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Introduktion av spännbandbro

Al-Janabi, Taha LU (2012) VBK920 20121
Civil Engineering
Division of Structural Engingeering
Abstract
A stress ribbon bridge is a kind of suspension bridge, which finds its roots in a very old bridge type, namely the rope bridge. Compared to a rope bridge, the stress ribbon bridge has a reinforced concrete slab. This has bending rigidity and significant weight, which eliminates the flexibility that is typical of rope bridges and provides stability and rigidity such that the bridge also can be used for vehicular traffic.
The current report is an introduction to the bridge type. Its appearance, construction, production, use, typical dimensions, static and dynamic operation are briefly described. The principles, equations and criteria for a preliminary design are also given. Depending on the load type, deformations and stresses can be... (More)
A stress ribbon bridge is a kind of suspension bridge, which finds its roots in a very old bridge type, namely the rope bridge. Compared to a rope bridge, the stress ribbon bridge has a reinforced concrete slab. This has bending rigidity and significant weight, which eliminates the flexibility that is typical of rope bridges and provides stability and rigidity such that the bridge also can be used for vehicular traffic.
The current report is an introduction to the bridge type. Its appearance, construction, production, use, typical dimensions, static and dynamic operation are briefly described. The principles, equations and criteria for a preliminary design are also given. Depending on the load type, deformations and stresses can be calculated analytically or numerically
using the finite element method. Both methods are used in an example of preliminary design. Diagrams show how various design parameters can affect the function of a bridge with a span of 80 m. When designing a stress ribbon bridge there are different stages in construction and usage
time. This report takes into account five different stages:
- Stage 0: Installation of bearing cables with dead load of separated concrete segments.
- Stage 1: The concrete segments cast together, applying post-tension force and then assemble all the dead load from the non-structural parts.
-Stage 2: Official opening of the bridge. This means the introduction of live load and also temperature variation.
- Stage 31: Long-term effects add to the analysis of Stage 1.
- Stage 32: The final stage involves a modification of the quantities at Stage 2 and introducing the time-dependent effects.

The preliminary calculations in this report suggest that stress ribbon bridges may be of special interest for pedestrian and bicycle bridges with long spans. Vibration frequency and bending moments in the bridge deck with live load along only half of the bridge appear to be critical in the design. Parametric studies showed that low or no post-tension
force reduces the need for reinforcement and bearing for the bridge in the form of hinged fixed bearing can be better then fixed rigid bearing. (Less)
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author
Al-Janabi, Taha LU
supervisor
organization
course
VBK920 20121
year
type
H3 - Professional qualifications (4 Years - )
subject
keywords
Stress ribbon bridge, Pedestrian bridge, Curved beam, Suspension structure, Cable structure, Post-tension.
report number
TVBK-5216
ISSN
0349-4969
language
Swedish
id
3132390
date added to LUP
2012-10-24 14:54:57
date last changed
2012-10-24 15:02:07
@misc{3132390,
  abstract     = {A stress ribbon bridge is a kind of suspension bridge, which finds its roots in a very old bridge type, namely the rope bridge. Compared to a rope bridge, the stress ribbon bridge has a reinforced concrete slab. This has bending rigidity and significant weight, which eliminates the flexibility that is typical of rope bridges and provides stability and rigidity such that the bridge also can be used for vehicular traffic.
The current report is an introduction to the bridge type. Its appearance, construction, production, use, typical dimensions, static and dynamic operation are briefly described. The principles, equations and criteria for a preliminary design are also given. Depending on the load type, deformations and stresses can be calculated analytically or numerically
using the finite element method. Both methods are used in an example of preliminary design. Diagrams show how various design parameters can affect the function of a bridge with a span of 80 m. When designing a stress ribbon bridge there are different stages in construction and usage
time. This report takes into account five different stages:
- Stage 0: Installation of bearing cables with dead load of separated concrete segments.
- Stage 1: The concrete segments cast together, applying post-tension force and then assemble all the dead load from the non-structural parts.
-Stage 2: Official opening of the bridge. This means the introduction of live load and also temperature variation.
- Stage 31: Long-term effects add to the analysis of Stage 1.
- Stage 32: The final stage involves a modification of the quantities at Stage 2 and introducing the time-dependent effects.

The preliminary calculations in this report suggest that stress ribbon bridges may be of special interest for pedestrian and bicycle bridges with long spans. Vibration frequency and bending moments in the bridge deck with live load along only half of the bridge appear to be critical in the design. Parametric studies showed that low or no post-tension
force reduces the need for reinforcement and bearing for the bridge in the form of hinged fixed bearing can be better then fixed rigid bearing.},
  author       = {Al-Janabi, Taha},
  issn         = {0349-4969},
  keyword      = {Stress ribbon bridge,Pedestrian bridge,Curved beam,Suspension structure,Cable structure,Post-tension.},
  language     = {swe},
  note         = {Student Paper},
  title        = {Introduktion av spännbandbro},
  year         = {2012},
}