slabs is analyzed, and the calculation formula of short-term flexural stiffness of reinforced concrete beams with GFRP slabs is derived. 5. Exposure tests of reinforced concrete beams with GFRP slabs are carried out in real marine environment. The experimental results show that the bearing capacity and ductility of test beams in real marine environment have decreased significantly. The mechanism of structural degradation of exposed test beams is analyzed, and the degradation model of its flexural capacity is proposed.
【学位授予单位】：浙江大学
【学位级别】：博士
【学位授予年份】：2013
【分类号】：TU375.1
[Abstract]:Fiber reinforced composite (FRP) has been widely used in the field of civil engineering due to its advantages of light and high strength and good corrosion resistance. In order to improve the durability of concrete structures in coastal and island areas, this paper designs the reinforced concrete members of outsourced GFRP slabs, that is, U-shaped GFRP slab is used as a template to protect the internal reinforced concrete from erosion. At the same time, GFRP and concrete are closely combined to improve the mechanical behavior of the members, reduce the amount of steel, and effectively enhance the overall and local stability of the GFRP slab through the filling of internal concrete. The possibility of lateral torsional buckling and local buckling failure is avoided. In view of this kind of reinforced concrete members with high durability, the following work has been done in this paper: 1. The flexural behavior tests are carried out on the reinforced concrete beams of the GFRP slab and the normal reinforced concrete contrast beams. The results show that the flexural capacity of reinforced concrete beams with GFRP slabs is significantly higher than that of conventional reinforced concrete beams, but the ductility is poor. 2. The bending failure modes of reinforced concrete beams with GFRP slabs are divided and distinguished, and the confined concrete constitutive model is introduced. The formulas for calculating the flexural capacity of reinforced concrete rectangular section beams and T-shaped beams of GFRP slabs under different bending failure modes are presented. The calculated values are in good agreement with the experimental values. 3. The shear behavior tests of reinforced concrete beams with GFRP slabs and normal reinforced concrete beams are carried out. The results show that the shear capacity of reinforced concrete beams with wrapped GFRP slabs decreases with the increase of shear span ratio. Based on the existing shear bearing capacity model, the shear bearing capacity of reinforced concrete beams with GFRP slabs is checked and calculated, and the calculated values are in good agreement with the experimental values. 4. The relationship between bending moment and curvature of reinforced concrete beams with GFRP slabs is analyzed. The ductility of reinforced concrete beams of GFRP slabs is analyzed, and the calculation formula of short-term flexural stiffness of reinforced concrete beams with GFRP slabs is derived. 5. Exposure tests of reinforced concrete beams with GFRP slabs are carried out in real marine environment. The experimental results show that the bearing capacity and ductility of test beams in real marine environment have decreased significantly. The mechanism of structural degradation of exposed test beams is analyzed, and the degradation model of its flexural capacity is proposed.
【学位授予单位】：浙江大学
【学位级别】：博士
【学位授予年份】：2013
【分类号】：TU375.1
【参考文献】
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