普通钢筋和碳纤维筋对预制节段桥墩抗震性能的影响(英文)
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摘要
为了得到快速施工和利用新材料的预制节段桥墩设计方法,研究了部分钢筋替换为碳纤维筋时预制节段桥墩的水平承载力和破坏等级.首先通过与拟静力试验结果的比较证明了仿真分析的正确性,然后研究了部分普通钢筋替换为碳纤维筋,对拟静力循环荷载和地震地面运动分别作用时预制节段桥墩响应的影响.结果表明:碳纤维筋能提高桥墩水平承载力,增大有效刚度,降低等效粘滞阻尼比和滞回能量耗散.地震时程计算表明:部分普通钢筋替换为碳纤维筋时,使得预制节段桥墩在较强烈地震底面运动下不倒塌.利用绝对能量法分析了桥墩在地震地面运动下的能量吸收和耗散情况,并主要研究了4种桥墩试件在3种不同地震地面运动作用下的输入能量和滞回能量耗散,结果是随着桥墩输入地震能量的增大滞回能量耗散增长缓慢.
A new design method aiming at improving construction efficiency and incorporating new materials is proposed,in which the effect of substituting partial ED bars with carbon fiber bars in precast segmental bridge piers on the lateral strength and damage level is investigated.The simulation is first taken to validate the proposed method by comparing with the pseudo static test results.Then study is focused on the effect of substituting partial ED bars with carbon fibre reinforced bars on the response of piers under the loading of pseudo static cyclic load and seismic ground motion.The results show that adding carbon fiber reinforcement bars can enhance the lateral strength of column,and increase the effective stiffness,as well as decrease the equivalent viscous damping ratio and hysteretic energy dissipation.It is found that carbon fibre reinforcement bars help keep the column survival under the ground motion with high intensity.The discussion is made on the column response under ground motion using an absolute energy method.The input energy and hysteretic energy absorbed in the four specimens under the three ground motion are also analyzed,which leads to the conclusion that,the increase of input energy is inversely proportional to the increase of the hysteretic energy of columns.
A new design method aiming at improving construction efficiency and incorporating new materials is proposed,in which the effect of substituting partial ED bars with carbon fiber bars in precast segmental bridge piers on the lateral strength and damage level is investigated.The simulation is first taken to validate the proposed method by comparing with the pseudo static test results.Then study is focused on the effect of substituting partial ED bars with carbon fibre reinforced bars on the response of piers under the loading of pseudo static cyclic load and seismic ground motion.The results show that adding carbon fiber reinforcement bars can enhance the lateral strength of column,and increase the effective stiffness,as well as decrease the equivalent viscous damping ratio and hysteretic energy dissipation.It is found that carbon fibre reinforcement bars help keep the column survival under the ground motion with high intensity.The discussion is made on the column response under ground motion using an absolute energy method.The input energy and hysteretic energy absorbed in the four specimens under the three ground motion are also analyzed,which leads to the conclusion that,the increase of input energy is inversely proportional to the increase of the hysteretic energy of columns.
引文
[1]Hewes J T,Priestley M J N.Seismic design and perfor-mance of precast concrete segmental bridge columns[R].Rep No.SSRP-2001/25,Univ of California,San Diego,2002.
[2]王志强,葛继平,魏红一.东海大桥预应力混凝土桥墩抗震性能分析[J].同济大学学报:自然科学版,2008,36(11):1462-1466.
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[6]Hieber D G,Wacker J M,Eberhard M O,et al.Precast concrete pier systems for rapid construction of bridges in seismic regions[R].Contract T2695,Task53,Department of Civil and Environmental Engineering,University of Washington,Seattle,2005.
[7]Chou Chungche,Hsu Chihpo.Hysteretic model develop-ment and seismic response of unbonded post-tensioned precast CFT segmental bridge columns[J].Earthquake Engineering and Structural Dynamics,2008,37:919-934.
[8]Ou Yuchen,Tsai Musen,Chang Kuochun,et al.Cyclic behavior of precast segmental concrete bridge columns with high performance or conventional steel reinforcing bars as energy dissipation bars[J].Earthquake Engineer-ing and Structural Dynamics,2010,39(11):1181-1198.
[9]Zhu Zhenyu,Ahmad I,Mirmiran A.Fiber element modeling for seismic performance of bridge columns made of concrete-filled FRP tubes[J].Engineering Structures,2006,28:2023-2035.
[10]Fahmy M F M,Wu Zhishen,Wu Gang,et al.Post-yield stiffnesses and residual deformations of RC bridge columns reinforced with ordinary rebars and steel fiber composite bars[J].Engineering Structures,2010,32(9):2969-2983.
