Unit III deflection and design of anchorage zone
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Factors influencing deflections – Short term deflections of uncracked members – Prediction of long term deflections due to creep and shrinkage – Check for serviceability limit state of deflection. Determination of anchorage zone stresses in post-tensioned beams by Magnel’s method, Guyon’s method and IS1343 code – design of anchorage zone reinforcement – Check for transfer bond length in pre-tensioned beams.
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This document discusses beams and beam loading. It defines beams and describes different types of beams including cantilever, simply supported, overhanging, fixed, continuous, and propped cantilever beams. It also discusses beam supports, describing roller, pinned, fixed, and simple supports. Additionally, it covers loads on beams, identifying point loads, distributed loads, and coupled loads. Structures and beams can be either statically determinate or statically indeterminate, and the differences between these two types are explained.
Design and Detailing of RC Deep beams as per IS 456-2000
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1. DEEP BEAM DEFINITION - IS 456
2. DEEP BEAM APPLICATION
3. DEEP BEAM TYPES
4. BEHAVIOUR OF DEEP BEAMS
5. LEVER ARM
6. COMPRESSIVE FORCE PATH CONCEPT
7. ARCH AND TIE ACTION
8. DEEP BEAM BEHAVIOUR AT ULTIMATE LIMIT STATE
9. REBAR DETAILING
10. EXAMPLE 1 – SIMPLY SUPPORTED DEEP BEAM
11. EXAMPLE 2 – SIMPLY SUPPORTED DEEP BEAM; M20, FE415
12. EXAMPLE 3: FIXED ENDS AND CONTINUOUS DEEP BEAM
13. EXAMPLE 4 : FIXED ENDS AND CONTINUOUS DEEP BEAM
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This document discusses bending moment stress, including uniaxial and biaxial bending stress. It defines bending as causing deflection from a straight line, and bending moment as a measure of bending force applied at a distance from a beam's neutral axis. Bending moment stress induces tension or compression in a bent body. Examples show calculations for uniaxial 3-point and 4-point bending stresses, as well as an example of biaxial bending stress distribution and the line of zero stress in a loaded block.
Sheartest
This document describes procedures for direct shear testing to determine a material's shear strength. Direct shear testing aims to simulate uniform shear stress across a specimen's cross-section by applying shear forces over small lengths to minimize bending. There are two types of direct shear tests: single shear tests shear across a single surface, while double shear tests shear across two surfaces. The test procedure involves fixing a cylindrical specimen in a shear tool and applying a compressive or tensile load until fracture, then calculating the shear strength from the maximum load and specimen's cross-sectional area.
Shear Forces
Shear forces act perpendicular to the longitudinal axis of a beam and can cause shear failure if the shear resistance is insufficient. Shear failure occurs when a material is pushed in different directions, potentially causing cracks or excessive deflection. It can happen due to issues like incorrect design assumptions, weak concrete strength, or misplaced steel reinforcement. To prevent shear failure, engineers must properly design shear reinforcement, using strong concrete and ensuring adequate and properly placed reinforcing rods.
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Unit III deflection and design of anchorage zone
- 1. UNIT III DEFLECTION AND DESIGN OF ANCHORAGE ZONE Mr.P.SELVAKUMAR Assistant Professor Department of Civil Engineering Knowledge Institute of Technology, Salem
- 2. Stress distribution in end block • The curvature of the struts being convex towards the centre line of the block, induces compressive stresses in zone A.
- 3. • In zone B the curvature is reversed in direction and struts tends to deflects outwards, separating from each other and consequently developing transverse tensile stresses. • In zone C the struts are straight and parallel so that no transverse stresses are induced only longitudinal stresses develop the zone.
- 4. • The idealised stress distribution in end block with the compressive and tensile stress path is shown below. • The bursting tension in the direction perpendicular to anchorage force
- 6. Thank You KIOT, SALEM / CIVIL ENGINEERING