Research on Concrete Vertical Precompressive Stress Field at Webs of Box Girder Bridge

Based on Fourier series, an analytic formula for analyzing the prestress in the web of box girder with single bar was deduced through simplifying the action of single vertical prestress bar as a couple of concentrated forces with equal value but opposite direction acting on a thin rectangular board with infinite length. The vertical compress stress distribution in the web gotten from the analytic solution basically agrees with that from the ANASYS finite element solution. The analysis result indicates that the vertical compressive stress distribution in the webs meets the normal distribution and small tensile stresses are created aside the tendons. Field tests on a real bridge also demonstrate that the analytic formula is adaptable to the solution of the superposition of vertical prestress in the web. Furthermore, the feature of the vertical prestressing field along the height of the web was analyzed and modifying formula was presented by introducing a compensation factor K. In addition, the μ-K curves of the webs under the action of prestressing tendons with different spacing intervals were presented.

Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/10020268
Authors:
- Shen, Mingyan
- Zhong, Xingu
- Shu, Xiaojuan
Publication Date: 2009-6

Language

English

Media Info

Media Type: Print
Features: Figures; References;
Pagination: pp 65-70, 76
Serial:
- Journal of Highway and Transportation Research and Development
- Volume: 4
- Issue Number: 1
- Publisher: Research Institute of Highway, Ministry of Transport
- ISSN: 1002-0268

Subject/Index Terms

TRT Terms: Box girder bridges; Bridge engineering; Concrete structures; Prestressing
Subject Areas: Bridges and other structures; Highways; I24: Design of Bridges and Retaining Walls;

Filing Info

Accession Number: 01149105
Record Type: Publication
Files: TRIS
Created Date: Jan 27 2010 8:18AM