Interaction of Variable Axial Load and Shear Effects in RC Bridges
Holub, Curtis J.
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https://hdl.handle.net/2142/83404
Description
Title
Interaction of Variable Axial Load and Shear Effects in RC Bridges
Author(s)
Holub, Curtis J.
Issue Date
2009
Doctoral Committee Chair(s)
Elnashai, Amr S.
Department of Study
Civil Engineering
Discipline
Civil Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Civil
Language
eng
Abstract
An additional 32 small-scale tests were completed to investigate the influence of the amplitude of axial loading cycles, the frequency of axial loading cycles, and sequencing or phase of axial loading peaks relative to lateral loading. Generally, behavior of the specimens including aspects of strength, stiffness, energy absorption, and failure mode were found to be highly dependent on the axial loading pattern. High levels of constant or coincident compression resulted in increases in demands that were unmatched by any increases in capacity resulting in brittle shear-axial failures. Constant or coincident tension was found to reduce peak shear loads and promote relatively ductile behavior. High frequency oscillation of axial loading was found to be more damaging than comparable constant loads. Finally, the sequencing or phasing of peak axial loads was critical to behavior and could on its own dictate failure mode. This investigation clearly demonstrated the detrimental effects of variable axial loading.
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