斜拉桥索塔锚固区环向预应力布置形式研究
|
摘要
斜拉桥索塔锚固区常通过配置环向预应力束的方式来抵消斜拉索强大的索力作用。为得出索塔锚固区预应力筋的合理布置形式,以沭河景观大桥为工程背景,提出了4种不同的环向预应力布置形式,采用大型通用有限元软件建立桥塔三节段模型进行分析,以开裂均衡性系数、应力分布为判据进行比较。结果表明,环向预应力筋横桥向开口布置远优于顺桥向开口布置;环向预应力筋横桥向开口布置中,双层"U"形筋优于单层"U"形筋,但其钢绞线用量多;横桥向开口交替布置"U"形预应力筋是最合理的布置形式。沭河景观大桥索塔锚固区采用了最合理的环向预应力布置形式——横桥向开口交替布置"U"形预应力筋。
Looped prestresssing tendons are added to the cable-pylon anchor zone in a cablestayed bridge to counteract the effect of strong stay cable forces.To examine the rational arrangement of prestressing tendons in the cable-pylon anchor zone,the Shuhe River Landscape Bridge in Xinyi City was taken as the study background,and four ways of looped prestressing arrangement were proposed.The finite element software was used to establish the three-segmental model of the pylon,and the cracking equilibrium factor and the way of stress distribution were taken as the gauges of the comparison.The results show that the way of open arrangement of the looped prestressing tendons along the transverse direction is far better than the open arrangement along the longitudinal direction.If the former way is chosen,the double-layer U-shaped tendons are better than the single-layer U-shaped tendons,but will cost more strands.The U-shaped open and alternate arrangement of the prestressing tendons along the transverse bridge direction is the most rational arrangement.The prestressing tendons in the cable-pylon anchor zone of the Shuhe River Landscape Bridge in Xinyi City adopts the most rational form of arrangement,U-shaped open and alternate arrangement of prestressing tendons.
Looped prestresssing tendons are added to the cable-pylon anchor zone in a cablestayed bridge to counteract the effect of strong stay cable forces.To examine the rational arrangement of prestressing tendons in the cable-pylon anchor zone,the Shuhe River Landscape Bridge in Xinyi City was taken as the study background,and four ways of looped prestressing arrangement were proposed.The finite element software was used to establish the three-segmental model of the pylon,and the cracking equilibrium factor and the way of stress distribution were taken as the gauges of the comparison.The results show that the way of open arrangement of the looped prestressing tendons along the transverse direction is far better than the open arrangement along the longitudinal direction.If the former way is chosen,the double-layer U-shaped tendons are better than the single-layer U-shaped tendons,but will cost more strands.The U-shaped open and alternate arrangement of the prestressing tendons along the transverse bridge direction is the most rational arrangement.The prestressing tendons in the cable-pylon anchor zone of the Shuhe River Landscape Bridge in Xinyi City adopts the most rational form of arrangement,U-shaped open and alternate arrangement of prestressing tendons.
引文
[1]XU Zhouyuan,WANG Cunguo,ZHAO Renda,et al.Full-Scale Model Test for One Box with Three Rooms Cable-Pylon Anchorage Zone of Cable-stayed Bridge[C]//Third International Conference on Transportation Engineering(ICTE),ASCE,2011:1 970-1 976.
[2]沈璐,邱文亮.大跨度斜拉桥索塔锚固区环向钢束预应力损失分析与试验研究[J].水利与建筑工程学报,2016,14(2):96-99.
[3]朱经纬,王江波,冯云成.索塔锚固区拓扑优化拉压杆模型及预应力构造分析[J].桥梁建设,2017,47(5):59-64.
[4]陈建阳,徐国平,刘丽,等.大吨位小半径环向预应力在斜拉桥索塔锚固区中的应用研究[J].桥梁建设,2001(2):12-15.
[5]Janjic D,Pircher M,Pircher H.Optimization of Cable Tensioning in Cable-stayed Bridges[J].Journal of Bridge Engineering,2003,8(3):131-137.
[6]舒江,师少辉,朱玉.武汉西四环汉江特大桥总体设计[J].桥梁建设,2017,47(6):84-88.
[7]梅应华,胡可,朱大勇.芜湖长江公路二桥桥塔锚索系统性能研究[J].世界桥梁,2017,45(6):39-44.
[8]项贻强,易绍平,杜晓庆,等.南京长江二桥南汊桥斜拉索塔节段足尺模型的研究[J].土木工程学报,2000,33(1):15-22.
[9]蔡陶,何裕仁,李洪乾.大吨位小曲率半径U形索伸长值的控制[C]//中国公路学会桥梁和结构工程学会2001年桥梁学术讨论会.重庆,2001:326-330.
[10]JTG D62-2004,公路钢筋混凝土及预应力混凝土桥涵设计规范[S].
[11]刘钊,孟少平,吕志涛.两座大型斜拉桥索塔锚固区模型试验及对比研究[J].中国工程科学,2003,5(12):48-54.
[2]沈璐,邱文亮.大跨度斜拉桥索塔锚固区环向钢束预应力损失分析与试验研究[J].水利与建筑工程学报,2016,14(2):96-99.
[3]朱经纬,王江波,冯云成.索塔锚固区拓扑优化拉压杆模型及预应力构造分析[J].桥梁建设,2017,47(5):59-64.
[4]陈建阳,徐国平,刘丽,等.大吨位小半径环向预应力在斜拉桥索塔锚固区中的应用研究[J].桥梁建设,2001(2):12-15.
[5]Janjic D,Pircher M,Pircher H.Optimization of Cable Tensioning in Cable-stayed Bridges[J].Journal of Bridge Engineering,2003,8(3):131-137.
[6]舒江,师少辉,朱玉.武汉西四环汉江特大桥总体设计[J].桥梁建设,2017,47(6):84-88.
[7]梅应华,胡可,朱大勇.芜湖长江公路二桥桥塔锚索系统性能研究[J].世界桥梁,2017,45(6):39-44.
[8]项贻强,易绍平,杜晓庆,等.南京长江二桥南汊桥斜拉索塔节段足尺模型的研究[J].土木工程学报,2000,33(1):15-22.
[9]蔡陶,何裕仁,李洪乾.大吨位小曲率半径U形索伸长值的控制[C]//中国公路学会桥梁和结构工程学会2001年桥梁学术讨论会.重庆,2001:326-330.
[10]JTG D62-2004,公路钢筋混凝土及预应力混凝土桥涵设计规范[S].
[11]刘钊,孟少平,吕志涛.两座大型斜拉桥索塔锚固区模型试验及对比研究[J].中国工程科学,2003,5(12):48-54.