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Welcome to the presentation on “T Beam Design: Singly & Doubly by USD method” Presented By -

S. M. Rahat Rahman

ID: 10.01.03.104

1.Contents :

USD (Ultimate Strength Design Method)

T-beam

T - Beam acts Like Singly Reinforced Beam

T – Action vs rectangular Action

Effective Flange width of t-beam

Strength analysis

Nominal moment for t section

2. USD : Based on the ultimate strength of the structure member assuming a failure condition , due to concrete crushing or yielding of steel. Although there is additional strength of steel after yielding (strain hardening zone) which will not be considered in the design.

Actual loads are multiplied by load factor to obtain the ultimate design loads. ACI code emphasizes this method.

3. T Beam : For monolithically casted slabs, a part of a slab act as a part of beam to resist longitudinal compressive force in the moment zone and form a T-Section. This section form the shape of a "T“ . It can resist the longitudinal compression

4. 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.

5. Singly Reinforced Reinforcement is provided in tension zone only

6. Doubly Reinforced > Concrete can not develop the required compressive force to resist the maximum bending moment

> Reinforcement is provided in both compression and tension zone.

7. T-Beam Act As a Singly Reinforced Beam

8. Continuous T Beam :

When T-shaped sections are subjected to negative bending moments, the flange is located in the tension zone. Since concrete strength in tension is usually neglected in strength design, the sections are treated as rectangular sections.

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 T-section.

9. Effective Flange Width

10. Strength analysis of T beam

11. Analysis of T beam

12. T Beam moment calculation

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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 11/29/2013 1
- 2. T BEAM DESIGN : SINGLY & DOUBLY : USD 11/29/2013 2
- 3. CONTENTS 11/29/2013 3
- 4. Assuming tensile failure condition Additional strength of steel after yielding ACI code emphasizes this method. 11/29/2013 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 . 11/29/2013 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. 11/29/2013 6
- 7. Compression Zone Tension Zone Figure : Singly Reinforced Beam for positive moment condition 11/29/2013 7
- 8. Compression Zone Tension Zone Figure : Doubly Reinforced Beam for positive moment condition 11/29/2013 8
- 9. 11/29/2013 9
- 10. T-Action Rectangular 11/29/2013 10
- 11. T Versus Rectangular Sections When T-shaped sections are subjected to negative bending moments, the flange is located in the tension zone. Since concrete strength in tension is usually neglected in strength design, the sections are treated as rectangular sections. 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. 11/29/2013 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 11/29/2013 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 11/29/2013 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 11/29/2013 14
- 15. 11/29/2013 15
- 16. Case 1 : (N. A. is with in Flange) hf Strain Diagram Stress Diagram 11/29/2013 16
- 17. Case 2 : (N. A. is with in Web) 11/29/2013 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; 11/29/2013
- 19. T BEAM MOMENT CALCULATION εc=0.003 0.85fc’ a/2 hf C c For : a hf d d-a/2 As T Strain Diagram Mn M n1 M n2 Stress Diagram M n1 M n2 As Asf f y d Asf f y d hf 2 a 2 11/29/2013 19
- 20. T BEAM MOMENT CALCULATION Part-1 0.85 fc’ bw a = As1 fy Where, As1 = As – Asf As2 = Asf Part-2 0.85 fc’ (b-bw) hf = As2 fy 0.85 fc’ bw a + 0.85 fc’ (b-bw) hf = As fy 11/29/2013 20
- 21. Thank you 11/29/2013 21
- 22. ANY QUESTION ? 11/29/2013 22

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