CFS加固RC箱梁的斜截面承载力分析与试验研究
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摘要
箱形梁桥具有抗扭刚度大,整体性能好的特点,是我国公路桥梁中十分常见的桥型。然而,目前大量箱梁桥在使用阶段便在腹板上产生较多的斜裂缝,这些裂缝的存在对结构产生了十分不利的影响。因此,有必要采取有效的处理措施,以保证构件的使用功能。碳纤维布(CFS)以其抗拉强度高、重量轻、极好的耐腐蚀性能及耐久性等优点,已经在桥梁结构加固工程中得到了应用。然而目前还缺少利用CFS加固箱梁斜截面承载力这方面的研究。本文结合湖南省自然科学基金项目《碳纤维布加固预应力混凝土连续箱梁桥极限承载力分析》,采用有限元分析和试验研究相结合的方法,对CFS加固RC箱梁的斜截面承载力进行理论与试验研究。
根据非线性有限元理论,借助ANSYS提供的参数化语言APDL,建立CFS加固RC箱梁的三维非线性有限元分析模型,对箱梁进行斜截面承载力分析。
针对箱梁桥的开裂特点与受力情况,制作4根RC箱梁并进行CFS加固RC箱梁的模型试验,通过逐级加载,研究CFS加固RC箱梁斜截面强度时的破坏全过程;分析CFS加固RC箱梁斜截面的受力特点和加固箱梁极限承载力的变化;探讨CFS加固箱梁的破坏机理及加固效果。
对有限元计算结果与试验结果进行对比分析,进一步验证了理论计算模型的正确性;按照理论分析计算的方法,对某预应力混凝土连续箱梁桥用CFS加固进行有限元模拟计算,得到了有益的结论。
通过理论分析、模型试验和工程背景的研究,提出了用CFS加固箱梁桥的分析计算方法;根据本文的计算、试验和其他文献的结果,对现有规范的计算公式提出了修正建议,可供同类问题参考。
The box-beam bridge which has greater torsional rigidity and better integrity behavior is quite a common one in Chinese highway bridges. However, a large number of box-beam bridges, only in the use stage, have already generated many oblique cracks on the web, which has quite a negative impact on the structure. Therefore, it is necessary to take effective measures to guarantee the use function of the structure. Carbon fiber sheet (CFS), which has been applied in the reinforcement of the bridge structural engineering, presents several advantages, such as high tensile strength, light weight, excellent corrosion resistance and durability. However, there is a lack of the research on using CFS strengthening the inclined section bearing capacity of box beams at present. Combined with the Natural Science Fund Project of Hunan Province,“Ultimate Load Analysis of PC Continuous Thin-Walled Box Beam Bridge Strengthened with CFS”, this thesis takes the method of finite element analysis and experimental study to research the inclined section bearing capacity of the reinforced concrete box beams strengthened with CFS.
Based on the nonlinear finite element theory and the parametric design language (APDL) provided by ANSYS, the three-dimensional nonlinear finite element analysis model of the reinforced concrete box beams strengthened with CFS is established, and the analysis of ultimate load is done to study the behavior of the box beams.
Considering the split characteristic and force condition of box-beam bridge, four RC box beams are made and the model test of the RC box beams strengthened with CFS is done. The whole damage process of the RC box beams strengthened with CFS is observed, and the mechanical behavior of the oblique section of the box beams is analyzed. The influence of CFS on the ultimate load of the box beams is studied in order to realize the failure mechanism and strengthening effect.
Comparing the calculated results with the experimental results, the model is verified to be rationality. Based on the above work, the finite element analysis model of PC continuous thin-walled box-beam bridge strengthened with CFS is established and the calculation of the ultimate load is done to analyze the ultimate load of bridge structures before and after strengthening. Then some helpful conclusions come.
According to the theoretical and experimental research and the analysis of engineering background, calculation method of the box-beam bridge strengthened with CFS is put forward. Based on this experimental results and related literature findings, the shearing force formula related CFS in the existing regulations is revised, which provides the reference for engineering design.
根据非线性有限元理论,借助ANSYS提供的参数化语言APDL,建立CFS加固RC箱梁的三维非线性有限元分析模型,对箱梁进行斜截面承载力分析。
针对箱梁桥的开裂特点与受力情况,制作4根RC箱梁并进行CFS加固RC箱梁的模型试验,通过逐级加载,研究CFS加固RC箱梁斜截面强度时的破坏全过程;分析CFS加固RC箱梁斜截面的受力特点和加固箱梁极限承载力的变化;探讨CFS加固箱梁的破坏机理及加固效果。
对有限元计算结果与试验结果进行对比分析,进一步验证了理论计算模型的正确性;按照理论分析计算的方法,对某预应力混凝土连续箱梁桥用CFS加固进行有限元模拟计算,得到了有益的结论。
通过理论分析、模型试验和工程背景的研究,提出了用CFS加固箱梁桥的分析计算方法;根据本文的计算、试验和其他文献的结果,对现有规范的计算公式提出了修正建议,可供同类问题参考。
The box-beam bridge which has greater torsional rigidity and better integrity behavior is quite a common one in Chinese highway bridges. However, a large number of box-beam bridges, only in the use stage, have already generated many oblique cracks on the web, which has quite a negative impact on the structure. Therefore, it is necessary to take effective measures to guarantee the use function of the structure. Carbon fiber sheet (CFS), which has been applied in the reinforcement of the bridge structural engineering, presents several advantages, such as high tensile strength, light weight, excellent corrosion resistance and durability. However, there is a lack of the research on using CFS strengthening the inclined section bearing capacity of box beams at present. Combined with the Natural Science Fund Project of Hunan Province,“Ultimate Load Analysis of PC Continuous Thin-Walled Box Beam Bridge Strengthened with CFS”, this thesis takes the method of finite element analysis and experimental study to research the inclined section bearing capacity of the reinforced concrete box beams strengthened with CFS.
Based on the nonlinear finite element theory and the parametric design language (APDL) provided by ANSYS, the three-dimensional nonlinear finite element analysis model of the reinforced concrete box beams strengthened with CFS is established, and the analysis of ultimate load is done to study the behavior of the box beams.
Considering the split characteristic and force condition of box-beam bridge, four RC box beams are made and the model test of the RC box beams strengthened with CFS is done. The whole damage process of the RC box beams strengthened with CFS is observed, and the mechanical behavior of the oblique section of the box beams is analyzed. The influence of CFS on the ultimate load of the box beams is studied in order to realize the failure mechanism and strengthening effect.
Comparing the calculated results with the experimental results, the model is verified to be rationality. Based on the above work, the finite element analysis model of PC continuous thin-walled box-beam bridge strengthened with CFS is established and the calculation of the ultimate load is done to analyze the ultimate load of bridge structures before and after strengthening. Then some helpful conclusions come.
According to the theoretical and experimental research and the analysis of engineering background, calculation method of the box-beam bridge strengthened with CFS is put forward. Based on this experimental results and related literature findings, the shearing force formula related CFS in the existing regulations is revised, which provides the reference for engineering design.
引文
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