Abstract
In this study, a three dimensional finite element analysis was utilized to study the behavior of reinforced concrete T-
 girders with and without web openings under pure torsion by using
 ANSYS
 APDL
 15.0 program.
 Fourteen
 reinforce concrete T
 -
 girders were ana
 lyzed; one of the
 girders (without web openings)
 was
 modeled as a control girder. The analysis variables
 considered for the other girders are: size, shape, position
 of web openings
 , number of web
 openings and the method
 was
 used to strengthen the member at
 openings, (using internal
 deformed steel bars as in the case where the openings are planned before casting the girders).
 To
 study the general
 behavior of
 finite element models,
 torque
 -
 angle
 of twist plots at the end of the
 span near the loaded arms were r
 epresented.
 From this
 relation
 , it was
 showed a de
 c
 reasing in
 the strength of the T
 -
 girders with web openings under the torsional loads and increasing of the
 angle of twist
 .
 The
 results were analyzed in terms of torque twist characteristics; ultimate torque,
 crack patterns,
 crack width,
 warping
 and
 stresses.
 These terms were presented and a comparison
 between the finite element results was made.
 Keywords
 :
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