Title:
Capacity of Circular Bridge Columns Subjected to Base Excitation
Author(s):
Lawrence L. Dodd and Nigel Cooke
Publication:
Structural Journal
Volume:
97
Issue:
2
Appears on pages(s):
297-307
Keywords:
bridges; columns (supports); ductility; hinges (structural); reinforced concrete.
DOI:
10.14359/860
Date:
3/1/2000
Abstract:
.Fourteen single-stem cantilever columns with various aspect ratios and axial-load ratios were tested on a shaketable. Test results are compared with state-of-the-art methods used to calculate the strength and displacement capacity of columns. It was concluded that: a) large displacement and curvature ductilities were achieved, even though some of the columns had much less spiral reinforcement than required by modern codes; b) buckling of the longitudinal reinforcing steel initiated failure in all columns; c) low-level displacement cycling, less than that which causes buckling of the longitudinal steel, softens the column but does not affect ductility capacity; d) the effective plastic hinge length is not consistently predicted by present methods, but the calculated displacement capacity using the predicted plastic hinge length is conservative; and e) a possible increase in flexural strength from dynamic excitation was observed.