悬臂法施工桥梁的流变效应

IF 0.1 Q4 ENGINEERING, CIVIL
Bartosz Pisarek, C. Machelski
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引用次数: 1

摘要

摘要采用悬臂浇筑技术建造的桥梁的一个特点是挠度过大,这是混凝土和预应力钢筋流变过程的结果。这些挠度可能是由材料的破坏引起的,例如混凝土开裂,以及桥梁结构静态方案的改变,例如支架的沉降。结构运行的最终结果是其坡度线的变化,本文将其视为桥梁跨度的挠度线。本文的目的是确定结构在支架上的旋转参与最大长度跨度的变形。作者提出了一种确定偏转函数和转角的算法,这些函数和转角是根据梁的曲率变化获得的。其特点是对桥梁中发生的流变过程进行了准确的映射,该映射是根据现场大地测量获得的坡度线的变化进行计算的。本文提出了一个箱形截面悬臂的通用几何指标,该指标是为施工阶段计算的,并为运营阶段提供了不同的指标。它们可用于各种桥梁的比较分析。对悬臂桥最长跨度运行阶段挠度的分析表明,旋转角度对支架有很大影响。在本文中,这样一组桥梁被认为是不稳定的,其中静态方案从确定的悬臂状态(施工阶段)转变为不同跨度长度的多跨系统(运营阶段)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Rheological Effects in the Bridges Constructed with Cantilever Method
Abstract A characteristic feature of bridges made using cantilever concreting technology is their excessive deflections, which are a result of rheological processes in concrete and prestressing steel. These deflections can be caused by the destruction of the material, e.g. concrete cracking, as well as the changing of the static scheme of the bridge structure, such as the subsidence of supports. The final result of a structure’s operation is changes in its grade line, which in this paper are considered as the deflection line of a bridge’s span. The purpose of the paper is to determine the participation of a structure’s rotation over supports in the deformation of the span with the largest length. The authors proposed an algorithm for determining the deflection function and rotation angles, which were obtained on the basis of changes in the curvature of the beam. It is characterised by an accurate mapping of the rheological processes that occur in the bridge, which is calculated on the basis of the changes of the grade line obtained from geodetic measurements on site. The paper proposes a general geometric indicator of the box cross-section cantilever, which is calculated for the construction phase, and a different indicator for the operation phase. They can be used for comparative analyses of various bridges. The analysis of deflections in cantilever bridges during the operation phase of their longest spans indicates that there is a significant influence of the angles of rotation over the supports. In the paper, such a group of bridges is qualified as unstable, in which the static scheme changes from a determinate cantilever state (the construction phase) into a multi-span system with different span lengths (the operation phase).
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