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Analysis of the construction process of cable-stayed bridges built on temporary supports

机译：临时支撑斜拉桥施工过程分析

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摘要

The temporary supports erection method is a fast and economical way of building cable-stayed bridges. In this method the bridge deck is first erected on a set of temporary and permanent supports and then, the stays are successively placed and tensioned according to a predefined tensioning sequence. A proper definition and analysis of this sequence is very complex as the structure is highly statically indeterminate, exhibits a non linear behavior and has a changing static scheme. Despite its importance, no specific research referring to the modeling of the temporary support erection method has been found as most of the modeling procedures are proposed for the alternative erection technique, the cantilever erection method. The modeling carried out by most of these methods is based on the opposite construction sequence followed on site, this is to say, the structure is disassembled from the desired final stage (Objective Completion Stage, OCS). A procedure, the Backward Algorithm (BA), is formally presented in this paper for calculation of the erection of cable-stayed bridges built on temporary supports. Because of its simplicity the BA can be reproduced by any structural code that enables the modeling of the prestresses of the stays by means of imposed strains or imposed temperature increments. Another advantage is that no separate models are needed to calculate the evolution of stresses in the strands when the strand by strand tensioning technique is used. Furthermore, the stay elongations when prestressed can be easily obtained when the stays are prestressed in a single operation or strand by strand. This information is important to control the correct and safe prestressing of the stay on site. In addition, it also help the designer to control if the anchor wedge bites the strand in the same position several times during the prestressing process.
机译：临时支撑架设方法是建造斜拉桥的一种快速，经济的方法。在这种方法中，桥面板首先被竖立在一组临时和永久性支撑上，然后，根据预定的张紧顺序，依次放置并张紧撑杆。对该序列的正确定义和分析非常复杂，因为该结构在静态上是高度不确定的，具有非线性行为，并且具有变化的静态方案。尽管它的重要性，但由于针对大多数的替代安装技术（悬臂安装方法）提出了大多数建模程序，因此尚未找到有关临时支撑安装方法建模的具体研究。通过这些方法中的大多数执行的建模基于现场遵循的相反构造顺序，也就是说，结构是从所需的最终阶段（目标完成阶段，OCS）中分解出来的。本文正式提出了一种称为“后退算法”（BA）的程序，用于计算在临时支撑物上建造的斜拉桥的架设。由于其简单性，BA可以通过任何结构代码来复制，这些结构代码可以通过施加的应变或施加的温度增量来建模撑杆的预应力。另一个优点是，当使用通过线束张紧技术的线束时，不需要单独的模型来计算线束中的应力变化。此外，当通过单次操作或逐股地对支柱进行预应力时，可以容易地获得预应力时的支柱伸长率。这些信息对于控制正确和安全的住宿压力非常重要。此外，它还可以帮助设计人员控制在预应力过程中，锚定楔块是否多次在同一位置咬合钢绞线。

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  • 来源
    《Engineering Structures》 |2012年第7期|p.95-106|共12页
  • 作者

    J.A. Lozano-Galant; I. Paya-Zaforteza; D. Xu; J. Turmo;

  • 作者单位

    Department of Civil Engineering, Castilla-La Mancha University, Avda. Camilo Jose Cela s, 13071 Ciudad Real, Spain;

    Institute de Ciencia y Tecnologia del Hormigon (ICITECH), Departamento de Ingenieria de la Construction y Proyectos de Ingenieria Civil, Universidad Politecnica de Valencia, Camino de Vera s, 46023 Valencia, Spain;

    Department of Bridge Engineering, Tongji University, 1239, Siping Road, 200092 Shanghai, China;

    Department of Construction Engineering, Universitat Politecnica de Catalunya, BarcelonaTech, c/Jordi Girona 1-3, C1, 08034 Barcelona, Spain;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    cable-stayed bridges; construction process; temporary supports erection method; backward modeling;

    机译：斜拉桥;施工过程;临时支撑架设方法;向后建模;

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