http://worldcat.org/entity/work/id/5694841

Load capacity of jack arch bridges

A 76-year-old jack-arch bridge was tested to failure to obtain information on load capacity and the degree of composite action between the steel beams and concrete deck. This work was started because despite the good condition of the majority of the 1300 jack-arch bridges in New York, load-rating estimates indicate that they are inadequate to support modern highway traffic. The 39-ft-span test structure consisted of six 24-in. deep I-beams spaced at 36 in. Instrumentation consisted of electrical-resistance strain gages on both flanges at midspan, end-rotation measurements devices at the ends of two beams, and deflectometers at midspan. The bridge was loaded to produce a 6-ft region of constant moment at the center of the span. Loads were applied through hydraulic jacks reacting against grouted anchors beneath the structure.

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