斜度对斜交桥地震作用下的扭转效应影响
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摘要
为满足交通工程中线路运行的需要,桥梁斜交有时不可避免.相对于正交桥而言,斜交桥在地震作用下有扭转破坏的趋势.斜度作为斜交桥的主要特征参量,其对斜交桥在地震作用下扭转效应的影响作用,目前研究还存在彼此不同的看法.为此,以一实际工程为原型,建立了不同斜度的桥梁分析模型,利用模态分析和非线性时程分析方法对不同斜度的斜交桥梁在地震作用下的扭转效应展开研究.通过研究发现:斜度增大,斜交桥的扭转周期与平动周期之比线性增加,结构的抗扭刚度减弱,同时桥墩在地震作用下的扭矩作用也将增大.对于上部结构平面内的扭转位移,若梁体端部与桥台之间的伸缩缝宽度足够大,梁体与桥台不发生接触碰撞,增大桥梁的斜度并不能引起上部结构的扭转位移;若梁体与桥台发生接触碰撞,斜度增大,上部结构的扭转位移增大.
To meet the requirement of traffic lines,skew bridges sometimes cannot be avoided.In comparison with orthogonal bridges,there is a tendency for torsion damage of skew bridges during earthquakes.As the main characteristic parameter for skew bridges,the skew angle may have a significant effect on torsion damage of skew bridges during earthquakes.However,this theory has not been confirmed and there are several existing opinions.In this paper,a real bridge was used as the prototype,and bridge models with different skew angles were developed.The torsion effects of the skew angle on skew bridges during earthquakes were studied using the modal analysis and nonlinear time history analysis methods.From the research,it can be found that by increasing the skew angle,the ratio for the torsion period and translation period will increase linearly,and the torsion stiffness will decrease.The torque of piers under earthquakes will also increase with the increase of the skew angle.For the torsion displacement of the superstructures,if the width of expansion joints is enough to avoid the collision between superstructures and abutments,the increase of the skew angle will not result in torsion displacement of superstructures;on the other hand,if a collision between superstructures and abutments takes place,torsional displacement of superstructures under earthquakes will increase with the increasing of the skew angle.
To meet the requirement of traffic lines,skew bridges sometimes cannot be avoided.In comparison with orthogonal bridges,there is a tendency for torsion damage of skew bridges during earthquakes.As the main characteristic parameter for skew bridges,the skew angle may have a significant effect on torsion damage of skew bridges during earthquakes.However,this theory has not been confirmed and there are several existing opinions.In this paper,a real bridge was used as the prototype,and bridge models with different skew angles were developed.The torsion effects of the skew angle on skew bridges during earthquakes were studied using the modal analysis and nonlinear time history analysis methods.From the research,it can be found that by increasing the skew angle,the ratio for the torsion period and translation period will increase linearly,and the torsion stiffness will decrease.The torque of piers under earthquakes will also increase with the increase of the skew angle.For the torsion displacement of the superstructures,if the width of expansion joints is enough to avoid the collision between superstructures and abutments,the increase of the skew angle will not result in torsion displacement of superstructures;on the other hand,if a collision between superstructures and abutments takes place,torsional displacement of superstructures under earthquakes will increase with the increasing of the skew angle.
引文
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[10]于海龙,朱晞.地震作用下简支梁桥梁间碰撞的反应性能[J].北方交通大学学报,2004,28(1):43-46.YU Hailong,ZHU Xi.Characteristic of pounding respon-seof the simple-supported bridges during earthquake[J].Journal of Northern Jiaotong University,2004,28(1):43-46.
[11]张楠,夏禾,De Roeck Guido.多点激励作用下车-桥-地震耦合系统分析[J].哈尔滨工程大学学报,2011,32(1):26-32.ZHANG Nan,XIA He,De ROECK G.Analysis of a vehi-cle-bridge-earthquake interactive system under multi-sup-port excitations[J].Journal of Harbin Engineering Univer-sity,2011,32(1):26-32.
[12]王军文,李建中,范立础.连续梁桥纵向地震碰撞反应参数研究[J].中国公路学报,2005,18(4):42-47.WANG Junwen,LI Jianzhong,FAN Lichu.Parametricstudy of longitudinal seismic pounding response for contin-uous girder bridges[J].China Journal of Highway andTransport,2005,18(4):42-47.
[2]WAKEFIELD R R,NAZMY A S,BILLINGTON D P.A-nalysis of seismic failure in skew RC bridge[J].Journal ofStructure Engineering,1991,117(3):972-986.
[3]MENG J Y,LUI E M.Seismic analysis and assessment of askew highway bridge[J].Engineering Structures,2000,22(11):1433-1452.
[4]MALEKI S.Deck modeling for seismic analysis of skewedslab-girder bridges[J].Engineering Structures,2002,24(10):1315-1326.
[5]何旭辉,盛兴旺,陈政清.高速铁路PC斜交箱梁桥振动特性模型试验研究[J].铁道学报,2002,24(5):89-92.HE Xuhui,SHEN Xingwang,CHEN Zhengqing.Model teststudy of vibration characteristics on PC skew box girderbridge of civil high speed railway[J].Journal of the ChinaRailway Society,2002,24(5):89-92.
[6]MENG Junyi,GHASEMI H,LUI E M.Analytical and ex-perimental study of a skew bridge model[J].EngineeringStructures,2004,26(2):1127-1142.
[7]卓秋林.公路简支斜梁桥地震反应分析[D].福州:福州大学,2004:14-91.ZHUO Qiulin.Seismic response analysis of simple-suppor-ted skew highway girder bridges[D].Fuzhou:Fuzhou Uni-versity,2004:14-91.
[8]肖一,卓卫东.斜交角对公路连续斜交梁桥地震反应的影响分析[J].福建建筑,2006(6):56-58.XIAO Yi,ZHUO Weidong.Analysis of influence of skewangle on seismic response of continuous skew girder highwaybridges[J].Fujian Architecture&Construction,2006(6):56-58.
[9]重庆交通科研设计院.公路桥梁抗震设计细则JTG/TB02-01-2008[S].北京:人民交通出版社,2008:8,36.
[10]于海龙,朱晞.地震作用下简支梁桥梁间碰撞的反应性能[J].北方交通大学学报,2004,28(1):43-46.YU Hailong,ZHU Xi.Characteristic of pounding respon-seof the simple-supported bridges during earthquake[J].Journal of Northern Jiaotong University,2004,28(1):43-46.
[11]张楠,夏禾,De Roeck Guido.多点激励作用下车-桥-地震耦合系统分析[J].哈尔滨工程大学学报,2011,32(1):26-32.ZHANG Nan,XIA He,De ROECK G.Analysis of a vehi-cle-bridge-earthquake interactive system under multi-sup-port excitations[J].Journal of Harbin Engineering Univer-sity,2011,32(1):26-32.
[12]王军文,李建中,范立础.连续梁桥纵向地震碰撞反应参数研究[J].中国公路学报,2005,18(4):42-47.WANG Junwen,LI Jianzhong,FAN Lichu.Parametricstudy of longitudinal seismic pounding response for contin-uous girder bridges[J].China Journal of Highway andTransport,2005,18(4):42-47.
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