Date of Award
7-1-1967
Document Type
Thesis
Degree Name
Master of Science (MS)
Department
Civil Engineering
Abstract
In this investigation a comparative study is made of the dynamic behavior of rigid and elastomeric bearings of a model bridge subjected to eccentric vibratory loading.
Bor the experimental portion, static and vibration tests were conducted using an approximate one-third scale model bridge 25 ft long and 10 ft wide, with a composite section of steel girders and concrete bridge deck slab. A counterrotating eccentric weight oscillator was used to produce oscillatory loads on the bridge. Tests were conducted with three types of bearing conditions: curved steel sole plates, 64 durometer and 49 durometer hardness neoprene pads.
A theoretical analysis was also made and the values obtained for natural frequencies and deflections were compared with those obtained experimentally.
Some of the conclusions are: (a) for a statically applied load the total midspan deflection is greater for neoprene than steel supports; (b) neoprene bearing pads add to the damping of the bridge; (c) in general, though not always, the maximum strain and also the total and the net deflection /' in the girders, at the respective natural frequency for each bearing condition, are greater for steel bearings; (d) the dynamic stress and deflection, and also their amplification factors, of a loaded bridge are less than those of an unloaded bridge; (e) at low and high frequencies the magnitudes of strain and deflection are quite close for different bearing conditions.
Recommended Citation
Bose, Subhas Kumar, "Dynamic Behavior Due to an Eccentrically Applied Lateral Vibration of a Model Bridge With Rigid and Elastomeric Bearings" (1967). Theses and Dissertations. 3999.
https://commons.und.edu/theses/3999