CRACKING OF VOIDED POSTTENSIONED CONCRETE BRIDGE DECKS; THE MACOWAN BRIDGE TEST; PROTOTYPE FOR VOIDED POSTTENSIONED CONCRETE BRIDGE DECKS; MODEL STUDIES FOR VOIDED POSTTENSIONED CONCRETE SLAB BRIDGES; FINITE ELEMENT COMPUTER PROGRAM FOR ANALYSIS OF PLATES WITH BENDING AND IN-PLANE STRESSES
This study of concrete cracking, included monitoring of deformations and temperature variations of prototype bridges, acrylic modelling of two typical prototype bridges, building of an automated finite element computer program, surveying and coring a large number of bridge decks, chemical analysis for chloride content, long-term testing of voided, micro-concrete models, constructing a representative cross-sectional slice of a prototype bridge, and using rigid foams as void-formers. The temporary measure of applying a waterproofing membrane covered with an asphaltic concrete wearing surface can promote deterioration in newly-constructed decks. With the use of appropriate 2- and 3-dimensional analysis, it is possible to achieve crack control by applying adequate transverse, skew and/or fanned prestressing. The second volume of this report describes field tests carried out on an underpass structure which has a 3-span continous, posttensioned concrete deck which was cast in-situ and contains longitudinal circular voids. Measurements are presented for various parameters from the time of placing the concrete, through prestressing, and also for the deck subjected to static and dynamic loading. Local strains, internal cracking and the propagation of cracks are discussed. The third section of this report discusses design, construction, instrumentation, and loading of scale models of a 3-span, straight slab bridge and a two span, skew slab bridge. Both the models and instrumentation responded elastically to loads. Conclusions (based on this study) are presented which relate to transverse tensile stresses, transverse prestress and model structures which behaved as orthotropic slabs. The forth volume of this report covers the computer stress analysis of continuous voided, posttensioned concrete bridge decks performed to explain the appearance of cracks around the area of the voids after construction. The limitations of the 2-dimensional analysis including bending and in-plane stresses, were evident in end anchorage zones, at support points and in the wing area of the decks. The system of finite element programs are outlined here which require approximately 220k bytes of core stone and which was developed for the IBM 360/75 computer, compiled under Fortran H Level 2.
- This document contains a series of four reports.
Ministry of Transportation and Communications, CanadaResearch and Development Division
Downsview, ONo M3M 1J8, Canada
- Csagoly, P
- Holowka, M
- Campbell, T I
- Meades, P
- Green, R
- McNeice, G M
- Publication Date: 1975-1
- Features: Figures; References;
- Pagination: 49 p.
- TRT Terms: Bridge decks; Bridge design; Bridges; Chemical analysis; Chlorine compounds; Compression tests; Concrete; Cores (Specimens); Deformation; Field tests; Finite element method; Foams; Fracture mechanics; Loads; Mathematical models; Posttensioning; Prestressing; Prototypes; Structural design; Surveying; Temperature; Void ratios; Waterproofing materials
- Uncontrolled Terms: Loading; Models
- Old TRIS Terms: Coring; Void
- Subject Areas: Bridges and other structures; Highways;
- Accession Number: 00097751
- Record Type: Publication
- Report/Paper Numbers: RR193, 194, 195, 196
- Files: TRIS
- Created Date: Sep 30 1975 12:00AM