【作者】 崔强；

【导师】 李志业；

【作者基本信息】 西南交通大学 ， 桥梁与隧道工程， 2007， 硕士

【摘要】 近年来，随着混凝土结构数量的不断增多和使用期的增加，混凝土结构中钢筋腐蚀造成的结构耐久性降低和结构破坏已逐渐成为一个严重的问题。用玻璃纤维(GFRP)筋代替混凝土结构中的钢筋是解决上述问题的一个有效办法。国内对GFRP筋混凝土结构的研究，大部分只是关注其正截面的破坏，对其斜截面破坏研究的很少。因此，开展GFRP筋混凝土梁的斜截面抗剪性能的研究，是具有十分重要的理论意义和实用价值。本文从理论、试验、有限元分析、工程应用四个方面对GFRP筋混凝土结构斜截面抗剪性能进行了研究，得出了一系列斜截面承载力公式，并进行了说明、分析、相互验证。本文的主要研究内容和成果如下：1．介绍了目前混凝土结构斜截面抗剪能力的研究现状；从混凝土破坏准则、构件变形协调条件以及平衡方程等关系中，得出GFRP筋混凝土梁斜截面承载力的理论计算公式。通过对试验结果和非线性有限元计算结果的验证，证实了该系列理论计算公式对于发生剪压破坏的GFRP筋混凝土梁，其计算结果具有一定的正确性和可靠性。2．介绍了GFRP筋混凝土梁斜截面受剪性能试验；通过对斜截面应力的分析，验证了混凝土破坏时符合最大主拉应力准则，即斜截面混凝土最大主拉应力值超过了混凝土抗拉强度，构件斜截面出现裂缝；通过变化主筋类型、主筋面积、截面尺寸、剪跨比以及箍筋间距，对比不同试件的破坏形式、开裂荷载、极限荷载，分析影响GFRP筋混凝土梁斜截面承载力的因素；探讨GFRP筋混凝土梁斜截面裂缝及挠度的特征，提出斜裂缝和挠度的计算公式，并通过试验结果分析，确定了计算公式中的相关系数。3．通过有限元软件ADINA，对GFRP筋混凝土梁进行非线性有限元分析；介绍了在ADINA有限元软件中，对建模方法、单元选取、材料本构关系的定义、求解方法等讲行了详细说明；把有限元计算结果与试验结果、理论公式计算结果进行对比分析，验证理论公式和设计参数的可靠性。4．对GFRP筋混凝土构件斜截面抗剪能力的工程设计方法进行研究，得出其设计公式，确定GFRP筋对混凝土抗剪能力影响系数α_c为0.677，GFRP箍筋的极限抗拉应变为0.002，修正了截面限制条件和最小配箍率条件，从而指导工程设计；介绍了GFRP筋的一个工程应用实例：为了解决盾构法施工中端头井围护桩存在的问题，用GFRP筋代替盾构端头井围护桩中的钢筋，安全、省时、经济，具有很大的优越性；通过对GFRP筋在盾构端头井围护桩中的应用情况进行分析，确定GFRP筋混凝土构件斜截面抗剪能力的工程设计公式的可行性。最后，对全文进行了总结，指出了本文的创新点及值得进一步研究的问题。更多还原

【Abstract】 In recent years, with the growing quantity of concrete structures and its lifetime, it becomes serious issue gradually that the structural durability has decreased by the corrosion of steel bar. With Glass Fiber Reinforced Polymer (GFRP) bar instead of steel bar used in the concrete structure to solve the above problem is an effective method. The majority of domestic research about GFRP reinforced concrete structure pay attention to the destruction of its right section only, and very few to the destruction of its diagonal section. Therefore, it is of great theoretical and practical value to study the shear resistance properties of GFRP reinforced concrete members.In this article ,the shear resistance properties of GFRP reinforced concrete members are studied from four aspects ,which is the theory, the experiment, the finite element analysis, the project apply . It gives a series of formulas about shear strength, and carried on the mutual confirmation to them. Major research contents and contributions are as follows:1. The article presents the current research status about the shear resistance properties of concrete members ,and gives the theoretical formula about shear strength. In comparison to the test results, the accuracy and reliability of the method in the thesis are tested.2. The article presents the test about the shear strength of GFRP reinforced concrete beams; When maximum principal tensile stress of diagonal section over the tensile strength of concrete, the diagonal crack appears. It analyzes the factors which affecte of the shear strength, by comparing the failure mode, early diagonal cracking strength and ultimate shear strength of different specimens. It also explores the cracks and deflection properties of GFRP reinforced concrete beams, gives their formula, and determine the coefficient of their formula through analysis of the test results.3. Using finite element software ADINA, finite element simulation of GFRP reinforced concrete beams is accomplished. It is modeling method, selecting element, defining constitutive relationship of materials and solution method that are elaborated on in this paper. The reliability of theoretical methods as mentioned above is testified by compared with finite element method and experiment results.4. It has conducted the research to the designed method of the shear strength of GFRP reinforced concrete members, gives the design formula. It also confirms that the GFRP-influence coefficient is 0.677, limits the tensile strain of GFPR stirrups to 0.002 , requires section restrictions and a minimum amout of GFPR stirrups. It introduces a project application of the GFRP bars, and the feasibility of design method as mentioned above is testified by compared with the situation of its applicationWith summarizing the whole paper in the end, the innovation aspects of this paper and the issues worth further research are indicated.更多还原