About pre-stresed concrete : way to overcome concrete weakness in tension. Generally, the concrete undergoes compression on top flange and tension at bottom flange. In pre-stressing the tendons are stretched along the axis and cement is poured, later when the tendons are released the compression is generated at the bottom which tries to counter-balance the compression due to loading at the top part of the beam. The upward force along the length of the beam counteracts the service loads applied to the member. The unique characteristics of pre-stressed concrete allow predetermined, engineering stresses to be placed in members to counteract stresses that occur when the unit is subjected to service loads.
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More About Prestressed concrete :
Prestressed concrete is a form of concrete used in construction that while under construction is substantially “prestressed” (compressed) in the areas that will be subjected to tensile forces while in service to strengthen it against these forces.
way to overcome concrete weakness in tension. Generally, the concrete undergoes compression on top flange and tension at bottom flange. In pre-stressing the tendons are stretched along the axis and cement is poured, later when the tendons are released the compression is generated at the bottom which tries to counter-balance the compression due to loading at the top part of the beam. The upward force along the length of the beam counteracts the service loads applied to the member. The unique characteristics of pre-stressed concrete allow predetermined, engineering stresses to be placed in members to counteract stresses that occur when the unit is subjected to service loads.
This compression is produced by the tensioning of high-strength “tendons” located within or adjacent to the concrete volume and is done to improve the performance of the concrete in service. Tendons may consist of single wires, multi-wire strands or threaded bars that are most commonly made from high-tensile steels, carbon fiberor aramid fiber.:52–59 The essence of prestressed concrete is that once the initial compression has been applied, the resulting material has the characteristics of high-strength concrete when subject to any subsequent compression forces and of ductile high-strength steel when subject to tension forces. This can result in improved structural capacity and/or serviceability compared with conventionallyreinforced concrete in many situations.:6In a prestressed concrete member, the internal stresses are introduced in a planned manner so that the stresses resulting from the superimposed loads are counteracted to the desired degree.
Prestressed concrete is used in a wide range of building and civil structures where its improved performance can allow for longer spans, reduced structural thicknesses, and material savings compared with simple reinforced concrete. Typical applications include high-rise buildings, residential slabs, foundation systems, bridgeand dam structures, silos and tanks, industrial pavements and nuclear containment structures.
First used in the late-nineteenth century, prestressed concrete has developed beyond pre-tensioning to include post-tensioning, which occurs after the concrete is cast. Tensioning systems may be classed as either monostrand, where each tendon’s strand or wire is stressed individually, or multi-strand, where all strands or wires in a tendon are stressed simultaneously. Tendons may be located either within the concrete volume (internal prestressing) or wholly outside of it (external prestressing). While pre-tensioned concrete uses tendons directly bonded to the concrete, post-tensioned concrete can use either bonded or unbonded tendons.
The Bamu syllabus contains:
Unit- I (6)
a) Prestressed concrete structures, introduction, basic concepts, requirement of various
materials and need of high strength concrete, steel for it, systems of prestressing i.e. pre
and post tensioning etc., various methods of prestressing (Hoyer’s method, Freyssinet
method, Magnel Bloten method)
b) Losses in Prestressing
Unit – II (8)
a) Analysis of prestressed concrete beams – rectangular, symmetrical and unsymmetrical
b) Concept of cable profiles, kern point, pressure line and thrust line etc.
Unit – III (6)
Design of anchor blocks by Magnel’s, Guyon’s method and Indian Standard method
Unit – IV (10)
a) Flexural strength of prestressed concrete section, shear strength of prestressed concrete
b) Design of prestressed concrete beams
Unit – V (6)
a) Analysis of composite section
b) Design of one way and two way slab
Unit – VI (4)
a) Concept of circular prestressing, design of non-cylindrical pipes
b) Design of prestressed concrete poles
Note: IS: 1343 is allowed in the theory examination
1) Prestressed concrete by N.Krishna Raju
2) Design of prestressed structures by T.Y.Lin
3) Prestressed Concrete by S. Ramamrutham
4) I.S. 784 for reference for circular prestressing
Pattern of Question Paper:
The charts for design of anchor blocks shall be made available in the question paper
The units in the syllabus shall be divided in two equal sections. Question paper shall be set
having two sections A and B. Section A questions shall be set on first three units (1,2,3) and
Section B questions on remaining three units (4,5,6) . Question paper should cover the
For 80 marks Paper:
1. Minimum ten questions
2. Five questions in each section
3. Three questions from each section are asked to solve.
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