Stress redistribution of RC beams strengthened with prestressed hybrid carbon/glass(C/G)fiber cloth
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摘要: 基于实体退化单元, 对钢筋混凝土(RC) 梁和混杂碳/玻璃(C/G) 纤维布采用分层壳元模型, 对纵向受力钢筋采用组合壳元模型, 模拟了混杂C/G纤维布的预应力作用, 建立了预应力混杂C/G纤维布加固RC梁的非线性层壳组合单元模型, 采用弥散裂缝模式、Ottosen屈服准则和Hinton压碎准则描述了加固梁的开裂、屈服和压碎的材料非线性效应, 分析了破坏全过程中加固梁挠度变化规律、刚度折减规律、极限承载力与混杂C/G纤维布应力重分布。计算结果表明: 非线性层壳组合单元分析方法可靠, 加固梁的特征荷载计算值与试验值的相对误差不超过10%, 且非线性层壳组合单元具有较好的收敛性和数值稳定性; 在加固梁达到开裂荷载前, 混杂C/G纤维布的应力重分布系数变化较小, 开裂荷载时为1.3, 其后应力重分布系数逐渐增大, 屈服荷载时为4.1, 极限荷载时为14.8;采用普通C/G纤维布加固时, 纤维布高强性能未充分发挥, 利用率约为83%, 采用预应力C/G纤维布能改善梁的结构体系, 能使得材料充分发挥作用, 利用率超过90%。
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关键词:
- 桥梁工程 /
- 混杂碳/玻璃(C/G)纤维布 /
- 预应力 /
- 钢筋混凝土梁 /
- 层壳组合单元
Abstract: Based on solid degraded shell element, the layered shell element model was adopted for reinforced concrete (RC) beam and hybrid carbon/glass (C/G) fiber cloth, the combined shell element model was used for longitudinal reinforcement, and the prestress effect of hybrid C/G fiber cloth was simulated.A kind of nonlinear layered shell combined element for RC beam strengthened with prestressed hybrid C/G fiber cloth was established.The nonlinear effects of cracking, yielding and crushing of RC beam were described by cracking mode, Ottosen yielding criterion and Hinton crushing criterion.The changing rule of deflection, the reduction rule of stiffness and the ultimate bearing capacity of strengthened beam were analyzed, and the stress redistribution of hybrid C/G fiber cloth was studied.Calculation result shows that the nonlinearlayer shell combined element analysis method is reliable, the relative error between the calculated value of characteristic load of strengthened beam and its experimental value is not more than10%, and the nonlinear layered shell combined element has good convergence and numerical stability.Before the strengthened beam reaches cracking load, the stress redistribution coefficient of hybrid C/G fiber cloth changes little and is equal to 1.3at cracking load.Then it increases gradually, is equal to 4.1at yielding load and is equal to 14.8at ultimate loads.When the beam is strengthened with common hybrid C/G fiber cloth, the high-strength property of fiber cloth cannot be fully used, and the utility degree is about 83%.When the beam is strengthened with prestressed hybrid C/G fiber cloth, the structural system of beam be improved, the high-strength property of fiber cloth can be well used, and the utility degree exceeds to 90%. -
图 2 C/G纤维布加固RC梁的非线性层壳组合单元
Figure 2. Nonlinear layer shell combined element of RC beam strengthened with C/G fiber cloth
图 12 受拉区纵筋应力曲线
Figure 12. Stress curves of longitudinal reinforcement in tensile region
图 14 预应力混杂C/G纤维布应力重分布系数
Figure 14. Stress redistribution coefficients of prestressed hybrid C/G cloth
表 2 预应力混杂C/G纤维布的应力重分布系数计算值
Table 2. Computation Values of stress redistribution coefficient of prestressed hybrid C/G cloth
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[1] 卢亦焱, 胡玲, 梁鸿骏, 等. CFRP布与钢板复合加固的钢筋混凝土梁受弯疲劳性能试验研究[J]. 建筑结构学报, 2015, 36 (11): 64-71. https://www.cnki.com.cn/Article/CJFDTOTAL-JZJB201511010.htmLU Yi-yan, HU Ling, LIANG Hong-jun, et al. Experimental research on flexural fatigue behavior of RC beams strengthened with combination of CFRP and steel plates[J]. Journal of Building Structures, 2015, 36 (11): 64-71. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-JZJB201511010.htm [2] 江胜华, 侯建国, 何英明. 考虑预应力损失的CFRP布加固钢筋混凝土梁正常使用极限状态可靠度研究[J]. 