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Note for Prestressed Concrete Structures - PCS By Riyaz Pasha

  • Prestressed Concrete Structures - PCS
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PRESTRESSED CONCRETE STRUCTURES (PCS) COURSE CODE:CODE:-A80150 REGULATION:REGULATION:-R15 (JNTUH) B.TECH IVIV-YEAR IIII-SEM PREPARED BY:BY:-RIYAZ MOHAMMED CIVIL ENGINEERING

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PRESTRESSED CONCRETE STRUCTURES SYLLABUS UNIT-I INTRODUCTION, METHODS & SYSTEMS OF PRESTRESSING Introduction-Historic Development-General Principles of Pre stressing- Advantages & limitations of Pre stressed Concrete-Classification & Types of Pre stressing-Materials-High Strength Concrete & High Tensile Steel their Characteristics-Methods & Systems of Pre stressing: Pre tensioning & Post tensioning Methods & Systems of Pre stressing like Hoyer System, Magnel Blaton System, Freyssinet System, Gifford- Udall System & Lee McCall System. UNIT-II LOSSES OF PRE-STRESS Losses of Pre stress: Loss of Pre stress in Pre tensioned & Post-tensioned Members due to Various Causes like Elastic Shortage of Concrete, Shrinkage of Concrete, Creep of Concrete, Relaxation of Stress in Steel, Slip in Anchorage, Frictional Losses. UNIT-III FLEXURE & SHEAR Flexure: Analysis of Sections for Flexure-Beams Pre stressed with Straight, Concentric, Eccentric, Bent & Parabolic Tendons-Stress Diagrams-Elastic Design of PSC Beams of Rectangular & I Sections-Kern Line-Cable Profile & Cable Layout. Shear: General Considerations- Principal Tension & Compression- Improving Shear Resistance of Concrete by Horizontal & Vertical Pre stressing & by Using Inclined or Parabolic Cables-Analysis of Rectangular & I Beams for Shear-Design of Shear Reinforcements-Bureau of Indian Standards (BIS) Code Provisions. UNIT-IV TRANSFER OF PRE-STRESS IN PRE-TENSIONED MEMBERS Transfer of Pre stress in Pre tensioned Members : Transmission of Pre stressing Force by Bond-Transmission Length-Flexural Bond Stresses-IS Code Provisions-Anchorage Zone Stresses in Post tensioned Members-Stress Distribution in End Block-Analysis by Guyon, Magnel, Zielinski & Rowe’s Methods-Anchorage Zone Reinforcement-BIS Provisions. UNIT-V COMPOSITE BEAMS & DEFLECTIONS Composite Beams: Different Types-Propped & Un propped-Stress Distribution- Differential Shrinkage-Analysis of Composite Beams-General Design Considerations. Deflections: Importance of Control of Deflections-Factors Influencing Deflections-Short term Deflections of Un cracked Beams-Prediction of Long Time Deflections-BIS Code Requirements. ****** RIYAZ MOHAMMED Page i

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PRESTRESSED CONCRETE STRUCTURES CONTENTS (THEORY) UNIT-I INTRODUCTION, METHODS & SYSTEMS OF PRESTRESSING 1.1 Terminology...................................................................................................................1 1.2 Pre-stressed Concrete-Historical Development, Advantages & Limitations.......1 1.3 Pre-stressing-Principles, Methods, Classification & Types ……………........4 1.4 Materials..................................................................................................7 1.5 Systems of Pre-stressing like Hoyer system, Magnel Blaton system, Freyssinet system, Gifford-Udall system & Lee McCall system........................8 1.6 Characteristics of High Strength Concrete & High Tensile Steel....................12 UNIT-II 2.1 LOSSES OF PRE-STRESS Loss of Pre-stress in Pre-tensioned & Post-tensioned Members ......................... 14 UNIT-III FLEXURE & SHEAR 3.1 Terminology......17 3.2 Analysis of Sections for Flexure.........................17 3.3 Elastic Design of PSC Beams of Rectangular & I Sections.......18 3.4 Design of Shear Reinforcements...........18 3.5 Load Balancing Concept.......................19 UNIT-IV TRANSFER OF PRE-STRESS IN PRE-TENSIONED MEMBERS 4.1 Transmission of Pre stressing Force by Bond..........................21 4.2 Transmission Length.............................23 4.3 Flexural Bond Stresses..............................23 4.4 Stress Distribution in End Block...................24 4.5 Analysis by Guyon, Magnel, Zielinski & Rowe’s methods...........................25 4.6 Anchorage Zone Reinforcement................30 UNIT-V COMPOSITE BEAMS & DEFLECTIONS 5.1 Composite Beams: Different Types- Propped & Un propped.......................33 5.2 Stress Distribution in Composite Beams...................................34 5.3 General Design Considerations of Composite Beams..................35 5.4 Differential Shrinkage...................38 5.5 Deflections-Factors & Importance..........................38 5.6 Short Term Deflections of Un cracked Beams....................41 5.7 Prediction of Long Time Deflections..........................47 RIYAZ MOHAMMED Page ii

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PRESTRESSED CONCRETE STRUCTURES 5.8 BIS Code Requirements of Deflections..............48 ****** RIYAZ MOHAMMED Page iii

Lecture Notes