CFRP-高强混凝土柱受力性能试验研究
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摘要
碳纤维复合材料由于强度高、耐腐蚀、重量轻、施工方便等优点在混凝土结构补强加固及维修中得到广泛应用。目前国内外关于CFRP加固混凝土研究多以加固普通混凝土结构为主,近年来,高强混凝土的广泛应用,高层超高层建筑日益增多,高强混凝土的补强加固问题应得到足够的重视。为了建筑技术的需求,本文对CFRP加固高强混凝土柱的多种受力性能进行了系统的试验研究和分析,研究建议CFRP加固高强混凝土柱的设计方法,主要内容包括：
1.查阅大量国内外文献,对FRP加固混凝土技术的应用及发展现状进行了回顾和总结。
2.对CFRP加固高强混凝土偏心受压柱进行研究。共设计16根高强混凝土柱分别采用纤维布横向约束和受拉区纵向粘贴两种加固方式,综合考虑偏心距、纤维布加固量、纤维布粘贴形式以及受荷历史等因素的影响,建立符合现有规范的加固计算方法。
3.对CFRP加固高强混凝土柱在低周反复荷载作用下的正截面受力性能进行了研究。共设计13根柱进行了加载试验,分别考虑受拉破坏和受压破坏采用横向约束和受拉区纵向粘贴碳纤维布的加固方法,分析承载力、应变发展及滞回特性,试验表明,横向约束对受拉破坏柱承载力提高效果明显,而对受拉破坏加固效果不明显。受拉区纵向粘贴纤维布对受拉破坏有较好的效果,但由于没有足够的锚固长度,碳纤维布抗拉强度不能充分发挥,影响加固效果。
4.对基于正截面破坏的高强混凝土柱抗震性能进行了研究。共设计8根高强混凝土柱,采用碳纤维布横向全包方式进行加固,采用低周反复荷载进行拟静载试验,并与正截面受力研究中横向约束的7根柱进行比较,其中考虑了轴压比、纤维布加固量、受荷历史等因素。试验表明,纤维布横向约束高强混凝土,对于大偏压承载力没有明显效果,但延性、耗能等抗震性能明显提高；对于小偏压构件,承载力有较大幅度提高,抗震性能明显增强。
5.对基于斜截面破坏的高强混凝土柱抗震性能进行了研究。共设计11根高强混凝土柱,采用碳纤维布横向粘贴进行加固,考虑三种轴压比及不同的加固方式,同时考虑柱与损伤情况,采用低周反复荷载进行拟静载试验。试验表明,横向粘贴碳纤维布对高强混凝土柱承载力提高效果显著,延性耗能能力大幅度提高,最后,结合试验建议了承载力计算公式。
6.用有限元方法分析低周反复荷载作用下加固柱的受力性能,建立有限元分析模型并与试验结果进行比较,两者结果符合较好。
Carbon Fiber Reinforced Plastic(CFRP) has been widely used in the retrofitting, repairs and strengthening of existing concrete structures due to its excellent features, such as high strength to weight ratio, superior corrosion resistance and simplicity in the application and so on. Nowadays most research interests are mainly placed on the normal concrete strengthened by CFRP. High-strength concrete strengthened by CFRP, however, should deserve much attention since high-rise, even super high-rise buildings have developed so quickly in recent years. For the sake of building techniques, mechanical properties of high-strength concrete columns strengthened by CFRP were systematically and experimentally investigated, thereafter its corresponding strengthening design method was developed. The main research work is summarized as follows.
1. The application and development of technique for FPR-strengthening concrete were reviewed and summarized after much literature review from both at home and abroad.
2. Mechanical properties of CFRP-strengthened high-strength concrete columns under eccentric compression were studied. For that purpose,16columns enhanced with either transverse or longitudinal CFRP were fabricated and tested to consider the influences of the eccentricity, reinforcement rate and type as well as loading history. Consequently, a computation method for enhancement was developed in accordance with the current pertinent codes.
3. Mechanical properties of normal section of CFRP-reinforced concrete column under low-cycle fatigue loading were analyzed. In this study,13columns were fabricated with CFRP attached transversally or longitudinally in the tensile region and tested under tension or compression. Ultimate resistance, strain evolution and hysteretic behavior observed in the test elucidated the increase in the ultimate load of transversally confined column under tension loading. CFRP sheet longitudinally installed in tension region has preferable performance in tension failure. Nevertheless, the fact that anchorage length is not enough prohibits the full use of the tensile strength of CFRP sheet.
4. Seismic behavior of high-strength concrete columns experiencing normal section failure was studied. The quasi-static experiments were undertaken on8high-strength concrete columns fully wrapped in continuous CFRP under low-cycle fatigue loading. In the meantime, other7reference columns transversally confined were used for coMParisons. In this work, several parameters were studied, the most significant being axial compression ratio, the rate and type of fiber sheet as well as the loading history. The results show that for the large eccentric compressive columns, the gain in load is rather limited, but increase in ductility and energy dissipation is obvious. For small eccentric compressive columns, however, both load and ductility gains are noticeable.
5. Seismic behavior of high-strength concrete columns experiencing inclined section failure was studied. The quasi-static and low-cycle fatigue tests were conducted on11 high-strength concrete columns reinforced with CFRP sheet transversally installed, where three axial compression ratios, different reinforcement types, and damages of columns were considered. The results show a substantial increase in both resistance and ductility. Finally, one calculation formula for load-carrying capacity is recommended.
