基于特征参量控制的渡槽预应力张拉顺序研究

吴泽玉; 王东炜

doi:10.11988/ckyyb.20140546

PDF(1380 KB)

raybet体育在线院报 ›› 2015, Vol. 32 ›› Issue (12) : 24-27. DOI: 10.11988/ckyyb.20140546

水资源与环境

基于特征参量控制的渡槽预应力张拉顺序研究

吴泽玉^1,2,王东炜³

作者信息 +

Research on Sequence of Prestressing Tension in Aqueduct Based onCharacteristic Parameters

WU Ze-yu^1,2,WANG Dong-wei³

Author information +

文章历史 +

摘要

为了得到合理预应力张拉顺序,提出利用特征参量指导预应力张拉的新途径。分别对矩形带肋和无肋渡槽及U形渡槽动力特性进行分析。结果表明:对于U形渡槽,竖向预应力和环向预应力明显降低结构整体刚度,但预应力效应并不改变振型出现的先后顺序;通过对矩形无肋渡槽6种预应力张拉顺序进行分析,得到合理的预应力张拉顺序为:先张拉40%纵向预应力,再张拉竖向预应力,然后张拉剩余的60%纵向预应力,最后张拉横向预应力。矩形无肋渡槽的这种张拉顺序不仅避免了竖向预应力对结构整体刚度的过大影响,而且能抵消结构早期由于自重产生的不利挠度。研究的渡槽预应力张拉顺序对构件力学性能改变的影响可降低到最小。

Abstract

In order to obtain reasonable sequence of prestressing tension,we put forward a new way by using characteristic parameters to guide prestressing tension.Dynamic characteristics of rectangular aqueducts with rib and without rib,and U-shape aqueduct are respectively analyzed.The results show that,as for U-shape aqueduct,the vertical prestress and the circumferential prestress can obviously reduce the overall stiffness of the structure, but the prestressing effect does not change the order of mode of vibration.Through analyzing 6 kinds of sequence of prestressing tension for rectangular aqueduct without rib,we obtain a reasonable sequence:Firstly,prestress in the longitudinal direction is tensioned up to 40% of the maximum.Secondly,we tension the prestress in the vertical direction.Then,the rest of prestress in the longitudinal direction is tensioned.Finally,we tension the prestress in the transverse direction.This sequence of prestressing tension of rectangular aqueduct without rib can not only avoid the excessive influence of vertical prestress on the overall rigidity of the aqueduct,but also counteract the negative deflection due to gravity of the structure at early stage.Influence of this sequence of prestressing tension on mechanical properties of aqueduct is the smallest in comparison with other sequences.

导出引用

吴泽玉,王东炜. 基于特征参量控制的渡槽预应力张拉顺序研究[J]. raybet体育在线院报. 2015, 32(12): 24-27 https://doi.org/10.11988/ckyyb.20140546

WU Ze-yu,WANG Dong-wei. Research on Sequence of Prestressing Tension in Aqueduct Based onCharacteristic Parameters[J]. Journal of Changjiang River Scientific Research Institute. 2015, 32(12): 24-27 https://doi.org/10.11988/ckyyb.20140546

中图分类号： TV312

参考文献

[1] TAKABATAKE H.Effects of Dead Loads in Dynamic Plates[J].Structural Engineering,1990,118(1):34-51.
[2] TAKABATAKE H.Effects of Dead Loads in Static Bea-ms[J].Structural Engineering,1989,116(4):1102-1120.
[3] TAKABATAKE H.Effects of Dead Loads on Natural Frequencies of Beams[J].Structural Engineering,1991,117(4):1039-1120.
[4] TAKABATAKE H.Cantilevered and Linearly Tapered Thin-walled Members[J].Engineering Mechanics,1988,116(4):733-750.
[5] CLOUGH R W,PENZIEN J.Dynamics of Structures[M].Berkeley,California:Computers and Structures,1995:201-202.
[6] 季三荣,王东炜,赵骞.基于模态分析的钢管脚手架平面支撑刚度研究[J].郑州大学学报(工学版),2010,31(4):31-35.(JI San-rong,WANG Dong-wei,ZHAO Qian.Stiffness Study of Pipe Scaffold Planar Support System by the Model Analysis[J].Journal of Zhengzhou University(Engineering Science),2010,31(4):31-35.(in Chinese))
[7] 王东炜,张奇伟,王用中.基于模态分析的鄄城黄河公路大桥优化设计[J].郑州大学学报(工学版),2010,31(6):1-5.(WANG Dong-wei,ZHANG Qi-wei,WANG Yong-zhong.Optimization Design of the Yellow River Main Bridge in Juancheng Based on the Researches on the Dynamic Characteristics[J].Journal of Zhengzhou University(Engineering Science),2010,31(6):1-5.(in Chinese))
[8] 张社荣,祝青,李升.大型渡槽数值分析中预应力的模拟方法[J].水利发电学报,2009,28(3):97-100.(ZHANG She-rong,ZHU Qing,LI Sheng.Simulation Methods of Prestress in Numerical Analysis of Large Aqueduct[J].Journal of Hydroelectric Engineering,2009,28(3):97-100.(in Chinese))
[9] 夏富洲,王长德,曹为民,等.大流量预应力渡槽设计与施工技术研究[J].南水北调与水利科技,2009,7(6):47-49.(XIA Fu-zhou,WANG Chang-de,CAO Wei-min,et al.Research on Design and Construction Technology for Large Flow Prestressed Concrete Aqueduct[J].South-to-North Water Transfers and Water Science & Technology,2009,7(6):47-49.(in Chinese))
[10]李俊宏,何淑媛,袁勤国.大型渡槽槽身施工技术进展[J].中国农村水利水电,2005,(10):61-63.(LI Jun-hong,HE Shu-yuan,YUAN Qin-guo.Development of Construction Technique of Large-sized Aqueduct Body[J].China Rural Water and Hydropower,2005,(10):61-63.(in Chinese))