限制位移桥墩的连续刚构桥抗震性能研究
|
摘要
沿着摇摆桥墩的概念提出一种限制位移桥墩连续刚构桥体系。该体系通过对连续刚构桥墩底和承台之间采取一定措施,使桥梁在地震发生时能够在限制的位移量内活动,减小输入到桥梁结构中的能量,达到减震的目的。通过对一座铁路连续刚构桥的分析,发现这种限制位移桥墩连续刚构桥体系能大幅减小桥墩的延性和强度地震需求,减震效果明显,在选择合适的限制位移量的情况下,可保证桥墩在高烈度罕遇地震作用下几乎保持弹性工作状态,震后经简单处理即可保证使用功能,为震后救援工作带来极大便利,也大大减少了修复成本。
Since the beginning of the 1990 s,performance-based seismic design theory has entered the mainstream of structural seismic research.The purpose of performance-based seismic design theory is to determine the seismic performance objectives of a building based on its use,importance,and level of seismic fortification.Buildings designed in accordance with those objectives will safely withstand earthquakes that may occur in the future.On the bridge,plastic hinges placed on the piers were used to consume earthquake energy.Design for ductility can avoid collapse of the bridge.However,permanent deformation of the plastic hinges could cause serious damage to the pier.It is difficult to immediately repair bridges following earthquakes.Many transportation functions are significantly slowed or lost.In order to ensure that the transportation capacity of bridges is recovered quickly after a strong earthquake,many structural systems have been proposed,including rocking bridge piers and self-centering bridge piers.The continuous rigid frame bridge system with displacement-restricted piers was consistent with the concept of rocking piers.This structure can realize three important functions:(1)limit the maximum displacement of pier,(2)prevent the bridge from overturning,and(3)adjust the coefficient of friction at the pier bottom.By adhering to these objectives between the pier bottom and the pier cap,the displacement-restricted system allowed the bridge to move with under the action of the earthquake.In so doing,this method can reduce the input of energy to the bridge structure and achieve the purpose ofearthquake mitigation.This study concluded that the continuous rigid frame bridge system with displacementrestricted piers could reduce ductility and strength demands on the bridge piers.This paper compared the displacement limits of 2cm,5cm,8cm and traditional piers.The results showed that the displacement of the pier top,the bending moment at the pier bottom,and the bending moment of the pier at the bridge beam with the displacement-restricted 2cm,5cm,8cm piers were much less than the piers of a traditional continuous rigid frame bridge.The results also show that the amount of displacement restrictions is important.Choosing the appropriate displacement restriction can ensure that the elastic working state of the bridge will be maintained under severe earthquake conditions.This can improve the effectiveness of earthquake relief work and greatly reduce the cost of repairs.
Since the beginning of the 1990 s,performance-based seismic design theory has entered the mainstream of structural seismic research.The purpose of performance-based seismic design theory is to determine the seismic performance objectives of a building based on its use,importance,and level of seismic fortification.Buildings designed in accordance with those objectives will safely withstand earthquakes that may occur in the future.On the bridge,plastic hinges placed on the piers were used to consume earthquake energy.Design for ductility can avoid collapse of the bridge.However,permanent deformation of the plastic hinges could cause serious damage to the pier.It is difficult to immediately repair bridges following earthquakes.Many transportation functions are significantly slowed or lost.In order to ensure that the transportation capacity of bridges is recovered quickly after a strong earthquake,many structural systems have been proposed,including rocking bridge piers and self-centering bridge piers.The continuous rigid frame bridge system with displacement-restricted piers was consistent with the concept of rocking piers.This structure can realize three important functions:(1)limit the maximum displacement of pier,(2)prevent the bridge from overturning,and(3)adjust the coefficient of friction at the pier bottom.By adhering to these objectives between the pier bottom and the pier cap,the displacement-restricted system allowed the bridge to move with under the action of the earthquake.In so doing,this method can reduce the input of energy to the bridge structure and achieve the purpose ofearthquake mitigation.This study concluded that the continuous rigid frame bridge system with displacementrestricted piers could reduce ductility and strength demands on the bridge piers.This paper compared the displacement limits of 2cm,5cm,8cm and traditional piers.The results showed that the displacement of the pier top,the bending moment at the pier bottom,and the bending moment of the pier at the bridge beam with the displacement-restricted 2cm,5cm,8cm piers were much less than the piers of a traditional continuous rigid frame bridge.The results also show that the amount of displacement restrictions is important.Choosing the appropriate displacement restriction can ensure that the elastic working state of the bridge will be maintained under severe earthquake conditions.This can improve the effectiveness of earthquake relief work and greatly reduce the cost of repairs.
引文
[1]周颖,吕西林.摇摆结构及自复位结构研究综述[J].建筑结构学报,2011,32(9):1-10.ZHOU Ying,LU Xi-lin.State-of-the-art on Rocking and Selfcentering Structures[J].Journal of Building Structures,2011,32(9):1-10.(in Chinese)
[2]卢皓,李建中.强震作用下高墩桥梁抗震性能特点分析[J].地震工程学报,2013,35(4):858-865.LU Hao,LI Jian-zhong.Analysis of Seismic Performance Characteristics of Bridge with High piers Under Strong Earthquake Motion[J].China Earthquake Engineering Journal,2013,35(4):858-865.(in Chinese)
[3]Housner G W.The Behavior of Inverted Pendulum Structures During Earthquakes[J].Bulletin of the Seismological Society of America,1963,53(2):403-417.
[4]Mander J B,Cheng C T.Seismic Resistance of Bridge Piers Based on Damage Avoidance Based on Damage Avoidance Design[R].Technical Report Nceer,97-0014,Buffalo,NY:NCREE,1997.
