CEES 3673 Concrete Design – I

 

Laboratory – performed by undergradudate students (with concrete donated by Dolese):

 

 

Monotonic flexural and direct shear tests of five, ~2/3 scale, reinforced concrete beams

 

(Also as part of a pilot study for OU research program of headed bar anchorage assessment)

 

 

 

1.      Beam specimen #1a – flexural testing of an over-reinforced beam  (tested 4/4/08)

 

Failure modes: brittle failure with no tension rebar yielding and with small deflection,

                       very large moment capacity, concrete crushing/comp. rebar buckling

 

   

 

 

 

      2.  Beam specimen #2a – flexural testing of a minimally-reinforced beam  (tested 4/11/08)

 

Failure modes: tension rebar yielding just after cracking, very low moment capacity,

    large deflection, eventually collapsed due to steel fracture (no more dowel / integrity)

 

 

 

 

 

      3.  Beam specimen #2b – shear testing of a minimally-reinforced beam  (tested 4/16/08)

 

Failure modes: diagonal comp. strut action, leading to higher gravity load capacity

 

 

 

      4.  Beam specimen #3 – flexural testing of an under-reinforced beam  (tested 4/18/08)

 

Failure modes: flexural failure, large deflection, excellent ductility

 

 

 

      5.  Beam specimen #1b – shear testing of an over-reinforced beam  (tested 4/21/08)

 

Failure modes: brittle shear failure, little deflection (no warning), dowel action