Based on the development requirements of lightweight,high-strength and modularization of emergency bridges,a modular fiber-reinforced-polymer(FRP)-metal T-type girder bridge was proposed.The structure sizes,spatial layouts,member types,connection type and rapid erection methods of the hybrid T-type girder bridge were firstly introduced.Secondly,based on the torsion theory of open and closed thin-walled cross-section rods,a simplified calculation formula for structural torsional stiffness was derived.Finally,the corresponding numerical analysis was carried out based on the general software ANSYS,and the influence factors of structural torsional stiffness were analyzed based on the simplified calculation formula.The results indicate that:compared with the traditional single-lane steel emergency bridge,the hybrid T-type girder bridge shows an obvious weight reduction;the theoretical solutions of structural torsional stiffness coincide well with the computed values,and the simplified theoretical model can thus be used to predict the torsional stiffness of the single T-type girder;the torsional moment of the single T-type girder is mainly resisted by torsion of longitudinal members and web diagonal members.
bridge engineeringT-type girdertheoretical analysistorsional stiffnessfiber-reinforced-polymerfinite element modelemergency bridge
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