[5]Cheng C T.New Paradigms for the Seismic Design and Retrofit of the Bridge Piers[D].Buffalo:State University of New Yorkk at Buffalo,1997.
[6]Hao H,Daube M.Numerical Study of Rocking Pier in Mitigating Bridge Responses to Earthquake Ground Motions[C]//Tweed Heads,Gold Coast:Australian Earthquake Engineering Society 2012Conference.2012.
[7]Lee W K,Billington S L.Performance-based Earthquake Engineering Assessment of a Self-centering,Post-tensioned Concrete Bridge System[J].Earthquake Engng Struct Dyn,2011,40:887-902.
[8]Palermo A,Pampanin S,Calvi G M.Use of“Controlled Rocking”in the Seismic Design of Bridges[C]//Vancouver,B C,Canada:13th World Conference on Earthquake Engineering.2004.
[9]Solbrg,K M,Mashiko N,Mander J B,et al.Performance of a Damage Protected Highway Bridge Pier Subjected to Bidirectional Earthquake Attack[J].Journal of Structural Engineering,2009,135(5):469-478.
[10]Marriott D,Palermo A,Pampanin S.Quasi-static and Pseudodynamic Testing of Damage Resistant Bridge Piers with Hybrid Connectionss[A]//Proceedings of First European Conference on Earthquake Engineering and Seismology.Geneva,Switzerland,2006.
[11]Palermo A,Pampanin S,Marriott D.Design,Modeling,and Experimental Response of Seismic Resistant Bridge Piers with Posttensioned Dissipating Connections[J].Journal of Structural Engineering,2007,133(11):1648-1661.
[12]Jeong H I,Sakai J,Mahin S A.Shaking Table Tests and Numerical Investigation of Self-centering Reinforced Concrete Bridge Columns[R].Pacific Earthquake Engineering Research Center,2008.
[13]郭佳.基于性能的新型自复位桥墩抗震理论与试验研究[D].北京:清华大学,2012.GUO Jia.Performance Based Research on the Seismic Theory and Test of New Self-centering Pier[D].Beijing:Tsinghua University,2012.(in Chinese)
[14]郭佳,辛克贵,何铭华,等.自复位桥梁墩柱结构抗震性能试验研究与分析[J].工程力学,2012,29(增刊);29-34.GUO Jia,XIN Ke-gui,HE Ming-hua,et al.Experimental Study and Analysis on the Seismic Performance of a Self-centering Bridge Pier[J].Engineering Mechanics,2012,29(S):29-34.(in Chinese)
[2]卢皓,李建中.强震作用下高墩桥梁抗震性能特点分析[J].地震工程学报,2013,35(4):858-865.LU Hao,LI Jian-zhong.Analysis of Seismic Performance Characteristics of Bridge with High piers Under Strong Earthquake Motion[J].China Earthquake Engineering Journal,2013,35(4):858-865.(in Chinese)
[3]Housner G W.The Behavior of Inverted Pendulum Structures During Earthquakes[J].Bulletin of the Seismological Society of America,1963,53(2):403-417.
[4]Mander J B,Cheng C T.Seismic Resistance of Bridge Piers Based on Damage Avoidance Based on Damage Avoidance Design[R].Technical Report Nceer,97-0014,Buffalo,NY:NCREE,1997.
[5]Cheng C T.New Paradigms for the Seismic Design and Retrofit of the Bridge Piers[D].Buffalo:State University of New Yorkk at Buffalo,1997.
[6]Hao H,Daube M.Numerical Study of Rocking Pier in Mitigating Bridge Responses to Earthquake Ground Motions[C]//Tweed Heads,Gold Coast:Australian Earthquake Engineering Society 2012Conference.2012.
[7]Lee W K,Billington S L.Performance-based Earthquake Engineering Assessment of a Self-centering,Post-tensioned Concrete Bridge System[J].Earthquake Engng Struct Dyn,2011,40:887-902.
[8]Palermo A,Pampanin S,Calvi G M.Use of“Controlled Rocking”in the Seismic Design of Bridges[C]//Vancouver,B C,Canada:13th World Conference on Earthquake Engineering.2004.
[9]Solbrg,K M,Mashiko N,Mander J B,et al.Performance of a Damage Protected Highway Bridge Pier Subjected to Bidirectional Earthquake Attack[J].Journal of Structural Engineering,2009,135(5):469-478.
[10]Marriott D,Palermo A,Pampanin S.Quasi-static and Pseudodynamic Testing of Damage Resistant Bridge Piers with Hybrid Connectionss[A]//Proceedings of First European Conference on Earthquake Engineering and Seismology.Geneva,Switzerland,2006.
[11]Palermo A,Pampanin S,Marriott D.Design,Modeling,and Experimental Response of Seismic Resistant Bridge Piers with Posttensioned Dissipating Connections[J].Journal of Structural Engineering,2007,133(11):1648-1661.
[12]Jeong H I,Sakai J,Mahin S A.Shaking Table Tests and Numerical Investigation of Self-centering Reinforced Concrete Bridge Columns[R].Pacific Earthquake Engineering Research Center,2008.
[13]郭佳.基于性能的新型自复位桥墩抗震理论与试验研究[D].北京:清华大学,2012.GUO Jia.Performance Based Research on the Seismic Theory and Test of New Self-centering Pier[D].Beijing:Tsinghua University,2012.(in Chinese)
[14]郭佳,辛克贵,何铭华,等.自复位桥梁墩柱结构抗震性能试验研究与分析[J].工程力学,2012,29(增刊);29-34.GUO Jia,XIN Ke-gui,HE Ming-hua,et al.Experimental Study and Analysis on the Seismic Performance of a Self-centering Bridge Pier[J].Engineering Mechanics,2012,29(S):29-34.(in Chinese)
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心