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Welcome to my presentation . Here you will find conceptual theory about T beam by Ultimate strength design . If any query , you can ask . Thank you .

Welcome to my presentation . Here you will find conceptual theory about T beam by Ultimate strength design . If any query , you can ask . Thank you .

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- 1. AHSANULLAH UNIVERSITY OF SCIENCE & TECHNOLOGY DEPARTMENT OF CIVIL ENGINEERING CE-416 PRE-STRESSED CONCRETE LAB SESSIONAL PRESENTED BY: S. M. RAHAT RAHMAN ID NO:10.01.03.044 COURSE TEACHERS: MUNSHI GALIB MUKTADIR SABREENA NASRIN 12/3/2013 1
- 2. T BEAM DESIGN : SINGLY & DOUBLY : USD 12/3/2013 2
- 3. CONTENTS 12/3/2013 3
- 4. Assuming tensile failure condition Additional strength of steel after yielding ACI code emphasizes this method. 12/3/2013 4
- 5. Concrete beams are often casted integrally with the slab and formed a “T” – shaped beam. These beams are very efficient . Here slab portion carries the compressive load and web portion carries the tension . 12/3/2013 5
- 6. Occurrence and Configuration of T-Beams • Common construction type • The slab forms the beam flange, while the part of the beam projecting below the slab forms is what is called web or stem. 12/3/2013 6
- 7. Compression Zone Tension Zone Figure : Singly Reinforced Beam for positive moment condition 12/3/2013 7
- 8. Compression Zone Tension Zone Figure : Doubly Reinforced Beam for positive moment condition 12/3/2013 8
- 9. 12/3/2013 9
- 10. T-Action Rectangular 12/3/2013 10
- 11. T Versus Rectangular Sections When T-shaped sections are subjected to negative bending moments, the flange is located in the tension zone. On the other hand, when sections are subjected to positive bending moments, the flange is located in the compression zone and the section is treated as a Tsection. 12/3/2013 11
- 12. From ACI 318, Section 8.10.2 Effective Flange Width : Condition 1 For symmetrical T-Beam or having slab on both sides a) 16 hf + bw b) Span/4 c) c/c distance 12/3/2013 12
- 13. From ACI 318, Section 8.10.2 Effective Flange Width : Condition 2 Beams having slabs on one side only a) bw + span/12 b) bw + 6hf c) bw + 1/2 * beam clear distance 12/3/2013 13
- 14. From ACI 318, Section 8.10.2 Effective Flange Width : Condition 3 Isolated T Beam a) beff ≤ 4 bw b) hf ≥ bw/2 12/3/2013 14
- 15. 12/3/2013 15
- 16. Case 1 : (N. A. is with in Flange) hf Strain Diagram Stress Diagram 12/3/2013 16
- 17. Case 2 : (N. A. is with in Web) 12/3/2013 17
- 18. ANALYSIS OF T-BEAM Analysis of T-Beams - ( a > hf) Consider the total section in two parts: 1) Flange overhangs and corresponding steel; 2) Stem and corresponding steel; b - bw N.A. bw N.A. 12/3/2013
- 19. ANALYSIS OF T BEAM Case-1 0.85 fc’ (b-bw) hf = As2 fy Where, As1 = As – Asf As2 = Asf Case-2 0.85 fc’ bw a = As1 fy 0.85 fc’ bw a + 0.85 fc’ (b-bw) hf = As fy 12/3/2013 19
- 20. T BEAM MOMENT CALCULATION b εc=0.003 0.85fc’ a/2 hf C c For : a hf d d-a/2 As T Strain Diagram bw Mn M n1 M n2 Stress Diagram M n1 M n2 As Asf f y d Asf f y d hf 2 a 2 12/3/2013 20
- 21. THANK YOU 12/3/2013 21
- 22. ANY QUESTION ? 12/3/2013 22

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