Analysis on mechanical properties of a new steel-concrete-steel composite bridge deck system

In response to many diseases associated with the deck of existing orthotropic steel bridge,combined with the structural characteristics of steel box girder,a new steel-concrete-steel(SCS)composite bridge deck system was proposed.To reveal the mechanical properties of the systems,based on the equivalent stiffness method,the general finite element program ANSYS was employed to set up segmental mechanical models of the new SCS composite bridge deck and the traditional orthotropic steel bridge deck respectively.And a comparative analysis on the models was carried out to study the mechanical behaviors.The result shows that,under the concentrated wheel force,the local bending stiffness of the SCS composite bridge deck system is visibly superior to that of the tradi-tional one,and the longitudinal and transverse stiffness ratio tends to be 1.0,which balances the stress,prevents large local deformation,changes the orthotropic characteristics of the traditional steel bridge deck system,and improves the mechanical performance of bridge deck systems.