Type of Document Master's Thesis Author Scott, Jana URN etd-07072010-112155 Title Interface Shear Strength in Lightweight Concrete Bridge Girders Degree Master of Science Department Civil Engineering Advisory Committee
Advisor Name Title Roberts-Wollmann, Carin L. Committee Chair Cousins, Thomas E. Committee Co-Chair Moen, Cristopher D. Committee Member Keywords
- Horizontal Shear
- Lightweight Concrete
- Precast Girder
- Cast-In-Place Deck
- Shear Friction
Date of Defense 2010-06-18 Availability unrestricted AbstractPrecast girders and cast-in-place decks are a typical type of concrete bridge construction. A key part of this type of construction is developing composite action between the girder and deck. In order to develop composite action, adequate horizontal shear resistance must be provided at the interface. As lightweight concrete is increasingly being used in bridge designs, it is important to understand the horizontal shear behavior of lightweight concrete.
The current AASHTO LRFD Specification provides design equations for horizontal shear strength of both lightweight and normal weight concrete. Thirty-six push-off tests were performed to determine if the current code equations accurately predict the horizontal shear strength of precast girders and cast-in-place decks for both normal weight and lightweight concrete. The different test series investigated effects from lightweight and normal weight concrete used for the girder/slab combination and the quantity of shear reinforcement provided across the interface.
The test results were compared to the results predicted by current design equations. A structural reliability analysis was performed and the test-to-predicted statistics were used to define LRFD resistance factors and quantify the probability of failure. The current design equations were found to be conservative and more conservative for lightweight concrete than for normal weight concrete.
Filename Size Approximate Download Time (Hours:Minutes:Seconds)
28.8 Modem 56K Modem ISDN (64 Kb) ISDN (128 Kb) Higher-speed Access Scott_JL_T_2010.pdf 5.93 Mb 00:27:28 00:14:07 00:12:21 00:06:10 00:00:31
If you have questions or technical problems, please Contact DLA.