RC Frame Structure Strengthening By Reason Of
Insufficient Concrete Strength
Author(s)
P. Stepanek, I. Lanikova & P. Simunek
Abstract
During the reconstruction of a university in Olomouc (Czech Republic) it was
discovered that the concrete used in one load-bearing structure was of
insufficient strength. The university building complex was constructed in the
years 1955–1960. It is built from a reinforced concrete skeleton. The four-storey
building is founded on RC footings and continuous footing. A detailed structural
investigation of the structure of the first floor determined that the strength of the
used concrete varied, ranging from concrete class C3/3.5 to C12/15. The original
designed concrete class was C10/13.5, while the plain reinforcement utilised
according to the original design was steel with a design strength of 180 MPa.
Three structural repair variants were designed based on construction surveys:
• steel bandages for the columns and girders, and strengthening/supporting
of the girders via steel cross-beams fitted to the bandages;
• steel bandages for the columns and girders, and strengthening of the
girders via prestressing tendons;
• additional non-prestressed reinforcement of the structure by covering it
with sprayed concrete.
Based on the economic (cost), structural and technical aspects (minimising of
additional load), the variant using bandages with additional external prestressing
of the majority of the girders via tendons was preferred.
Keywords: concrete, prestressing, bandage, frame, strengthening.
Keywords
Keywords: concrete, prestressing, bandage, frame, strengthening.
Related Book
Other papers in this volume
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