CFRP增强工程水泥基复合材料桥面连接板的结构和性能
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摘要
桥梁面板的伸缩缝连接装置是现今桥梁施工与维护的难题之一。桥面无缝连接板是将相邻的桥面板连接在桥墩上,形成桥跨间的连续板。结合碳纤维增强聚合物基复合材料(CFRP)良好的耐腐蚀性与工程水泥基复合材料(Engineered Cementitious Composites,ECC)的高延性,对CFRP材料增强ECC桥面连接板进行研究。对比了CFRP软质格栅、CFRP筋材和纯ECC桥面连接板的荷载-位移曲线、裂缝分布、应变以及变形,分析三种连接板的连接性能。试验结果表明,三种桥面连接板能满足工程变形与开裂要求。CFRP软质格栅削弱连接板材料界面,降低板多裂缝开展,对增强桥面连接板作用较小。相对其他ECC连接板构件,CFRP筋材对ECC连接板增强作用明显,其弯曲变形能力显著提高,裂缝均匀且分布广泛,整体工作性能良好。
The maintenance of the expansion joints in concrete deck slabs is one of the most serious problems in current bridge engineering.One of the alternatives is the use of link slab in a jointless bridge,which connects the adjacent bridge deck slabs at the pier,forming a continuous slab across the bridge spans.Based on the good corrosion resistance of carbon fiber reinforced polymer(CFRP)and high ductility of engineered cementitious composites(ECC),the CFRP reinforced ECC link slabs were proposed in this study and the behaviour of this novel link slab were investigated through a series of experimental test.The load-displacement response,crack distribution,strain,and deformation of CFRP soft grid,CFRP bar and ECC link slabs were compared to investigate the behaviour of the test link slabs.The experimental results show that all the ECC test link slabs can satisfy the requirements of deformation and cracking.It is found that using CFRP grid results in the damage in the interface of the link slab.Therefore,the multi-cracking behaviour of the ECC link slab is reduced,which has negative effect on the behaviour of ECC link slab.Compared with the other test link slabs,CFRP bars has a significant effect on the ECC link slab.The deformation capacity is significantly enhanced.The cracks are evenly distributed with small crack width.As a result,the global structural performance of ECC link slabs is improved.
The maintenance of the expansion joints in concrete deck slabs is one of the most serious problems in current bridge engineering.One of the alternatives is the use of link slab in a jointless bridge,which connects the adjacent bridge deck slabs at the pier,forming a continuous slab across the bridge spans.Based on the good corrosion resistance of carbon fiber reinforced polymer(CFRP)and high ductility of engineered cementitious composites(ECC),the CFRP reinforced ECC link slabs were proposed in this study and the behaviour of this novel link slab were investigated through a series of experimental test.The load-displacement response,crack distribution,strain,and deformation of CFRP soft grid,CFRP bar and ECC link slabs were compared to investigate the behaviour of the test link slabs.The experimental results show that all the ECC test link slabs can satisfy the requirements of deformation and cracking.It is found that using CFRP grid results in the damage in the interface of the link slab.Therefore,the multi-cracking behaviour of the ECC link slab is reduced,which has negative effect on the behaviour of ECC link slab.Compared with the other test link slabs,CFRP bars has a significant effect on the ECC link slab.The deformation capacity is significantly enhanced.The cracks are evenly distributed with small crack width.As a result,the global structural performance of ECC link slabs is improved.
引文
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[13]SHAHNEWAZ Md, MACHIAL Robert, ALAM M S,RTEIL Ahmad.Optimized shear design equation for slender concrete beams reinforced with FRP bars and stirrups using Genetic Algorithm and reliability analysis[J].Engineering Structures,2016,107:151-165.
[14]SABER A,ALETI A R.Behavior of FRP link slabs in jointless bridge decks[J].Advances in Civil Engineering,2014,2012(1687-8086):140-148.
[15]LEPECH M D,LI V C.Application of ECC for bridge deck link slabs[J].Materials &Structures,2009,42(9):1185-1195.
[16]Officials A A O S H.Standard specifications for highway bridges[J].1935,148(3):143-153.
[17]CANER A,ZIA P.Behavior and design of link slabs for jointless bridge decks[J].PCI Journal,1998,43(43):68-81.
[18]SOUDKI K,ALKHRDAJI T.Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures(ACI 440.2R-02)[C]//Structures Congress,2005,71(171):1-8.
[19]OKEIL A M,ELSAFTY A.Partial continuity in bridge girders with jointless decks[J].Practice Periodical on Structural Design &Construction,2005,10(4):229-238.
[20]KIM Y Y,FISCHER G,Li V C.Performance of bridge deck link slabs designed with ductile ECC[J].ACI Struct J,2004,101(6):792-801.
