STRUT AND TIE MODEL FOR DEEP BEAM DESIGN

A lthough the Strut and Tie
Method (STM) has been used
for several years in Europe1,2 and
has been included in the Canadian
Standard for the Design of Concrete
Structures3 since 1984 and the
AASHTO LRFD Bridge Specifications4
since 1994, it is a new concept
for many structural engineers in the
U.S. Procedures and recommendations
for the use of STM to design
reinforced concrete members were
discussed in a State-of-the-Art
Report from Joint ACI-ASCE Committee
445, Shear and Torsion,5 but
specific code requirements were not
incorporated into the ACI Building
Code until the 2002 edition,6 as
Appendix A. To help U.S. engineers
improve their ability to use STM for
analysis and design of concrete
members, Joint ACI-ASCE Committee
445 and ACI Committee 318-E,
Shear and Torsion, recently completed
a publication that contains a variety
of STM examples.7 The STM model
used here for the analysis and
design of a deep beam is not unique.
It should be noted that the STM
procedure in Appendix A of the ACI
Building Code (referred to as the
Code) is a strength limit-state design
approach. Serviceability limit-states
(for example, deflections and
reinforcement distribution) defined
in the main body of the Code must
also be checked.
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DESIGN of REINFORCED CONCRETE DEEP BEAMS Download File