[11]谢旭,布占宇.应用碳纤维筋控制桥墩地震损伤方法初探[J].浙江大学学报:工学版,2005,39(10):1589-1595.
[12]Bank L C.Composites for construction:Structural design with FRP materials[M].New York:John Wiley&Sons,2006.
[13]Park R,Kent D C,Sampton R A.Reinforced concrete members with cyclic loading[J].Journal of the Structural Division,1972,98(7):1341-1360.
[14]Scott B D,Park R,Priestley M J N.Stress-strain behavior of concrete confined by overlapping hoops at low and high strain rates[J].ACI Journal,1982,79(1):13-27.
[15]Menegotto M,Pinto P E.Method of analysis of cyclically loaded R.C.plane frames including changes in geometry and non-elastic behavior of elements under combined normal force and bending[M]//Proceedings of the IABSE Symposium on the Resistance and Ultimate Deform-ability of Structures Acted on by Well-Defined Repeated Loads,1973:15-22.
[16]Spacone E,Filippou F C,Taucer F F.Fibre beam-column model for non-linear analysis of R/C frames:Part I.Formulation[J].Earthquake Engineering and Structural Dynamics,1996,25:711-725.
[17]Uang C M,Bertero V V.Evaluation of seismic energy in structures[J].Earthquake Engineering and Structural Dynamics,1990,19:77-90.
[2]王志强,葛继平,魏红一.东海大桥预应力混凝土桥墩抗震性能分析[J].同济大学学报:自然科学版,2008,36(11):1462-1466.
[3]Billington S L,Barnes R W,Breen J E.A precast segmental substructure system for standard bridges[J].PCI Journal,1999,44(4):56-73.
[4]Ou Yuchen,Wang Pinghsiung,Tsai Musen,et al.Large-scale experimental study of precast segmental unbonded posttensioned concrete bridge columns for seismic regions[J].Journal of Structural Engineering,ASCE,2010,136(3):255-264.
[5]Shim C S,Chung C H,Kim H H.Experimental evaluation of seismic performance of precast segmental bridge piers with a circular solid section[J].Engineering Structures,2008,30:3782-3792.
[6]Hieber D G,Wacker J M,Eberhard M O,et al.Precast concrete pier systems for rapid construction of bridges in seismic regions[R].Contract T2695,Task53,Department of Civil and Environmental Engineering,University of Washington,Seattle,2005.
[7]Chou Chungche,Hsu Chihpo.Hysteretic model develop-ment and seismic response of unbonded post-tensioned precast CFT segmental bridge columns[J].Earthquake Engineering and Structural Dynamics,2008,37:919-934.
[8]Ou Yuchen,Tsai Musen,Chang Kuochun,et al.Cyclic behavior of precast segmental concrete bridge columns with high performance or conventional steel reinforcing bars as energy dissipation bars[J].Earthquake Engineer-ing and Structural Dynamics,2010,39(11):1181-1198.
[9]Zhu Zhenyu,Ahmad I,Mirmiran A.Fiber element modeling for seismic performance of bridge columns made of concrete-filled FRP tubes[J].Engineering Structures,2006,28:2023-2035.
[10]Fahmy M F M,Wu Zhishen,Wu Gang,et al.Post-yield stiffnesses and residual deformations of RC bridge columns reinforced with ordinary rebars and steel fiber composite bars[J].Engineering Structures,2010,32(9):2969-2983.
[11]谢旭,布占宇.应用碳纤维筋控制桥墩地震损伤方法初探[J].浙江大学学报:工学版,2005,39(10):1589-1595.
[12]Bank L C.Composites for construction:Structural design with FRP materials[M].New York:John Wiley&Sons,2006.
[13]Park R,Kent D C,Sampton R A.Reinforced concrete members with cyclic loading[J].Journal of the Structural Division,1972,98(7):1341-1360.
[14]Scott B D,Park R,Priestley M J N.Stress-strain behavior of concrete confined by overlapping hoops at low and high strain rates[J].ACI Journal,1982,79(1):13-27.
[15]Menegotto M,Pinto P E.Method of analysis of cyclically loaded R.C.plane frames including changes in geometry and non-elastic behavior of elements under combined normal force and bending[M]//Proceedings of the IABSE Symposium on the Resistance and Ultimate Deform-ability of Structures Acted on by Well-Defined Repeated Loads,1973:15-22.
[16]Spacone E,Filippou F C,Taucer F F.Fibre beam-column model for non-linear analysis of R/C frames:Part I.Formulation[J].Earthquake Engineering and Structural Dynamics,1996,25:711-725.
[17]Uang C M,Bertero V V.Evaluation of seismic energy in structures[J].Earthquake Engineering and Structural Dynamics,1990,19:77-90.
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