8/6/2019 T Beam Poster Concrete Project

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Amir Aghajani, Felipe Arreola, Trina Alaniz, Abraham Flores, and Jorge AAmir Aghajani, Felipe Arreola, Trina Alaniz, Abraham Flores, and Jorge A

Tito Ph.D. P.E.Tito Ph.D. P.E.ABSTRACTABSTRACT

INTRODUCTIONINTRODUCTION

METHODSMETHODS CONCLUSIONCONCLUSION

ACKNOWLEDGEMENTSACKNOWLEDGEMENTS

Design, Construction, and Testing of a LightweightDesign, Construction, and Testing of a Lightweight

Reinforced Concrete T-BeamReinforced Concrete T-Beam

CRACKING MAPCRACKING MAP

Students of ET 4325 Fall 2010

Alberto Gomez-Rivas Ph.Ds. P.E. George Pincus Ph.D. P.E. The Department of Engineering

Technology The Scholars Academy Felipe Arreola Sr. Oates Industries Inc. Texas Industries Inc. Flexicore Inc.

The objective of this project was to design,construct, and test a lightweight reinforcedconcrete T-Beam, which was 24-ft in lengthand reinforced with 1#10 rebar, closedstirrups spaced 9 apart, and 3#3 rebar inthe flanges. The design was done using thetheory of Reinforced Concrete and the ACI-318-08 norm. The lightweight concrete hada strength, fc, of 8 ksi that is consideredhigh strength concrete.A 24-ft T-Beam was designed to permit itstest in the Laboratory of Structures. The T-Beam was constructed by the students ofSenior Concrete Design using the facilities ofthe new structural testing laboratory. All

theoretical assumptions were verified beforeand during the construction. A loading rigwas used to test the beam with a 2-pointdistributed central load. The results of thelaboratory test met the theoreticalcalculations.

All design calculations complied ACI318-08 requirements. A spreadsheet isused to perform the calculations ofstrength and deflections.A wooden form was built to permitpouring of the beam. The natural frequency was obtainedexperimentally using an accelerometerand this result was useful to verify thetheoretical stiffness of the T-Beam.A 2-point steel load distribution beamwas designed and constructed to permitthe test.

Using lightweight concrete the total weightof the beam was 1410 lbs., which isapproximately 20% less than a beam withnormal weight concrete. The theoretical yielding moment capacityof the beam was 118 kip-ft whichtranslates to 23 kips load from the jack.During testing the beam was loaded pastyielding state showing a ductile behavior,as estimated. The beam resisted, at the point ofincremental unloading, 124 kip-ft or 24kips load from the jack. A maximum of 3deflection at center was observed at 24

kips. The reinforcing steel began yielding afterthe applied load surpassed 22 kips. Thestrain hardening of the steel induced thepermanent deformation observed after thebeam was completely unloaded.Deflections and capacity results agreedvery well with theoretical predictions,concluding that a beam using high strengthlightweight concrete may be predictable.

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0 0 .5 1 1.5 2 2.5 3 3.5

LOADJACK(lbs)

DEFLECTION

LOA D vs. DEFLE

Theoretical BehBeam 2-Lab Test-Survey Le

Natural frequency, f n =17 Hz

Natural Period, T = 1/fn= 0.06 sec

Pmax = 24kDmax ~ 3