碳纤维布加固木梁的受力性能研究
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摘要
木结构是我国古建筑的主要形式,具有极高的历史,艺术和科学价值。但是在经历了几百年甚至几千年的风雨洗礼后,保存下来的古建筑很多都破损严重,急待进行维修和加固。碳纤维布由于其易于施工,对结构重量和外表几乎不产生影响而被广泛地应用于木结构加固。针对于此,本文对碳纤维布加固木梁的受力性能进行了研究。
通过对不同初始荷载和碳纤维布层数的矩形木梁进行抗弯试验,研究了木梁的破坏特征、荷载—挠度、应变分布和极限承载力。试验结果表明,木梁经加固后,承载力有所提高,变形性能也得到改善。
针对未加固的木梁和加固后的木梁,分别建立了分析模型。根据加固梁不同的破坏模式,建立了相应的抗弯承载力计算公式以及考虑初始荷载的承载力计算公式。理论计算值和试验结果吻合较好。无论试验还是理论分析都表明,初始荷载大小对承载力和变形有较大影响。
运用C语言程序对碳纤维布加固梁的跨中截面的弯矩—曲率、荷载—挠度等关系曲线进行非线性模拟分析。比较模拟结果和试验结果,可知程序计算精度较高,模拟计算可以用于木梁加固参数分析,并可应用于工程加固设计
以胶层剪切滑移变形为基本参数,考虑木梁、碳纤维布及粘胶层性能对界面应力的影响,建立了弹性工作状态下加固梁的界面应力分析模型,推导出碳纤维布与木梁之间的粘结剪应力和剥离正应力的计算公式,并应用于最大界面应力的主要影响因素分析。
通过碳纤维布加固木梁的抗剪性能试验,研究了木梁剪切破坏的特征、截面应变、极限承载力等受力性能。分析了试验中所出现的两种破坏形态的机理,并依据不同的破坏形态提出了木梁的抗剪承载力计算方法,提出了采用碳纤维布对木梁进行抗剪加固的加固方式建议。
Timber structure is the main form of Chinese ancient buildings and famous for its high historical, artistic and scientific value. However, many timber structures have been severely damaged by wind and rain for hundreds or thousands of years. Thus, the reinforcement of the traditional ancient buildings is extremely urgent in present. In recent years, the Carbon Fiber Reinforced Plastic/Polymer (CFRP) sheets have been widely used to strengthen timber structures for the convenience in construction and no influence on the weight and appearance of structures. Therefore, the mechanical behavior of reinforced timber beams using CFRP sheets is studied in this dissertation.
An experimental program was conducted to test the flexural beaviour of rectangular timber beams strengthened by CFRP sheets considering the initial load and the number of CFRP layers. The flexural behaviour was examined in terms of the characteristics of failure, the load-deflection relationship, the strain distribution on the cross section of timber beams and the ultimate bearing capacity. The test results indicate that the ultimate load bearing capacity is greatly enhanced and the behavior of deformation of the strengthened timber beams improved.
Based on the experimental results, an analytical model was proposed to predict the flexural capacity of the plain timber beams and the reinforced timber beams. The formula of flexural capacity was established considering an initial load according to different models of failure. The calculation results show a good agreement with the experimental results. The experimental and theoretical results indicate that the initial load has significant influence on the stiffness and the deflection of the strengthened beams.
A C language program was developed for the nonlinear analysis of the timber beams with externally bonded CFRP sheets considering initial loads. The load-deflection relationship can be drawn out. The predictions of the program agree closely with the test data, which can be used in engineering practice.
An analytical model of interfacial stress was proposed for the CFRP-strengthened beams based on the shear-slip deformation of the adhesive layer. The formula for calculating shear stress and normal stress in the interfacial bond between the CFRP sheet and the timber beam were deduced, which were applied to analyze the main factors influencing the maximum interfacial bond stress.
