长江科学院院报 ›› 2015, Vol. 32 ›› Issue (12): 24-27.DOI: 10.11988/ckyyb.20140546

• 水资源与环境 • 上一篇    下一篇

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   

  1. 1.华北水利水电大学 土木与交通学院,郑州 450045;2.北京工业大学 建筑工程学院,北京 100124;3.郑州大学 土木学院,郑州 450000
  • 收稿日期:2014-07-03 出版日期:2015-12-20 发布日期:2015-12-11
  • 作者简介:吴泽玉(1976-),男,河南固始人,讲师,博士,主要从事复杂结构体系选型与振动控制研究,(电话)13598437507
  • 基金资助:

    国家自然科学基金项目(50978232);河南省教育厅项目(14B560029)

Research on Sequence of Prestressing Tension in Aqueduct Based onCharacteristic Parameters

WU Ze-yu1,2,WANG Dong-wei3   

  1. 1.School of Civil Engineering and Communication,North China University of Water Resources and ElectricPower, Zhengzhou 450045,China;2.College of Architecture & Civil Engineering,Beijing University of Technology,Beijing 100124,China;3.School of Civil Engineering,Zhengzhou University,Zhengzhou 450000,China
  • Received:2014-07-03 Published:2015-12-20 Online:2015-12-11

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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。

关键词: 特征参量, 渡槽, 预应力, 张拉顺序, 动力特性

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.

Key words: characteristic parameter, aqueduct, prestress, tension sequence, dynamic properties

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