C17_Lecture01_PG.pdf

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Prestressed concrete –
an idea
Piotr Gwoździewicz
Politechnika Krakowska
Kraków (Cracow)
Instytut Materiałów i Konstrukcji Budowlanych
Project “The development of the didactic potential of Cracow University of Technology in the range of modern
construction” is co-financed by the European Union within the confines of the European Social Fund
and realized under surveillance of Ministry of Science and Higher Education.
Concrete structures
New
Old
Project “The development of the didactic potential of Cracow University of Technology in the range of modern
construction” is co-financed by the European Union within the confines of the European Social Fund
and realized under surveillance of Ministry of Science and Higher Education.
Concrete structures
History of concrete structures was started in
the middle of the XIX century
In1848 Joseph Louis Lambot
In 1867 Joseph Monnier
Project “The development of the didactic potential of Cracow University of Technology in the range of modern
construction” is co-financed by the European Union within the confines of the European Social Fund
and realized under surveillance of Ministry of Science and Higher Education.
Concrete structures – weaknesses:
Loads provoking tension locally
Cracking
d)
ε σ
Deflection
Weight
e)
ε σ
Span limitation
Durability limitation
f)
Solution --- prestress
ε
σ
a)
ε
σ
Rysy
ε
σ
b)
c)
ε
σ
Project “The development of the didactic potential of Cracow University of Technology in the range of modern
construction” is co-financed by the European Union within the confines of the European Social Fund
and realized under surveillance of Ministry of Science and Higher Education.
Prestressed concrete structures
Prestressing – carefully planned
and controlled introduction
of permament forces
into a structural element,
aimed to create opposite action
to unfavourable stresses and deformations
provoked by external loads
Project “The development of the didactic potential of Cracow University of Technology in the range of modern
construction” is co-financed by the European Union within the confines of the European Social Fund
and realized under surveillance of Ministry of Science and Higher Education.

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