CVEN 4301
Advanced Concrete Structures
Prestressed Concrete Lecture 3
Professor Stephen Foster
Flexural Behaviour Post Cracking
Losses of Prestress
Cracking Moment
Flexural cracking occurs when the te
CVEN4301 Advanced Reinforced Concrete Design
Introduction to Time Effects
Introduction
sh
e
P
c
When concrete sets in time, it shrinks (as it loses water). The strain at a
time t due to shrinkage is
CVEN4301AdvancedConcreteStructures
PrestressedConcrete Lecture2
FlexuralBehaviourofUncrackedMembers
InitialStrains
Consider a section in a prestressed member that is
subjected to its self-weight + pre
Week 4 ProblemFor a prestressed concrete beam with a T cross-section shown in Figure below, calculate
Assume that prestress area is 1380mm2, the section has 2N32 reinforcement with
650
. effective pre
Question1
A prestressed concrete beam with a T cross-section shown in figure 1 has a span of 12 metres.
It is post-tensioned by a cable that has a cross-sectional area of 1000 mm2 and an eccentricity
Week 3 ProblemFor a prestressed concrete beam with a T cross-section shown in Figure below, calculate .
Assume:
1. There is no tensile reinforcement in the section
2. There are 2N32 bars in the sectio
Tutorial Problem
For the simply supported beam shown Below which spans 12m with dead load of 9 kN/m(SW) and live
load of 25 kN/m:
1. Determine the presstress needed to ensure that the section remains
Solved Example
Loss of Prestress
Question: The post-tensioned beam shown in Figure-1 is stressed by two tendons. Each
tendon contains eighteen 7 wire compacted strand and the diameter of each strand i
RECOMMENDED PRACTICE
Reinforcement Detailing Handbook
Errata:
The existing section 13.2.3 (a) and Figure 13.4 on page 13:4 should be replaced with:
(a) At all simple supports, a primary calculation is