Slender Concrete Columns under Sustainted Load

by Brij B. Goyal, Struct. Engr.; Brice, Petrides and Assoc., Inc., Waterloo, IA,
Neil Jackson, Sr. Lecturer; Civ. Engrg. Dept., Univ. of Dundee, Dundee, Scotland,

Serial Information: Journal of the Structural Division, 1971, Vol. 97, Issue 11, Pg. 2729-2750

Document Type: Journal Paper


A theoretical and experimental investigation into the effect of sustained load on the ultimate load of eccentrically loaded slender reinforced concrete columns is described. The results of short-term loading tests on 26 pin-ended concrete columns and sustained loading tests on twenty similar columns at load levels of 0.4 and 0.6 of their short-term load carrying capacities are given. The latter show significant reductions in strength in some cases when the load is increased under short-term loading conditions following the sustained load period. An analytical procedure for predicting the behavior of such columns under successive short-term, sustained, and short-term loading is described. Comparisons between experimental and theoretical results show that the behavior of columns under both short-term and sustained load can be predicted closely using the proposed analysis.

Subject Headings: Load tests | Ultimate loads | Concrete columns | Load factors | Reinforced concrete | Structural behavior | Load bearing capacity | Comparative studies

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