Torsion Design
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TORSION & SHEAR ( ACI - 95 ) Section Type R L - Lbeam T - T beam R - Rectangular be Ledge 0 1 yes 0 no B 9 in f'c 2.5 ksi D 30 in fy 60 ksi fvy 36 ksi Bf 0 in (Irrelevant) Df 0 in (Irrelevant) Clear Cvr 1.5 in Stirrup N 3 assumed bl 0 in Irrelevant Eff. Cvr. 3 in dl 0 in Irrelevant d 27 in At critical section Vu 44 k 59.8 Tu 6.78 k-ft 45.9 Check torsional requirement 3.31 k-ft < 6.78 k-ft Torsion to be considered Req'd Area of stirrups for torsion At/s 0.0104 in2/in/leg Check shear requirement 20.66 k < 44 k Shear to be considered Req'd Area of stirrups for shear Av/s 0.0283 in2/in/2legs Combined shear & torsion stirrup requirements (At + Av/2)/s 0.0246 in2/in/leg 0.0063 in2/in/leg (At + Av/2)/s 0.0246 in2/in/leg Try No. 3 Ab 0.110 Req'd spacing 4.49 in Maximum spacing 8.0625 in Use 3 s ( min. 4 in s ( max.) 8 in fTcr/4 fVc {(At + Av/2)/s} min in 2
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RC torsion
Transcript of Torsion Design
Sheet1TORSION & SHEAR( ACI - 95 )Section TypeRL - Lbeam T - T beam R - Rectangular beamAcpLedge01 yes0 noRib2701270B9inf'c2.5ksiFlange000D30infy60ksiLedge000fvy36ksiAcp270in2Bf0in(Irrelevant)Df0in(Irrelevant)Clear Cvr.1.5inPcpStirrup No.3assumedbl0inIrrelevantEff. Cvr.3inRib78178dl0inIrrelevantd27inFlange-1800Ledge000At critical sectionPcp78inVu44k59.8Tu6.78k-ft45.9fTcr/43.31k-ftCounterC11C21Check torsional requirementStirrupDia0.375inArea0.1104in2fTcr/43.31k-ft0.227OKTuph/(1.7AohAoh)0.13762503640.0189406506Computation of Longitudional reinforcement[ Max. spacing ]12inA L ( required )0.40in2(1)[At/s]ph[fyv/fyl]0.4041470507A L ( minimum )0.72in25[f'c]1/2Acp/fy - (1)0.7208529493A L ( governing )0.72in2Select no. of bars per face4Total nos.8Ast / bar0.090in2Equiv. #2.7Assume No. of barTop2de2.00in.Spacing8.33in.
