水平双向荷载作用下FRP约束RC矩形空心桥墩抗震性能试验
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摘要
为了研究水平双向地震作用下纤维增强复合材料(FRP)约束钢筋混凝土(RC)空心桥墩的抗震性能,对10个FRP约束RC矩形空心桥墩进行了水平双向拟静力试验。通过分析不同试验空心墩的破坏形态、抗震性能参数和FRP有效拉应变,研究了长细比、壁厚、轴压比、FRP加固参数和加固方案对其破坏形态和抗震性能的影响,基于FRP拉应变试验结果和现有FRP有效拉应变计算模型,确定了影响FRP有效拉应变的主要参数,并提出了水平双向荷载作用下约束矩形空心桥墩的FRP有效拉应变计算公式。结果表明:FRP约束空心桥墩塑性铰区,可明显改善空心墩的耗能、极限变形和延性;提出的公式计算值与试验结果吻合较好。
In order to evaluate seismic performance of fiber reinforced polymer(FRP)confined reinforced concrete(RC)bridge piers with hollow section under horizontal bidirectional earthquake action,the horizontal bidirectional quasi-static test was carried out on 10 FRP confined RC bridge piers with rectangular hollow section. The failure modes,seismic performance parameters and effective FRP tension strain of specimens were analyzed.The effects of slenderness ratio,wall thickness,axial compression ratio,FRP confining parameters and strengthening plans on failure mode and seismic performance of specimens were studied.Based on experimental results and present computation models of effective FRP tension strain,the main influencing parameters for effective FRP tension strain were determinated.And an improved FRP effective tension strain formula was presented for FRP confined bridge piers with hollow section under horizontal bidirectional earthquake action.The results show that dissipated energy,limitdeformation and ductility of confined hollow section bridge piers are improved by FRP confining within plastic hinge region;and the calculated FRP effective ultimate tension strains obtained by the new formula are well agreed with experimental results.
In order to evaluate seismic performance of fiber reinforced polymer(FRP)confined reinforced concrete(RC)bridge piers with hollow section under horizontal bidirectional earthquake action,the horizontal bidirectional quasi-static test was carried out on 10 FRP confined RC bridge piers with rectangular hollow section. The failure modes,seismic performance parameters and effective FRP tension strain of specimens were analyzed.The effects of slenderness ratio,wall thickness,axial compression ratio,FRP confining parameters and strengthening plans on failure mode and seismic performance of specimens were studied.Based on experimental results and present computation models of effective FRP tension strain,the main influencing parameters for effective FRP tension strain were determinated.And an improved FRP effective tension strain formula was presented for FRP confined bridge piers with hollow section under horizontal bidirectional earthquake action.The results show that dissipated energy,limitdeformation and ductility of confined hollow section bridge piers are improved by FRP confining within plastic hinge region;and the calculated FRP effective ultimate tension strains obtained by the new formula are well agreed with experimental results.
引文
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[13]冯鹏,陆新征,叶列平.纤维增强复合材料建设工程应用技术——试验、理论与方法[M].北京:中国建筑工业出版社,2011.FENG Peng,LU Xin-zheng,YE Lie-ping.Application of Fiber Reinforced Polymer in Construction:Experiment,Theory and Methodology[M].Beijing:China Architecture and Building Press,2011.
[14]叶列平,赵树红,李全旺,等.碳纤维布加固混凝土柱的斜截面受剪承载力计算[J].建筑结构学报,2000,21(2):59-67.YE Lie-ping,ZHAO Shu-hong,LI Quan-wang,et al.Calculation of Shear Strength of Concrete Column Strengthened with Carbon Fiber Reinforced Plastic Sheet[J].Journal of Building Structures,2000,21(2):59-67.
[2]贡金鑫,王雪婷,张勤.从汶川地震灾害看现行国内外桥梁抗震设计方法[J].大连理工大学学报,2009,49(5):739-747.GONG Jin-xin,WANG Xue-ting,ZHANG Qin.Overview on Current Bridge Seismic Design Approach in Home and Abroad Codes Based on Survey of Wenchuan Earthquake[J].Journal of Dalian University of Technology,2009,49(5):739-747.
[3]梁智垚.非规则高墩桥梁抗震设计理论研究[D].上海:同济大学,2007.LIANG Zhi-yao.Study on Seismic Design Theory of Irregular Girder Bridges with High Piers[D].Shanghai:Tongji University,2007.
[4]刘林.高墩大跨铁路桥梁抗震设计与减震控制研究[D].北京:北京交通大学,2004.LIU Lin.Investigation of Seismic Design and Seismic Response Control of High-pier-and-long-span Railway Bridges[D].Beijing:Beijing Jiaotong University,2004.
[5]JTG/T B02-01—2008,公路桥梁抗震设计细则[S].JTG/T B02-01—2008,Guidelines for Seismic Design of Highway Bridges[S].
[6]于清,陶忠,高献.FRP约束混凝土柱抗震性能若干问题的探讨[J].地震工程与工程振动,2006,26(4):75-82.YU Qing,TAO Zhong,GAO Xian.Several Problems in Seismic Behavior of FRP Confined Concrete Columns[J].Earthquake Engineering and Engineering Vibration,2006,26(4):75-82.
[7]张剑,许广兴.CFRP约束混凝土柱的抗震性能[J].材料工程,2007(2):54-57.ZHANG Jian,XU Guang-xing.The Seismic Behavior of Concrete Columns Confined with CFRP[J].Material Structural,2007(2):54-57.
[8]YEH Y K,MO Y L,YANG C Y.Seismic Performance of Rectangular Hollow Bridge Columns[J].Journal of Structural Engineering,2002,128(1):60-68.
[9]CHANSAWAT K,YIM S C S,MILLER T H.Nonlinear Finite Element Analysis of a FRP-strengthened Reinforced Concrete Bridge[J].Journal of Bridge Engineering,2006,11(1):21-32.
[10]LIU Xiao-gang,FAN Jian-sheng,NIE Jian-guo,et al.Behavior of Composite Rigid Frame Bridge Under Bidirectional Seismic Excitations[J].Journal of Traffic and Transportation Engineering:English Edition,2014,1(1):62-71.
[11]张轲,岳清瑞,叶列平,等.碳纤维布加固混凝土柱改善延性的试验研究[J].工业建筑,2000,30(2):16-19.ZHANG Ke,YUE Qing-rui,YE Lie-ping,et al.Experimental Research on Ductility Improvement of Concrete Column Strengthened with CFS[J].Industrial Construction,2000,30(2):16-19.
[12]JTJ 004—89,公路工程抗震设计规范[S].JTJ 004—89,Code for Seismic Design of Highway Engineering[S].
[13]冯鹏,陆新征,叶列平.纤维增强复合材料建设工程应用技术——试验、理论与方法[M].北京:中国建筑工业出版社,2011.FENG Peng,LU Xin-zheng,YE Lie-ping.Application of Fiber Reinforced Polymer in Construction:Experiment,Theory and Methodology[M].Beijing:China Architecture and Building Press,2011.
[14]叶列平,赵树红,李全旺,等.碳纤维布加固混凝土柱的斜截面受剪承载力计算[J].建筑结构学报,2000,21(2):59-67.YE Lie-ping,ZHAO Shu-hong,LI Quan-wang,et al.Calculation of Shear Strength of Concrete Column Strengthened with Carbon Fiber Reinforced Plastic Sheet[J].Journal of Building Structures,2000,21(2):59-67.
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