Suspended carrier
A trussed girder is a construction that consists of a girder with a drawstring on the underside that runs over one or more short posts. This undervoltage reduces the deflection of the beam so that it can be made weaker. Typical designs are between 10 and 30 meters long.
Today the entire construction is usually made of steel , but combinations of a wooden beam with steel support parts can also be used. The tension band usually consists of rods , but can also be made with a wire rope . The posts are only subjected to pressure. They must be secured against twisting by being either rigidly connected to the beam or, in the case of beams lying next to one another, connected to those of the neighboring beam with cross braces.
Suspended girders are mainly used in roof structures as rafters or trusses , but also as spars of ladders , in bridge construction for pipe bridges , ribbon bridges or pedestrian bridges . In the past, the construction was also used for the side members of railroad cars , called trusses there. The undervoltage can also be attached to existing beams at a later date in order to strengthen them.
literature
- B. Tokarz: Suspended girders . Ed .: Institute for Structural Design and Structural Design, University of Stuttgart. 1999 ( online ).
- Karl-Eugen Kurrer : History of Structural Analysis. In search of balance , Ernst and Son, Berlin 2016, p. 34f, ISBN 978-3-433-03134-6 .
Web links
Individual evidence
- ↑ 2.5. underslung carrier. In: E-learning in steel construction. Retrieved January 11, 2014 .
- ↑ Estimation of practical dimensions. HTW Dresden, accessed on January 11, 2014 .
- ^ Wolfram Lohse: Stahlbau 2 . Springer DE, 30 March 2005, ISBN 978-3-322-80166-1 , p. 107–.