Date of Award
Master of Science
Civil, Construction, and Environmental Engineering
Civil Engineering (Structural Engi neering)
A new connection detail utilizing a system of threaded "inclined bars" and receivers to connect a precast concrete barrier to the deck was previously experimentally researched for accelerated bridge construction. Utilizing LS-DYNA, a FEM model is now constructed to allow for further research, including variations and dynamic loading.
The modeling process is explained. The model is validated using previous experimentally derived results. Barrier deflection, reinforcement strains, and failure behavior is compared to validate the analytical model. The barrier deflection of the analytical model is quite similar to the experimental results. The reinforcement strain and failure behavior results are comparable, and any difference is justified.
The model is modified to allow a longer section of the barrier system to be examined. First, two connected barriers are analyzed. The barriers are loaded at several locations for comparison. Then, a system incorporating the equivalent of three barriers is modeled. Deck concrete strengths, reinforcement spacings, and thicknesses are researched with this system.
Dynamic (impact) loads are also compared to a static load. Results show that the strain values in the connection detail are vastly different. The study also shows that a longer section of a barrier system engages to counteract a static loading verses an impact loading.
Coblentz, Kenneth, "Analysis of a precast concrete barrier subjected to varying loads" (2020). Graduate Theses and Dissertations. 17913.