- Re-entrant corners are corners that point into a slab. For example, if one were to pour concrete around a square column, you would create four re-entrant corners. Because the concrete cannot shrink around a corner, the stress will cause the concrete to crack from the point of that corner (See Figure 1).
- Re-entrant corners. Re-entrant corners are corners that point into a slab. For example, if one were to pour concrete around a square column, he would create four re-entrant corners. Because the concrete cannot shrink around a corner, the stress will cause the concrete to crack from the point of that corner (See Figure 1).
This paper examines cracks which occurred at the re-entrant corners at the dapped ends of bulb tee girders used on the MIA Mover APM System at Miami International Airport. Cracks were initially identified during load testing at the precast yard, although typically they did not occur until the beams were erected. The load test and crack mechanism is described herein. Post-erection cracking is compared with that observed under load test conditions and differences are discussed. FDOT criteria were applied in determining the appropriate protection strategy.
- Record URL:
- https://doi.org/10.1061/41193(424)14
- Availability:
- Find a library where document is available. Order URL: http://worldcat.org/isbn/9780784411933
- Supplemental Notes:
- Copyright © 2011 ASCE
- Authors:
- Leverenz, David G.
- Davidson, Thomas E.
- Conference:
- Location: Paris , France
- Date: 2011-5-22 to 2011-5-25
- Publication Date: 2011
Language
![Re Entrant Corner Crack Re Entrant Corner Crack](https://cdnassets.hw.net/dims4/GG/bb4eb35/2147483647/resize/300x>/quality/90/?url=https:%2F%2Fcdnassets.hw.net%2Fc1%2Fdb%2Ff9d9f1944c8d800498adb1b21c00%2Ftmp67e-2etmp-tcm45-332308.jpg)
- English
Media Info
- Media Type: Web
- Monograph Title: Proceedings of the Thirteenth International Conference on Automated People Movers and Transit Systems, 2011
May 18, 2017 Re-entrant corner cracks are especially prevalent in concrete slabs that are relatively thin in comparison to their plan size. In this article, I will focus on re-entrant corners in slabs-on-grade. In a solid object that is subjected to internal or external loads, re-entrant corners create high stress concentrations. If that solid object is concrete, which is strong in compression but weak in. A re-entrant corner creates extreme tensile stress concentration at the corners. As the concrete cures, it tries to linearly shrink and move in two directions at right angles to each other.
Subject/Index Terms
- TRT Terms: Load tests; People movers; Precast concrete
- Identifier Terms: Miami International Airport
- Uncontrolled Terms: Bulbtee girders
- Geographic Terms: Florida
- Subject Areas: Maintenance and Preservation;
![Filler Filler](https://d3i71xaburhd42.cloudfront.net/6ad2fc8843ca1a7791b46747e0ca0ec046000100/4-Figure1-1.png)
Reentrant Structure
Filing Info
Reentrant Corner
- Accession Number: 01365047
- Record Type: Publication
- ISBN: 9780784411933
- Files: TRIS, ASCE
- Created Date: Nov 29 2011 3:00PM