• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Romanian Journal of Transport Infrastructure >Rheological Effects in the Bridges Constructed with Cantilever Method
【24h】

Rheological Effects in the Bridges Constructed with Cantilever Method

机译：用悬臂法构造的桥梁中的流变效应

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

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).
机译：使用悬臂混凝土技术制造的桥梁的特征是它们的过度偏转，这是混凝土和预应力钢中流变过程的结果。这些偏转可能是由材料的破坏引起的，例如，混凝土裂缝，以及桥梁结构静态方案的变化，如支撑件沉降。结构操作的最终结果是其等级线的变化，本文被认为是桥梁跨度的偏转线。本文的目的是确定结构旋转在变形的支持上的参与长度最大的跨度。作者提出了一种用于确定偏转功能和旋转角度的算法，其基于光束曲率的变化获得。其特征在于，在桥中发生的流变过程的精确映射，这是基于从现场的大地测量测量获得的等级线的变化计算的。本文提出了盒子横截面的一般几何指示器悬臂，用于施工阶段，以及用于操作阶段的不同指标。它们可用于各种桥梁的比较分析。在其最长跨度的操作阶段期间悬臂桥中偏转的分析表明，在支撑件上的旋转角度存在显着影响。在纸质中，这种桥梁的资格是不稳定的，其中静态方案从确定的悬臂状态（构造阶段）改变为具有不同跨度长度的多跨度系统（操作阶段）。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号