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IBRACON Structures and Materials Journal • 2012 • vol. 5 • nº 2
R. M. F. CANHA |
G. M. CAMPOS |
M. K. EL DEBS
interfaces are proposed, contemplating the configuration of the
shear keys, the socket and the column base.
After analysis of the theoretical and experimental results, the fol-
lowing conclusions were drawn:
a) For a rough socket foundation to show a behavior similar to
that of a monolithic connection, it is necessary that the shear
keys dimensions be within the limits recommended in the pres-
ent work.
b) The design of the vertical reinforcement of rough sockets must
be based on the bending theory.
c) The horizontal reinforcement of the transverse walls should
be designed following the refined model by Canha et al. [10],
adjusting the values of
o
f
60
=b
and
o
r
35
=b
to better repre-
sent the experimental results.
d) The new model proposed for analysis of rough column base,
calibrated from the socket foundation, was found to present
less conservative longitudinal reinforcement compared to the
model proposed by Campos et al. [3] and adapted for rough
interfaces. The two models were found to provide minimum
transverse reinforcement.
It is worth highlighting that the models proposed in this work are
valid only for rough interface connections in which the embed-
ded length is determined by the Brazilian Standard Code NBR
9062:2006 [6] and for cases of high eccentricity, keeping in mind
that these models were based in experimental observations of
specimens within these situations.
5. Acknowledgements
The authors would like to acknowledge CAPES for the financial
support through scholarships for the Master’s degree of the first
author and Post-Doctorate of the second author, FAPESP for the
support for the thematic project “Nucleation and increment of re-
search, innovation, and diffusion in precast concrete and mixed
structures for the civil construction modernization” (proc. 05/53141-
4) and CNPq for productivity scholarship in research of the first and
third authors.
6. References
[01] CANHA, R.M.F.; EL DEBS, M.K. Critical analysis of
models and recommendations for designing
column-base connection by socket of precast concrete
structures. IBRACON Structural Journal, v.2, n.2,
p.116-136, June. 2006.
[02] CANHA, R.M.F.; EL DEBS, M.K. Proposal of design
model for column-base connection by socket of
precast concrete structures. IBRACON Structural
Journal, v.2, n.2, p.152-166, June. 2006.
[03] CAMPOS, G.M.; CANHA, R.M.F.; EL DEBS, M.K.
Design of precast columns bases embedded in socket
foundations with smooth interfaces. IBRACON
Structures and Materials Journal, v.4, n.2, p.314-323,
June. 2011.
[04] CANHA, R.M.F. Theoretical-experimental analysis of
column-foundation connection through socket of
precast concrete structures. São Carlos. 279p. PhD
Thesis. School of Engineering of São Carlos,
University of São Paulo, 2004.
[05] CAMPOS, G.M. Recommendations for the design of
socket foundations. São Carlos. 183p. MSc Thesis.
School of Engineering of São Carlos, University of São
Paulo, 2010.
[06] BRAZILIAN ASSOCIATION OF TECHNICAL
STANDARDS. NBR 9062 - Design and fabrication of
precast concrete structures. Rio de Janeiro, ABNT.
2006.
[07] RIZKALLA, S.H.; SERRETE, R.L.; HEUVEL, J.S.;
ATTIOGBE, E.K. Multiple shear key connections for
precast shear wall panels. PCI Journal, v.34, n.2,
p.104-120, Mar/Apr. 1989.
[08] LACOMBE, G.; POMMERET, M. Les joints structuraux
dans les constructions en grands panneaux
prefabriques. Annales de L’Institut Technique du
Batiment et dês Travaux Publics, n.314, p.114-144,
Fevrier. 1974.
[09] JAGUARIBE JR., K.B. Column-foundation connection
through socket of precast concrete structures with
reduced embedded length. São Carlos. 167p. MSc
Thesis. School of Engineering of São Carlos,
University of São Paulo, 2005.
[10] CANHA, R.M.F.; EBELING, E. B.; EL DEBS, A. L. H.
C; EL DEBS, M. K. Analysis of the behavior of
transverse walls of socket base connections.
Engineering Structures, v.31, n.3, p.788-798,
Mar. 2009.
[11] NUNES, V.C.P. Experimental analysis of socket
foundation emphasizing the internal forces in the
pedestal transverse walls. São Carlos. 132p. MSc
Thesis. School of Engineering of São Carlos,
University of São Paulo,, 2009.
[12] MELLO, C.E.E. (Ed.) MUNTE design handbook of
precast concrete. São Paulo: Pini, 2004.
[13] CONSIGLIO NAZIONALE DELLE RICERCHE.
CNR-10025 - Istruzioni per il progetto, l´esecuzione
ed il controllo delle strutture prefabbricate in
calcestruzzo. ITEC/La prefabricazione. Roma, 1998.
[14] EL DEBS, M.K. Precast concrete: bases and
applications. 1.ed. São Carlos, SP, Publicação
EESC-USP. 2000.
[15] LEONHARDT, F.; MÖNNIG, E. Vorlesungen uber
massivbau, Berlin:. Springer-Verlag, 1973.
(Portuguese version: Construções de concreto:
Princípios básicos sobre armação de estruturas de
concreto armado, Rio de Janeiro: Interciência, 1.ed,
v.3,. 1977.)
[16] EBELING, E. B. Analysis of precast columns base in
the connection with socket foundation. São Carlos.
103p. MSc Thesis. School of Engineering of São
Carlos, University of São Paulo, 2006.
[17] BRAZILIAN ASSOCIATION OF TECHNICAL
STANDARDS. NBR 6118 - Design of concrete
structures - Procedure. Rio de Janeiro, ABNT. 2007.