低周荷载下FRP约束RC矩形空心墩的抗震性能试验研究
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摘要
为了评价FRP约束RC空心墩的抗震性能,设计并制作了5个未约束和FRP约束矩形空心墩,并进行了恒轴压、水平单向低周反复荷载下的拟静力试验。通过对比分析了不同试验墩的滞回曲线、水平力和延性、总耗能和耗散系数。结果表明:FRP约束矩形空心墩的塑性铰区,可提高其抗侧刚度、改善其耗能能力和延性、提高其变形能力,且空心墩的抗震滞回耗能能力较稳定,但是,对水平力的影响较小。此外,耗散系数与总耗能的变化趋势不同,因此,评价RC空心墩耗能能力时,应综合考虑总耗能和耗散系数。
In order to estimate the anti-seismic performance of FRP-confined RC bridge pier with hollow section,five unconfined and confined bridge piers with rectangular hollow section were designed and established.And then quasi-static experiment was carried out under constant axial compression and unidirectional horizontal reversal load.Comparing hysteretic curves,lateral force and ductility as well as energy dissipation of different specimen piers,it is shown that through confining plastic hinge region of the tested bridge pier by FRP,lateral rigidity and ultimate displacement are increased;energy dissipation and ductility are improved.However,it has more considerable effective ductility than load capacity.Besides,variation trend of dissipation coefficient is different with total energy dissipation.Therefore,dissipation energy coefficient and total energy dissipation should be considered at the same time to estimate energy dissipation ability of RC hollow section bridge pier.
In order to estimate the anti-seismic performance of FRP-confined RC bridge pier with hollow section,five unconfined and confined bridge piers with rectangular hollow section were designed and established.And then quasi-static experiment was carried out under constant axial compression and unidirectional horizontal reversal load.Comparing hysteretic curves,lateral force and ductility as well as energy dissipation of different specimen piers,it is shown that through confining plastic hinge region of the tested bridge pier by FRP,lateral rigidity and ultimate displacement are increased;energy dissipation and ductility are improved.However,it has more considerable effective ductility than load capacity.Besides,variation trend of dissipation coefficient is different with total energy dissipation.Therefore,dissipation energy coefficient and total energy dissipation should be considered at the same time to estimate energy dissipation ability of RC hollow section bridge pier.
引文
[1]Han Qiang,Du Xiuli,Liu Jinbo.The seismic damage of highwaybridges during 2008 Wenchuan earthquake[J].Earthquake Engi-neering and Engineering Vibration,2009,8(2):263-273.
[2]林均岐,陈永盛,王杰.汶川8.0级地震绵竹市桥梁震害分析[J].世界地震工程,2010,26(1):80-85.Lin Junqi,Chen Yongsheng,Wang Jie.Analysis of seismic damageto highway bridges in Mianzhu City during Wenchuan Ms8.0 earth-quake[J].World Earthquake Engineering,2010,26(1):80-85.
[3]Aidool J,Harries K A,Petrou M F.Full-scale experimental inves-tigation of repair of reinforced concrete interstate bridge using CFRPmaterials[J].Journal of Bridge Engineering,2006,11(3):350-358.
[4]Haroun M A,Elsanadedy H M.Behavior of cyclically loaded squatreinforced concrete bridge columns upgraded with advanced com-posite-material jackets[J].Journal of Bridge Engineering;2005,10(6):741-748.
[5]Chansawat K,Yim S C S,Miller T H.Nonlinear finite element a-nalysis of a FRP-strengthened reinforced concrete bridge[J].Jour-nal of Bridge Engineering,2006,11(1):21-32.
[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 be-havior of FRP confined concrete columns[J].Earthquake Engi-neering 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 Guangxing.The seismic behavior of concrete col-umns confined with CFRP[J].Journal of Material Engineering,2007(2):54-57.
[8]Pantelides C P,Gergely J,Reaveley L D.Retrofit of RC bridgepier with CFRP advanced composites[J].Journal of StructuralEngineering,1999,125(10):1094-1099.
[9]Haroun M A,Elsanadedy H M.Behavior of cyclically loaded squatreinforced concrete bridge columns upgraded with advanced com-posite-material facets[J].Journal of Bridge Engineering;2005,10(6):741-748.
[2]林均岐,陈永盛,王杰.汶川8.0级地震绵竹市桥梁震害分析[J].世界地震工程,2010,26(1):80-85.Lin Junqi,Chen Yongsheng,Wang Jie.Analysis of seismic damageto highway bridges in Mianzhu City during Wenchuan Ms8.0 earth-quake[J].World Earthquake Engineering,2010,26(1):80-85.
[3]Aidool J,Harries K A,Petrou M F.Full-scale experimental inves-tigation of repair of reinforced concrete interstate bridge using CFRPmaterials[J].Journal of Bridge Engineering,2006,11(3):350-358.
[4]Haroun M A,Elsanadedy H M.Behavior of cyclically loaded squatreinforced concrete bridge columns upgraded with advanced com-posite-material jackets[J].Journal of Bridge Engineering;2005,10(6):741-748.
[5]Chansawat K,Yim S C S,Miller T H.Nonlinear finite element a-nalysis of a FRP-strengthened reinforced concrete bridge[J].Jour-nal of Bridge Engineering,2006,11(1):21-32.
[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 be-havior of FRP confined concrete columns[J].Earthquake Engi-neering 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 Guangxing.The seismic behavior of concrete col-umns confined with CFRP[J].Journal of Material Engineering,2007(2):54-57.
[8]Pantelides C P,Gergely J,Reaveley L D.Retrofit of RC bridgepier with CFRP advanced composites[J].Journal of StructuralEngineering,1999,125(10):1094-1099.
[9]Haroun M A,Elsanadedy H M.Behavior of cyclically loaded squatreinforced concrete bridge columns upgraded with advanced com-posite-material facets[J].Journal of Bridge Engineering;2005,10(6):741-748.
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