Download hyperstatic.pdf PDF

Titlehyperstatic.pdf
TagsMathematics Nature Structural Engineering Prestressed Concrete
File Size695.0 KB
Total Pages18
Document Text Contents
Page 1

Obtaining hyperstatic (or secondary)
forces for bridge object

superstructures - test problem

Page 2

Geometry

Elevation
(Schematically, Not To Scale)

Section A-A
(Schematically, Not To Scale)

15m 15m

Neutral Axis

Tendon
F = 500kN before losses
F ~ 495.2 kN after losses
(elastic shortening loss only)

A

A

1.
52

5m
1.

3m

0.
65

11
m

0.
87

61
m

Page 9

Hyperstatic (Secondary) Forces
Only - 3 approaches

Page 10

Hyperstatic Forces
Approach 1 - via hyperstatic load

case
This approach may not be always reliable when
substructure is modeled.

Page 17

Define dummy flexural design request for the load combination containing
only the prestress load case

Page 18

The demand moments for this design request are obtained as a net resultant of forces
(in concrete and tendons) acting on the cross-section, which matches the definition of
the hyperstatic moment.

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