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外包GFRP板钢筋混凝土梁的力学性能研究
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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。
Fiber reinforced polymer(FRP) is achieved wide attention and application in civil engineering due to its low weight, high strength and good corrosion resistance.To improve the durability problem of concrete structures in coastal areas and islands, one type of reinforced concrete beam wrapped with GFRP plate was designed. This kind of GFRP plate is U-shaped which provides permanent shuttering for the system and protects the reinforced concrete from corrosion. The composite action between GFRP plate and concrete can increase the load-bearing capacity of hybrid beam and reduce the amount of reinforcing steel. The global and local stability of GFRP plate can be effectively strengthened through the inner filled concrete and therefore the possibility of lateral torsional buckling and local buckling failure in the GFRP webs can be avoided. The works presented herein were as follows:
     1. Experimentation on flexural behavior of GFRP-RC hybrid beams and the reference RC beam were conducted. Test results showed that hybrid beams provided significant increase in flexural capacity but decrease in ductility when compared with the control RC beam.
     2. According to the different flexural failure modes of hybrid beams with rectangular or T-shaped section, the corresponding flexural capacity formulae were presented, based on the constitutive model of confined concrete. The agreement between experiments and analysis was good.
     3. Tests on shear behavior of GFRP-RC hybrid beams and the reference RC beams were conducted. Results from the tests showed that the shear strength of hybrid beams increased with the decrease of shear span ratio. The existed shear capacity models were adopted to calculate the shear capacity of hybrid beams. The agreement between experiments and analysis was good.
     4. The moment-curvature relation and ductility for hybrid beams were analyzed. And the short term bending rigidity formula for hybrid beams was derived.
     5. Exposure tests on the GFRP-RC hybrid beams under the real marine environment were conducted. The test results showed that the capacity and ductility of hybrid beams decreased significantly under the real marine environment. The deterioration mechanism of structural properties for hybrid beams was analyzed and the flexural capacity model for the deteriorated hybrid beams was proposed.
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