Based on the experimental study on the shear property of timber beams strengthened with CFRP sheets, the pattern of shearing failure, the cross section strain and the shear capacity were obtained. The mechanism of two main kinds of shearing failure models were analyzed. The formula of shear capacity were proposed for different failure models. The pattern of strengthening shearing performance of timber beams with CFRP was proposed.
通过对不同初始荷载和碳纤维布层数的矩形木梁进行抗弯试验,研究了木梁的破坏特征、荷载—挠度、应变分布和极限承载力。试验结果表明,木梁经加固后,承载力有所提高,变形性能也得到改善。
针对未加固的木梁和加固后的木梁,分别建立了分析模型。根据加固梁不同的破坏模式,建立了相应的抗弯承载力计算公式以及考虑初始荷载的承载力计算公式。理论计算值和试验结果吻合较好。无论试验还是理论分析都表明,初始荷载大小对承载力和变形有较大影响。
运用C语言程序对碳纤维布加固梁的跨中截面的弯矩—曲率、荷载—挠度等关系曲线进行非线性模拟分析。比较模拟结果和试验结果,可知程序计算精度较高,模拟计算可以用于木梁加固参数分析,并可应用于工程加固设计
以胶层剪切滑移变形为基本参数,考虑木梁、碳纤维布及粘胶层性能对界面应力的影响,建立了弹性工作状态下加固梁的界面应力分析模型,推导出碳纤维布与木梁之间的粘结剪应力和剥离正应力的计算公式,并应用于最大界面应力的主要影响因素分析。
通过碳纤维布加固木梁的抗剪性能试验,研究了木梁剪切破坏的特征、截面应变、极限承载力等受力性能。分析了试验中所出现的两种破坏形态的机理,并依据不同的破坏形态提出了木梁的抗剪承载力计算方法,提出了采用碳纤维布对木梁进行抗剪加固的加固方式建议。
Timber structure is the main form of Chinese ancient buildings and famous for its high historical, artistic and scientific value. However, many timber structures have been severely damaged by wind and rain for hundreds or thousands of years. Thus, the reinforcement of the traditional ancient buildings is extremely urgent in present. In recent years, the Carbon Fiber Reinforced Plastic/Polymer (CFRP) sheets have been widely used to strengthen timber structures for the convenience in construction and no influence on the weight and appearance of structures. Therefore, the mechanical behavior of reinforced timber beams using CFRP sheets is studied in this dissertation.
An experimental program was conducted to test the flexural beaviour of rectangular timber beams strengthened by CFRP sheets considering the initial load and the number of CFRP layers. The flexural behaviour was examined in terms of the characteristics of failure, the load-deflection relationship, the strain distribution on the cross section of timber beams and the ultimate bearing capacity. The test results indicate that the ultimate load bearing capacity is greatly enhanced and the behavior of deformation of the strengthened timber beams improved.
Based on the experimental results, an analytical model was proposed to predict the flexural capacity of the plain timber beams and the reinforced timber beams. The formula of flexural capacity was established considering an initial load according to different models of failure. The calculation results show a good agreement with the experimental results. The experimental and theoretical results indicate that the initial load has significant influence on the stiffness and the deflection of the strengthened beams.
A C language program was developed for the nonlinear analysis of the timber beams with externally bonded CFRP sheets considering initial loads. The load-deflection relationship can be drawn out. The predictions of the program agree closely with the test data, which can be used in engineering practice.
An analytical model of interfacial stress was proposed for the CFRP-strengthened beams based on the shear-slip deformation of the adhesive layer. The formula for calculating shear stress and normal stress in the interfacial bond between the CFRP sheet and the timber beam were deduced, which were applied to analyze the main factors influencing the maximum interfacial bond stress.
Based on the experimental study on the shear property of timber beams strengthened with CFRP sheets, the pattern of shearing failure, the cross section strain and the shear capacity were obtained. The mechanism of two main kinds of shearing failure models were analyzed. The formula of shear capacity were proposed for different failure models. The pattern of strengthening shearing performance of timber beams with CFRP was proposed.
引文
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