土木工程学报, 2015, 48 (11): 36-43. https://www.cnki.com.cn/Article/CJFDTOTAL-TMGC201511006.htmJIANG Sheng-hua, HOU Jiang-guo, HE Ying-ming. Reliability research of serviceability limit states for RC beams strengthened with prestressed CFRP sheets considering prestress loss[J]. China Civil Engineering Journal, 2015, 48 (11): 36-43. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-TMGC201511006.htm [3] 刘小燕, 颜东煌, 张峰, 等. 预应力高强混凝土梁极限承载力分析[J]. 中国公路学报, 2006, 19 (1): 58-61. https://www.cnki.com.cn/Article/CJFDTOTAL-ZGGL200601011.htmLIU Xiao-yan, YAN Dong-huang, ZHANG Feng, et al. Ultimate load analysis of prestressed high strength concrete beam[J]. China Journal of Highway and Transport, 2006, 19 (1): 58-61. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-ZGGL200601011.htm [4] AL-HAMMOUD R, SOUDKI K, TOPPER T H. Fatigue flexural behavior of corroded reinforced concrete beams repaired with CFRP sheets[J]. Journal of Composites for Construction, 2011, 15 (1): 42-51. doi: 10.1061/(ASCE)CC.1943-5614.0000144 [5] KURTZ S, BALAGURU P, HELM J. Experimental study of interfacial shear stresses in FRP-strengthened RC beams[J]. Journal of Composites for Construction, 2008, 12 (3): 312-322. doi: 10.1061/(ASCE)1090-0268(2008)12:3(312) [6] 薛伟辰, 郑乔文, 杨雨. 纤维塑料筋混凝土梁挠度的计算方法[J]. 水利学报, 2008, 39 (7): 883-888, 894. https://www.cnki.com.cn/Article/CJFDTOTAL-SLXB200807017.htmXUE Wei-chen, ZHENG Qiao-wen, YANG Yu. Calculation method for deflection of concrete beams reinforced with FRP rebars[J]. Journal of Hydraulic Engineering, 2008, 39 (7): 883-888, 894. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-SLXB200807017.htm [7] FRAGIACOMO M, AMADIO C, MACORINI L, et al. Finite-element model for collapse and long-term analysis of steel-concrete composite beams[J]. Journal of Structural Engineering, 2004, 130 (3): 489-497. doi: 10.1061/(ASCE)0733-9445(2004)130:3(489) [8] DENG Lin-zhong, GHOSN M, ZNIDARIC A, et al. Nonlinear flexural behavior of prestressed concrete girder bridges[J]. Journal of Bridge Engineering, 2001, 6 (4): 276-284. doi: 10.1061/(ASCE)1084-0702(2001)6:4(276) [9] SEBASTION W M, MECONNEL R E. Nonlinear FE analysis of steel-concrete composite structures[J]. Journal of Structural Engineering, 2000, 126 (6): 662-674. doi: 10.1061/(ASCE)0733-9445(2000)126:6(662) [10] CHUNG W, SOTELINO E D. Nonlinear finite-element analysis of composite steel girder bridges[J]. Journal of Structural Engineering, 2005, 131 (2): 304-313. doi: 10.1061/(ASCE)0733-9445(2005)131:2(304) [11] LEE W T, CHIOU Y J, SHIH M H. Reinforced concrete beam-column joint strengthened with carbon fiber reinforced polymer[J]. Composite Structures, 2010, 92 (1): 48-60. doi: 10.1016/j.compstruct.2009.06.011 [12] 叶见曙, 张剑, 黄剑峰. 预应力混凝土多T梁桥的极限承载力[J]. 东南大学学报: 自然科学版, 2009, 39 (1): 106-111. https://www.cnki.com.cn/Article/CJFDTOTAL-DNDX200901021.htmYE Jian-shu, ZHANG Jian, HUANG Jian-feng. Analysis of ultimate loads of prestressed concrete multi-T girder bridge[J]. Journal of Southeast University: Natural Science Edition, 2009, 39 (1): 106-111. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-DNDX200901021.htm [13] 张剑, 叶见曙, 张峰, 等. 基于混合壳单元法预应力混凝土T梁的受力性能[J]. 交通运输工程学报, 2007, 7 (4): 79-83. http://transport.chd.edu.cn/article/id/200704017ZHANG Jian, YE Jian-shu, ZHANG Feng, et al. Mechanical behavior of prestressed concrete T beam based on mixed shell element method[J]. Journal of Traffic and Transportation Engineering, 2007, 7 (4): 79-83. (in Chinese). http://transport.chd.edu.cn/article/id/200704017 [14] SEZEN H. Repair and strengthening of reinforced concrete beamcolumn joints with fiber-reinforced polymer composites[J]. Journal of Composites for Construction, 2012, 16 (5): 499-506. [15] 邓宗才, 李建辉. 