Abstract:
In the study of Ultimate Load Behaviour of Skew Slab Bridge Deck.
reinforced concrete double lane skew slab bridge deck model were
selected. The study was conducted with 1/ 4th scale models. There
were two types of model, one with main reinforcement parallel to
the free edge and named model type-I. The other was with main
reinforcement perpendicular to the support and named model
type-2. Transverse reinforcement for both the type were in the
direction parallel to the abutments. Skew angle for both the type of
lIlodel were 30 degrees. A total of four models were tested
comprising two models of each type.
The models were designed by WSD method for AASHTO HS20
highway loading and specification. The overall depth of the slab and
quantity of steel were calculated on the basis of the effective right
. span of the slab. The slabs designed in this way were subjected to
scaled 1.IS20 loading for experimental investigation. The load cycled
five times first on one side lane and cycled five times in the other
side and then increased to failure in one lane. Deflections and
concrete surface strains were recorded at different stages of
loading.
In the study a greater deflection is recorded at service and at
ultimate load level for model type-I than that of model type-2. The
ultimate carrying capacity of model type-2 is found to be more than
tll:1t of model type-I. For model type-2. carrying capacity is about
8.25 times of service load whereas it is about 7.25 times for model
type-I for the load arrangement in one lane (model designed for 2
lane loading) used till ultimate failure of the model.
Stiffness of the slab is calculated from the deflection consideration
and it is found that stiffness of model type-2 is about 35.23% more
than that of model type- I at service load and 25.70% more at
double of the service load
