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Civil Engineering Association eBooks Journals, Papers and Presentations EFFECT OF COLUMN CAPACITY DESIGN ON EARTHQUAKE RESPONSE OF REINFORCED CONCRETE BUILD

EFFECT OF COLUMN CAPACITY DESIGN ON EARTHQUAKE RESPONSE OF REINFORCED CONCRETE BUILD
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07-15-2011, 10:40 AM

EFFECT OF COLUMN CAPACITY DESIGN ON EARTHQUAKE RESPONSE OF REINFORCED CONCRETE BUILDINGS

Author: T. B. PANAGIOTAKOS and M. N. FARDIS | Size: 7.59 MB | Format: PDF | Publisher: Journal of Earthquake Engineering | Year: 1997 | pages: 33

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Journal of Earthquake Engineering Vol. 2, No. 1 (1998) 113-145
@ Imperial College Press

EFFECT OF COLUMN CAPACITY DESIGN ON EARTHQUAKE F&ESPONSE OF REINFORCED CONCRETE BUILDINGS

T. B. PANAGIOTAKOS and M. N. FARDIS
University of Patms, Department of Civil Engineering,
P. 0. Box 1424, 26500 P a t w , Greece

Received 20 February 1997
Revised 18 April 1997
Accepted 28 April 1997

Abstract:

In earthquake resistant design of RC frame buildings, capacity design of columns in flexure
is appIied to eliminate the possibiIity of storey sway mechanisms and to spread the
inelastic deformation demands and energy dissipation throughout the structure. The
paper considers two alternative column capacity designs: the conventional, full capacity
design of columns relative to the beams, and the relaxed one allowed by Eurocode 8 depending
on how much the seismic action controIs the flexural capacity of beams. Twelve
RC frame buildings, designed in detail according to the two capacity design alternatives,
are nonlinearly analysed under spectrum-compatible motions applied separately in the
two horizontal directions and scaled to intensity from once to twice the design ground
motion. In both design versions the slab participation to the beam tension flange is
considered either as in the design calculations - including those of capacity design -
i.e. very little, or as expected in reality, i.e. very significant. In most cases the dynamic
response to the design-level motion is found to be nearly elastic, due to the overstrength
of materials and members and to the "understress" of the structure due to crackinginduced
softening. At higher motion intensities the effect of column capacity design and
of the slab participation to the beam flexural capacity is not dramatic: column inelasticity
and some light damage cannot be prevented by relaxed or full capacity design, while
the large participation of the slab to the beam negative moment capacity does not overly
distort the strength balance between beams and columns or the seismic response of the
structure. Under any circumstances, column plastic hinging does not lead to a storey
sway mechanism.

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