塑性铰区碳纤维约束空心薄壁墩抗震性能分析
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摘要
对5根长细比为8的碳纤维约束墩及2根未约束的对比墩进行了拟静力试验,考察了碳纤维包裹量、配箍率2个参数对碳纤维布约束空心薄壁墩破坏机理及抗震性能的影响规律.试验结果表明:所有墩的破坏形态均表现为弯曲破坏模式;空心薄壁墩在塑性铰区域采用碳纤维约束后的承载能力和延性得到较大提高;对于配箍率为0.85%的约束墩,其抗震性能提高较明显;碳纤维具有与箍筋相似的力学性能,可以有效地改善空心薄壁墩的抗震性能,提高延性和耗能能力;结构抗震加固设计时须考虑碳纤维布最佳包裹量.
Five hollow thin-walled piers confined with CFRP(carbon fiber reinforced polymer) and two normal piers were designed and tested under axial load and cyclic lateral force.The length-diameter ratio of all piers is 8.The influence of two parameters,including axial compression ratio and pattern of CFRP wrapping,on the ductile and ability of energy dissipation of piers are taken into account.The main failure patterns as well as performance of piers are analyzed.Test results indicate that flexural failures are the main patterns of all piers.Wrapping CFRP at plastic hinge zone of piers can observably improve its ductility,energy dissipation and seismic performance.With the increase of layers of CFRP,ductility improved.CFRP,which have the same mechanical properties as stirrups,can effectively improve the seismic performance of hollow thin-walled pier except ultimate bearing capacity,included ductility and energy dissipation capacity.The optimal reinforcement rate of CFRP relates to structural design parameters.Thereby these test properties above will provide qualitative understanding for researching seismic performance evaluation and retrofit of hollow thin-walled piers.
Five hollow thin-walled piers confined with CFRP(carbon fiber reinforced polymer) and two normal piers were designed and tested under axial load and cyclic lateral force.The length-diameter ratio of all piers is 8.The influence of two parameters,including axial compression ratio and pattern of CFRP wrapping,on the ductile and ability of energy dissipation of piers are taken into account.The main failure patterns as well as performance of piers are analyzed.Test results indicate that flexural failures are the main patterns of all piers.Wrapping CFRP at plastic hinge zone of piers can observably improve its ductility,energy dissipation and seismic performance.With the increase of layers of CFRP,ductility improved.CFRP,which have the same mechanical properties as stirrups,can effectively improve the seismic performance of hollow thin-walled pier except ultimate bearing capacity,included ductility and energy dissipation capacity.The optimal reinforcement rate of CFRP relates to structural design parameters.Thereby these test properties above will provide qualitative understanding for researching seismic performance evaluation and retrofit of hollow thin-walled piers.
引文
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[2]李睿,叶燎原,周亦唐.山区空心薄壁高墩的构造与力学分析[J].公路,2007(11):46-50.
[3]陈志军,康文静,李黎.空心薄壁墩水化热温度效应研究[J].华中科技大学学报:自然科学版,2007,35(5):105-108.
[4]何义斌.混凝土空心高墩温度效应研究[J].铁道科学与工程学报,2007,4(2):63-66.
[5]何海.混凝土连续梁桥空心墩墩顶局部应力分析[J].公路交通科技,2004,21(7):88-90.
[6]彭友松,强士中,李松.圆形空心墩日照温度效应分析[J].桥梁建设,2006(4):74-77.
[7]弓俊青,朱日希.空心圆端少筋混凝土墩柱延性的分析研究[J].工程力学,2000(增刊):589-593.
[8]郝文秀,阎贵平,钟铁毅,等.反复荷载作用下活性粉末混凝土空心桥墩力学性能的试验研究[J].铁道学报,2009,31(5):60-64.
[9]梁智土土土,李建中.桥梁高墩合理计算模型探讨[J].地震工程与工程振动,2008,27(2):91-98.
[10]中华人民共和国交通部.JTG/T B02—01—2008.公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.
[11]陈惠发,段炼.桥梁工程抗震设计[M].北京:机械工业出版社,2008.
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