IN TR O D U CTIO N -TH E PROBLEM A few years ago a problem that previously had been a modest highway maintenance concern suddenly became a major source of dif­ ficulty and expense to highway departments in many areas of the coun­ try; including Indiana. In brief, concrete bridge decks, some new, started to spall, then delaminate, then come apart in relatively large chunks. The problem was quick...

Seismic/ultrasonic methods can be successfully used in condition assessment of bridge decks by evaluating changes in material characteristics and detection of development of defects and zones of deterioration. The impact echo method is of special benefit in evaluation of corrosion induced deck delamination due to its nondestructive nature and ability to detect delaminated zones at various stage...

In the present study, an experimental investigation was conducted to characterize the unsteady vortices and turbulent flow structures around twin-box-girder (TBG) bridge deck models with and without cross beams. While the oncoming wind speed was fixed at U11⁄48.0 m/s (i.e., the corresponding Reynolds number, Re1⁄4 1:01 10, based on the height of the box girder) during the experiments, the gap w...

In this study, structural analyses were conducted to analyze the performance of a bridge which friction pendulum systems (FPSs) applied using different models. A Coulomb model and rate dependent constructed coefficient PVDF/MgO material effect analysis The uses single regardless velocity, while can reflect change in with velocity. Nonlinear time history seismic fragility confirm responses bridg...

Single-track railway bridges are susceptible of experiencing high levels vertical acceleration on the deck that may be dangerously accentuated at resonance. This is especially critical for short-to-medium span simply supported bridges. problem can compromise safety trains and increase maintenance costs track. The main objective this work to investigate influence ballasted track dynamic behaviou...