[21]中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会.热轧型钢:GB/T 706—2008[S].北京:中国标准出版社,2009.Jointly Issued by General Administration of Quality Supervision,Inspection and Quarantine of the People’s Republic of China,Standardization Administration of the People’s Republic of China.Hot rolled section steel:GB/T 706—2008[S].Beijing:Standards Press of China,2009(in Chinese).
[2]AKTAN H,KOYUNCU Y,RUTYNA J,AHLBRON T M,KASPER J M.Causes and cures for prestressed concrete I—Beam deterioration:Reserch report RC-1412[R].Lansing,Michigan:Michigan Department of Transportation,2002.
[3]WOLDETINSAE A M,KLINGER J E,Integral bridge design and construction:Report FHWA/MD-87/04[R].US:Maryland Department of Transportation,1987.
[4]Burke M J.Integral and semi-integral bridges[M].US:John Wiley &Sons,2009.
[5]徐世烺,李庆华.超高韧性水泥基复合材料基本性能和结构应用研究进展[J].全国结构工程学术会议论文集,2009:23-67.XU S L,LI Q H.Performance and application of ultra high toughness cementitious composite:A review[J].Proceeding of National Academic Conference on Structural Engineering,2009:23-67(in Chinese).
[6]徐世烺.超高韧性绿色ECC新型材料研究及应用[R].大连:大连理工大学,2007.XU Shiwei.Research and application of ultra-high toughness green ECC new material[R].Dalian:Dalian University of Technology,2007(in Chinese).
[7]朱忠锋,王文炜玄.武岩格栅增强水泥基复合材料单轴拉伸力学性能试验及本构关系模型[J].复合材料学报,2017,34(10):2367-2374.ZHU Zhongfeng,WANG Wenwei,Experiment on the uniaxial tensile michanical behavior of basalt grid reinforced engineered cementitious composites and its constitutive model[J].Acta Materiae Compositae Sinica,2017,34(10):2367-2374(in Chinese).
[8]徐世烺,蔡向荣.超高韧性纤维增强水泥基复合材料基本力学性能[J].水利学报,2009,40(9):1055-1063.XU Shilang,CAI Xiangrong,Experimental study on mechanical properties of ultra-high toughness fiber reinforced cementitious composite[J].Journal of Hydraulic Engineering,2009,40(9):1055-1063(in Chinese).
[9]李贺东,徐世烺.超高韧性水泥基复合材料试验研究[D].大连:大连理工大学,2008.LI Hedong,XU Shilang.Experimental research on ultra high toughness cementitious composites[D].Dalian:Dalian University of Technology,2008(in Chinese).
[10]LI V C,FISCHER G,KIM Y,et al.Durable link slabs for jointless bridge decks based on strain-hardening cementitious composites[R].US:Michigan Department of Transportation,2003.
[11]YANG E H,Li V C,Qiu J.Early age cracking in a SHCC bridge deck link slab[C]//Asce Forensic Engineering,Congress,2015.
[12]TENG J G,CHEN J F,SMITH S T,et al.FRP-strengthened RC structures[M].US:John Wiley and Sons Ltd,2002.
[13]SHAHNEWAZ Md, MACHIAL Robert, ALAM M S,RTEIL Ahmad.Optimized shear design equation for slender concrete beams reinforced with FRP bars and stirrups using Genetic Algorithm and reliability analysis[J].Engineering Structures,2016,107:151-165.
[14]SABER A,ALETI A R.Behavior of FRP link slabs in jointless bridge decks[J].Advances in Civil Engineering,2014,2012(1687-8086):140-148.
[15]LEPECH M D,LI V C.Application of ECC for bridge deck link slabs[J].Materials &Structures,2009,42(9):1185-1195.
[16]Officials A A O S H.Standard specifications for highway bridges[J].1935,148(3):143-153.
[17]CANER A,ZIA P.Behavior and design of link slabs for jointless bridge decks[J].PCI Journal,1998,43(43):68-81.
[18]SOUDKI K,ALKHRDAJI T.Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures(ACI 440.2R-02)[C]//Structures Congress,2005,71(171):1-8.
[19]OKEIL A M,ELSAFTY A.Partial continuity in bridge girders with jointless decks[J].Practice Periodical on Structural Design &Construction,2005,10(4):229-238.
[20]KIM Y Y,FISCHER G,Li V C.Performance of bridge deck link slabs designed with ductile ECC[J].ACI Struct J,2004,101(6):792-801.
[21]中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会.热轧型钢:GB/T 706—2008[S].北京:中国标准出版社,2009.Jointly Issued by General Administration of Quality Supervision,Inspection and Quarantine of the People’s Republic of China,Standardization Administration of the People’s Republic of China.Hot rolled section steel:GB/T 706—2008[S].Beijing:Standards Press of China,2009(in Chinese).