Study on structural design of Highway box structuresS.S.L.D.ChinthakaSupervised by Dr.BaskaranProble !"ro previous presentation#Box structures which are used in Sri Lanka are not standardizedFindingthegoverningdesigncriteriaand optimizingthestructuraldesignand standardizeforboxstructurecansavea considerableamountofmoneyforthe country$b%ectives !"ro previous presentation# To fnd governing design criteria for box structures inimum !"F Bending Shear #rack width Thermal and shrinkageTodevelopstandardtablesincludingmember thicknesses and !einforcements for di$erent sizes and fll heights by optimizing the structural design&ethodology !"ro previous presentation# %umerical modelling of box for di$erent sizes and di$erent fll height #alculating amount of !"F re&uired for di$erent criteria inimum !"F Bending Shear #rack width Thermal and shrinkage 'dentify critical criteria%umerical modelling of box for di$erent sizes and di$erent fll height (eometry modellingBoundary conditionsLoadings%umerical modelling of box)(eometry*tttbtwtw+,+-,-,-. ,/ tw+-. + / 012 )tt/tb*%umerical modelling of box)(eometry*%umerical modeling of box)(eometry*%umerical modeling of box )Boundary conditions*3 )k%"m4"m* . 50 x SF x Bearing #apacity %umerical modeling of box )Loadings* 6ead#alculate using section properties and density ofconcreteS'6 )7sphalt and 7B#*#alculate using thicknesses and densitiesSurcharge loadings)BS 2500849400:#L 21;14*+7 c loadings)BS 2500849400:*+7?6L )#L :141