混杂纤维布加固钢筋混凝土梁抗弯性能试验及理论研究[J]. 工程力学, 2009, 26 (2): 115-123, 130. https://www.cnki.com.cn/Article/CJFDTOTAL-GCLX200902023.htmDENG Zong-cai, LI Jian-hui. Experimental and theoretical research on flexural performance of RC beams strengthened with hybrid fiber sheet[J]. Engineering Mechanics, 2009, 26 (2): 115-123, 130. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-GCLX200902023.htm [16] 王东, 艾军, 王军, 等. 预应力混杂CFRP/GFRP纤维布在混凝土桥梁加固中的关键技术研究[R]. 南京: 南京航空航天大学, 2013.WANG Dong, AI Jun, WANG Jun, et al. The key technical research in concrete bridge consolidation with prestressed hybrid CFRP/GFRP sheet[R]. Nanjing: Nanjing University of Aeronautics and Astronautics, 2013. (in Chinese). [17] SHEN De-jian, DENG Shu-cheng, ZHANG Jin-yang, et al. Behavior of reinforced concrete box beam with initial cracks repaired with basalt fiber-reinforced polymer sheet[J]. Journal of Reinforced Plastics and Composites, 2015, 34 (18): 1540-1554. [18] 张峰. 预应力混凝土连续箱梁开裂后的结构行为研究[D]. 南京: 东南大学, 2007.ZHANG Feng. Research of structural behavior of PC continuous box girders[D]. Nanjing: Southeast University, 2007. (in Chinese). [19] MARI A R, OLLER E, BAIRAN J M, et al. Simplified method for the calculation of long-term deflections in FRPstrengthened reinforced concrete beams[J]. Composites Part B: Engineering, 2013, 45 (1): 1368-1376. [20] RAFI M M, NADJAI A. A suggested model for European code to calculate deflection of FRP reinforced concrete beams[J]. Magazine of Concrete Research, 2011, 63 (3): 197-214. [21] MIAS C, TORRES L, TURON A, et al. Effect of material properties on long-term deflections of GFRP reinforced concrete beams[J]. Construction and Building Materials, 2013, 41 (2): 99-108. [22] MIAS C, TORRES L, TURON A, et al. Experimental study of immediate and time-dependent deflections of GFRP reinforced concrete beams[J]. Composite Structures, 2013, 96 (4): 279-285. [23] KARA I F, DUNDAR C. Prediction of deflection of high strength steel fiber reinforced concrete beamsand columns[J]. Computers and Concrete, 2012, 9 (2): 133-151. [24] MOHAMED H M, MASMOUDI R. Deflection prediction of steel and FRP-reinforced concrete-filled FRP tube beams[J]. Journal of Composites for Construction, 2011, 15 (3): 462-472. [25] MARI A R, OLLER E, BAIRAN J M. Predicting the response of FRP-strengthened reinforced-concrete flexural members with nonlinear evolutive analysis models[J]. Journal of Composites for Construction, 2011, 15 (5): 799-809. [26] OUYANG Li-jun, LU Zhou-dao, CHEN Wei-zhen. Flexural experimental study on continuous reinforced concrete beams strengthened with basalt fiber reinforced polymer/plastic[J]. Journal of Shanghai Jiaotong University: Science, 2012, 17 (5): 613-618. [27] 李世秋, 汪厚植, 胡新民. 桥梁预应力钢筋混凝土结构耐久性影响因素及对策[J]. 筑路机械与施工机械化, 2007, 24 (6): 41-43, 52. https://www.cnki.com.cn/Article/CJFDTOTAL-ZLJX200706021.htmLI Shi-qiu, WANG Hou-zhi, HU Xin-min. Influencing factors on durability and counter measure of bridge prestressed concrete structure[J]. Road Machinery and Construction Mechanization, 2007, 24 (6): 41-43, 52. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-ZLJX200706021.htm [28] 王丹, 郭志昆, 邵飞, 等. 混杂纤维布加固轻骨料混凝土梁的试验研究[J]. 长安大学学报: 自然科学版, 2016, 36 (2): 52-58. https://www.cnki.com.cn/Article/CJFDTOTAL-XAGL201602008.htmWANG Dan, GUO Zhi-kun, SHAO Fei, et al. Experimental study on LC beams strengthened with hybrid fiber sheets[J]. Journal of Chang'an University: Natural Science Edition, 2016, 36 (2): 52-58. (in Chinese. https://www.cnki.com.cn/Article/CJFDTOTAL-XAGL201602008.htm -
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