Abstract: (5785 Views)
In this paper, evaluation of torsional stiffness in beam and slab bridge deck elements is presented. A beam and slab bridge
decks structurally behave as a grillage. A grillage has an efficient transverse load distribution due to transverse asymmetric
load. In the case of bridge deck without transverse beams in the span, transverse load distribution depends on the torsional
stiffness of longitudinal beams, transverse beams over the supports and deck slab. The results of load testing conducted on
series of bridges in Croatia are compared with results obtained on different numerical grillage models in which torsional
stiffness of main structural elements was varied. Five different numerical models for each tested bridge are used. To evaluate
torsional stiffness of main structural elements of the bridge the transverse distribution coefficients are introduced. The design
value of the coefficients of torsional stiffness reduction for verification of the serviceability limit state (SLS), with assumption
of normal probability distribution is determined. The same coefficient is calculated using recommendation for torsional
stiffness reduction in concrete elements defined by Model code CEB-FIB 1990 (MC 90). According to conducted analyses the
design value of the coefficient of torsional stiffness reduction for verification of the serviceability limit state of main structural
elements of beam and slab bridge deck is proposed.