Integral abutment bridges have been constructed by State Departments of Transportation for a number of years. These bridges have been found to be cost effective from both an initial cost and life-cycle cost analysis. However, common design guidelines are lacking and non-uniform limitations on IAB design are imposed by different agencies. In order to evaluate design guidelines, the Vermont Agency of Transportation has initiated a program offield instrumentation and analysis to evaluate the performance of three IABs currently under construction. The research components are being conducted by the University of Massachusetts at Amherst. Three bridges are included, a straight bridge with 43.0 meter span, a 15 degree skew bridge with 37.0 meter span, and a curved two-span continuous structure with 11.25 degrees of curvature and 68.0 meter total bridge length. The bridges are instrumented with 83, 89, and 131 gages, respectively. Instrumentation includes strain gages, pressure cells, crackmeters, inclinometers, tiltmeters andthermistors. This paper describes the project scope, bridge details and instrumentation at these sites.
Abstract