School of Engineering

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Interdependence between Structural Engineering and Construction Management

Dr. Abi Shdid attended the tenth conference on Interdependence between Structural Engineering and Construction Management (ISEC-10) in Chicago, IL between May 20 and May 25, 2019, where he presented a research paper titled: Effect of Transient Thermal Gradient on Stresses in Composite Bridges. Composite steel-concrete bridges experience higher thermally induced stresses than their concrete and steel cousins.  These thermal stresses which can result from support restraints, debris accumulating in expansion joints, or from non-uniform thermal gradients, can lead to significant damage in the concrete deck.  Conventional heat transfer theory in solids, in three-dimensional finite element formulation, is used to perform a sequentially coupled thermal-stress analysis in a selected single-span case study bridge.  Actual environmental boundary conditions for a selected geographical region are used to develop the thermal profile.  The vertical thermal gradient is shown to be largely non-linear as opposed to existing models, such as AASHTO.  The thermally induced tensile stresses in the concrete are shown to be significant compared to service load stresses and constitute 60% of the tensile strength of the concrete deck.

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