6. The fatigue performance of CFRP-reinforced concrete columns was modeled using finite element analysis. CoMParison with the experiment data shows favorable agreement.
1.查阅大量国内外文献,对FRP加固混凝土技术的应用及发展现状进行了回顾和总结。
2.对CFRP加固高强混凝土偏心受压柱进行研究。共设计16根高强混凝土柱分别采用纤维布横向约束和受拉区纵向粘贴两种加固方式,综合考虑偏心距、纤维布加固量、纤维布粘贴形式以及受荷历史等因素的影响,建立符合现有规范的加固计算方法。
3.对CFRP加固高强混凝土柱在低周反复荷载作用下的正截面受力性能进行了研究。共设计13根柱进行了加载试验,分别考虑受拉破坏和受压破坏采用横向约束和受拉区纵向粘贴碳纤维布的加固方法,分析承载力、应变发展及滞回特性,试验表明,横向约束对受拉破坏柱承载力提高效果明显,而对受拉破坏加固效果不明显。受拉区纵向粘贴纤维布对受拉破坏有较好的效果,但由于没有足够的锚固长度,碳纤维布抗拉强度不能充分发挥,影响加固效果。
4.对基于正截面破坏的高强混凝土柱抗震性能进行了研究。共设计8根高强混凝土柱,采用碳纤维布横向全包方式进行加固,采用低周反复荷载进行拟静载试验,并与正截面受力研究中横向约束的7根柱进行比较,其中考虑了轴压比、纤维布加固量、受荷历史等因素。试验表明,纤维布横向约束高强混凝土,对于大偏压承载力没有明显效果,但延性、耗能等抗震性能明显提高；对于小偏压构件,承载力有较大幅度提高,抗震性能明显增强。
5.对基于斜截面破坏的高强混凝土柱抗震性能进行了研究。共设计11根高强混凝土柱,采用碳纤维布横向粘贴进行加固,考虑三种轴压比及不同的加固方式,同时考虑柱与损伤情况,采用低周反复荷载进行拟静载试验。试验表明,横向粘贴碳纤维布对高强混凝土柱承载力提高效果显著,延性耗能能力大幅度提高,最后,结合试验建议了承载力计算公式。
6.用有限元方法分析低周反复荷载作用下加固柱的受力性能,建立有限元分析模型并与试验结果进行比较,两者结果符合较好。
Carbon Fiber Reinforced Plastic(CFRP) has been widely used in the retrofitting, repairs and strengthening of existing concrete structures due to its excellent features, such as high strength to weight ratio, superior corrosion resistance and simplicity in the application and so on. Nowadays most research interests are mainly placed on the normal concrete strengthened by CFRP. High-strength concrete strengthened by CFRP, however, should deserve much attention since high-rise, even super high-rise buildings have developed so quickly in recent years. For the sake of building techniques, mechanical properties of high-strength concrete columns strengthened by CFRP were systematically and experimentally investigated, thereafter its corresponding strengthening design method was developed. The main research work is summarized as follows.
1. The application and development of technique for FPR-strengthening concrete were reviewed and summarized after much literature review from both at home and abroad.
2. Mechanical properties of CFRP-strengthened high-strength concrete columns under eccentric compression were studied. For that purpose,16columns enhanced with either transverse or longitudinal CFRP were fabricated and tested to consider the influences of the eccentricity, reinforcement rate and type as well as loading history. Consequently, a computation method for enhancement was developed in accordance with the current pertinent codes.
3. Mechanical properties of normal section of CFRP-reinforced concrete column under low-cycle fatigue loading were analyzed. In this study,13columns were fabricated with CFRP attached transversally or longitudinally in the tensile region and tested under tension or compression. Ultimate resistance, strain evolution and hysteretic behavior observed in the test elucidated the increase in the ultimate load of transversally confined column under tension loading. CFRP sheet longitudinally installed in tension region has preferable performance in tension failure. Nevertheless, the fact that anchorage length is not enough prohibits the full use of the tensile strength of CFRP sheet.
4. Seismic behavior of high-strength concrete columns experiencing normal section failure was studied. The quasi-static experiments were undertaken on8high-strength concrete columns fully wrapped in continuous CFRP under low-cycle fatigue loading. In the meantime, other7reference columns transversally confined were used for coMParisons. In this work, several parameters were studied, the most significant being axial compression ratio, the rate and type of fiber sheet as well as the loading history. The results show that for the large eccentric compressive columns, the gain in load is rather limited, but increase in ductility and energy dissipation is obvious. For small eccentric compressive columns, however, both load and ductility gains are noticeable.
5. Seismic behavior of high-strength concrete columns experiencing inclined section failure was studied. The quasi-static and low-cycle fatigue tests were conducted on11 high-strength concrete columns reinforced with CFRP sheet transversally installed, where three axial compression ratios, different reinforcement types, and damages of columns were considered. The results show a substantial increase in both resistance and ductility. Finally, one calculation formula for load-carrying capacity is recommended.
6. The fatigue performance of CFRP-reinforced concrete columns was modeled using finite element analysis. CoMParison with the experiment data shows favorable agreement.
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