Behavior of preflex beam in manufacturing process
- 210 Downloads
This paper presents the results of research on the behavior of preflex beam considering manufacturing process. A series of test-specimen were made and tested, which included the traditional preflex beam, preflex beams with additional shear connectors above the bottom flange and the beams with some shear keys. The test results are compared with the values given in the design code and analytical results using finite element method with 3-D model. Time dependent effects are also estimated and compared with the values given in design code. It is found that the effects of residual stress in steel girder are greater than expected, which results in more loss of camber, and the produced stress due to shrinkage of casing concrete are far greater than the values given in design code, which may cause the tension cracks in casing concrete of bottom flange. Based on the results of the study, a few proposals are made for improving the quality and durability of preflex beam.
Keywordspreflex beam shear key creep shrinkage manufacturing process
Unable to display preview. Download preview PDF.
- ACI 209 Committee. (1993). “Prediction of Creep, Shrinkage and Temperature Effect in Concrete Structures.” ACI 209R-92, ACI Concrete Practice Manual.Google Scholar
- International Federation for Structural Concere (fib), (1999). “Structural Concrete, the Textbook on Behaviour, Design and Performance.” Federal Institute of Technology Lausanne-EPFL. Department Genie Civil.Google Scholar
- KSCE. (1993). “Specification for Design of Preflex Beam.” Ministry of Construction.Google Scholar
- TNO. (1997). DIANA 6.1 User's Manual.Google Scholar