Design Of Seismic Retrofitting Of Reinforced
Concrete Structures
Author(s)
S. Dritsos
Abstract
As knowledge increases and buildings in seismic regions are designed with
higher degrees of safety, it becomes clear that older structures may require
upgrading. In general, codes or regulations to aid the engineer in this field do
not exist. At the present moment in Greece and with regard to reinforced
concrete structures, there is a considerable effort being placed into making up
this shortfall. As part of this effort, this paper concentrates on the latest design
procedures for strengthened reinforced concrete composite elements.
Modern seismic design of existing structures is moving towards a
displacement capacity assessment of the structure. For monolithic elements,
curves and formulas exist to evaluate the values for the yield strength and for the
displacements at both the yield stage and at the failure stage. No information
exists for the corresponding values for a strengthened element. By applying
suitable corrective factors to a monolithic element the capacity curve of a
strengthened element can be converted to the corresponding field of monolithic
design.
This paper defines the required correction factors and presents experimental
results from different strengthening methods used to construct concrete jackets.
The experimental results are then used to propose preliminary design values for
the required correction factors. Equations for use with the correction factors are
also described. Finally, the correction factors are compared with those provided
in the relevant codes. Although based on a limited database of experimental
results, it has been found that the monolithic behaviour coefficients do not
always correspond to the relevant values proposed in design codes.
Keywords: repair, strengthening, retrofitting, design, reinforced concrete, jacket
and column.
Keywords
repair, strengthening, retrofitting, design, reinforced concrete, jacket
and column.
Related Book
Other papers in this volume
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