DESIGN OF PRE-STRESSED CONCRETE STRUCTURES (CCE)

SHE Level 4
SCQF Credit Points 20.00
ECTS Credit Points 10.00
Module Code MHH224605
Module Leader Andrew Maciver
School School of Computing, Engineering and Built Environment
Subject SCEBE - School Office
Trimesters
  • A (September start)
  • B (January start)

Summary of Content

The aim of this module is to provide a knowledge and understanding of the analysis and design of Pre-stressed concrete structural elements based on the current British standards specifications and hence to introduce to the topics contained. In this module, the structural analysis and structural design of Pre-stressed Concrete structural elements will be explained. The aim also include providing an insight into the importance of Pre-stressed concrete concept and hence Pre-stressed concrete structural elements behaviour and to understand the essential load carrying mechanism structural behaviour difference between Reinforced Concrete and Pre-stressed concrete elements. Further, this module will also discuss the durability aspects of how Pre-stressed concrete concept provide a safe, economical and durable structures under special situations like long span bridges, waffle slabs, nuclear power reactors, etc.,

Syllabus

The teaching syllabus will cover the following areas: Introduction to Pre-stressed Concrete Structures : Definition of Pre-stressed concrete, historical development, terminology of technical terms used in Pre-stressed concrete, applications of Pre-stressed concrete to civil engineering structures. M at erials used for pre-stressing: Need for use of high strength concrete and high strength steel, stress-strain relationships of high strength concrete and high strength steel, importance of creep and shrinkage strains. Pre-stressing Systems: Post-tensioning system and pretensioning systems of pre-stressing. Analysis of Pre-stressed concrete sections for flexure - Limit state of serviceability - Flexure- Basic assumptions, Analysis of stresses in Pre-stressed concrete beams due to various cable profiles, resultant stress distribution across a section due to axial and eccentric pre-stressing, pressure line/thrust line concept, concept of load balancing, assessment of factor of safety against cracking- Examples on analysis of Pre-stressed concrete beams for flexure. Losses of Pre-stress: Assessing various losses of stress encountered during pre-stressing, Loss of pre-stress due to friction, Loss of pre-stress due to creep and shrinkage, Loss of pre-stress due to elastic deformation of concrete, Loss of pre-stress due to anchorage slip, Loss of pre-stress during handling and erection - Examples on losses of pre-stresses - total loss of pre-stress in post tensioned and pre tensioned bems. Limit State of Serviceability - Deflection - Deflection in Pre-stressed concrete beams due to various cable profiles and imposed loads - Examples on deflection of Pre-stressed concrete beams. Limit State of Serviceability - Shear - Shear Stress distribution in Pre-stressed concrete sections due to various cable profiles.- Examples on shear stress distribution . Limit State of collapse - Flexure - Ultimate flexural strength of Pre-stressed concrete beams - [approximate method only] - Examples on ultimate flexural strength of Pre-stressed concrete beams. Limit State of collapse - Shear - Section un-cracked in flexure only- assessment of ultimate shear force, relation between cable profiles and shear force, principal stresses - Examples on shear. Anchorage zone stresses in post tensioned Pre-stressed concrete beams - End zone stresses, anchorage zone stresses due to axial pre-stressing and eccentric pre-stressing, design of end blocks - Anchorage zone reinforcement - Examples on anchorage zone stresses. Transfer of pre-stress in pre-tensioned members: Transmission of Pre-stressing Force by bond, Transmission length, Bond stresses, transverse tensile stresses, End-Zone reinforcement, Flexural Bond Stresses, BS;Code provisions for Bond and Transmission length Design of Pre-stressed concrete beams - statically determinate structures - Design of post tensioned and pre tensioned simply supported Pre-stressed concrete beams, preliminary section selection, selection of suitable cable profile, verifying the section suitability. Design for flexure, shear, bond and anchorage and limit state of serviceability deflection criteria - Design examples

Learning Outcomes

On completion of this module the student should be able to:- Understand, analyse, and apply the principles of Pre-stressed concrete structures in the design of statically determinate beams [A1,A2].-Ensure that structural behaviour in practice corresponds to the assumptions of the design model by appropriate detailing of the structure[C4]. -Design a selection of Pre-stressed concrete structural elements by the use of suitable mathematical analytical skills in the problem solving encountered in the design of structural elements [B4,B5]- Apply and enhance the level of theoretical knowledge to practical and discipline oriented tasks [C1, C2]-IT skills as applicable in solving the tasks related to the module[D3,D13]

Teaching / Learning Strategy

The main teaching method will be based on class room lectures using teaching aids like overhead projector slides and power point presentations. The students will be expected to perform directed reading and self-learning exercises and enhance their structural analysis and design capabilities. Tutorials will be used to reinforce the module material and to discuss the issues raised by the directed reading.

Indicative Reading

-360 1. Nilson H. Arthur " Design of Prestsressed Concrete", Second Edition, John Wiley & Sons, New York, 1987. 2. Krishnaraju ,N."Pre-stressed Concrete", Third Edition, Tata McGraw -Hill Publishing Company Limited, New Delhi, 1995. Ben C. Gerwick, Jr. " Consstruction of Pre-stressed Concrete Structures", Second Edition, John Wiley & Sons, Inc.,New York, 1993.

Transferrable Skills

provide: Problem Solving and Numeracy, analytical knowledge in applying the principles of mechanics, structural analysis and structural design of Pre-stressed concrete structures Course works provide :Communication, Critical analysis of design situations, problem solving skills.

Module Structure

Activity Total Hours
Lectures (FT) 56.00
Independent Learning (FT) 100.00
Tutorials (FT) 28.00
Assessment (FT) 16.00

Assessment Methods

Component Duration Weighting Threshold Description
Coursework 1 n/a 30.00 n/a Assigtnment is Module Based Design each student is assigned individual design task
Exam (School) 1.50 20.00 n/a Mid-term test - Unseen written 1½ Hours
Exam (Exams Office) 2.00 50.00 45% Final Examination - Unseen written - 2 Hours