engleski

Application of Glulam beam girders with external pre-stressing

The paper presents details of a numerical analysis and construction of glulam beam girder structures with external pre-stressing. We have applied such structures on spans ranging from 24 to 32 m for the purpose of reduction of overall costs of glulam materials. For the external pre-stressing, steel braces S355 and Besista standard connectors were used. Vertical elements supporting the beam girder approximately at one-third span are also steel sections transferring compression forces. Calculations have been made by means of STAAD Pro and COSMOSM software. Details of calculations and modelling of structures have been presented. In all cases, the girder system with external pre- stressing is supported with steel columns. In the solution applied for an overhang structure of 24 m span close to Zagreb, the static system was defined as two-hinged framework system, capable of accepting bending moments in angular connections. In such rigid connections, dowels were applied as well as steel sheet through the middle of the section of the timber girder. The solution of the connection will also be presented in the paper.

glulam beam girder; outside prestressing; STAAD & COSMOSM calculations; connection details

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