The International Information Center for Structural Engineers

Modelling the Fire Resistance of Prestressed Concrete Floors using Multi-Spring Connection Elements

Authors
J.K. Min,R.P. Dhakal,P.J. Moss,A.H. Buchanan,A.K. Abu.
Year
2012
Book Title or Journal
Journal of Structural Fire Engineering
Volume
3
Number
1
Number of pages
1-18
Description
The fire resistance of precast prestressed concrete floor systems is heavily influenced by the end connections and the stiffness of the surrounding structure, both of which must be considered in any analysis. Analysing floor slabs with beam or shell elements whose end nodes share the nodes of supporting beams leads to a major problem for precast prestressed flooring systems where the steel tendons terminate at the end of the flooring units, because the approach of sharing nodes of the supporting beam and floor assumes that these tendons are anchored into the supporting beams. In order to solve this problem, a “multi-spring” connection element has been developed. Experimental data available from previous research work has been used to validate the finite element model. It is concluded that the inclusion of the multi-spring connection results in more accurate predictions of prestressed hollowcore slab behaviour in fire conditions.
Tags
Fire resistance

RETURN TO CATEGORY