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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Deformations in Service of Reinforced Concrete Columns
Author(s): R.N. Swamy and P. Arumugasaamy
Publication: Special Publication
Appears on pages(s): 375-408
Keywords: age; (supports); deformation; field tests; load
transfer; loads forces); multistory buildings; reinforced concrete;
reinforcing steels; static loads; strains; stresses; temperature
Abstract:The long-term movements of in-situ reinforced concrete columns in two structures are reported through the construction stage to occupancy and subsequently in service. The columns were extensively instrumented to measure strains, temperature and moisture changes; in addition, a stress meter was incorporated in the second structure at the base of an internal column to relate the field movements and their effects to the load actually carried by the column. The results show that the inelastic movements in concrete cause a gradual load transfer to the steel reinforcement. In one structure steel stresses in excess of the permissible design values were noted. The assumed design dead load components of the working loads were realized in the lower columns of the structure but not in the upper storeys. After nearly five years in service, the concrete in the columns of the second structure were found to carry loads varying from 50% to 80% of the measured load carried by the columns. It is shown that a major proportion of the loads carried by the columns result from dead loads and that only about 10%-20% of the total design loads constitute imposed loads.
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