Abstract
The Nonlinear F.E. code Structural Analysis Program (SAP) in which the primary nonlinear characteristics of bearings, impact elements and steel restrainer cables considered herein in order to investigate the dynamic analysis of a multi-span simply supported MSSS prestressed concrete bridge, equipped with steel restrainer cables and Lead Rubber Bearings LRB devices including Soil Structure Interaction (SSI) effects. A MSSS bridge with restrainer cables and lead rubber bearings at the two abutments and intermediate bents located in North Algeria is selected according to RPOA for seismic design category 1 is considered in this study. A detailed 3D nonlinear analytical model of study bridge subjected to three components identical seismic excitation including pounding elements, restrainer cables and bearing devices at expansion joints is developed. The nonlinear characteristics of theses boundary elements are represented by bilinear hysteretic models. Under strong seismic excitations, the large longitudinal displacements result the collision between bridge decks or even unseating of these decks at expansion joints of MSSS bridge. Finally, the study reveals among others that in order to prevent deck unseating resulting from restrainer failures and subsequent bridge collapse, particular attention should also be given to proper design of nonlinear characteristics of restrainers and bearing devices.
Highlights
The multi-span supported MSSS prestressed concrete bridgesare frequently used in highway bridgesrepresenting an essential component of transportation networks
This paper presents some results from an exhaustive investigation carried out on the dynamic analysis of amulti-span supported MSSS prestressed concrete bridge equipped with retrainers and seismic isolation devices at expansion joints and abutments including Soil Structure Interaction (SSI) effects
The superstructure and multi-columns bents of bridge are modelled as elasticbeam elements, while bridge additional connecting components such as the expansion joints that represent pounding elements aremodelled by linear spring elements, while the lead rubber bearings and restrainer cables are modelled by nonlinear springelements accounting the energy dissipation under strong motion
Summary
The multi-span supported MSSS prestressed concrete bridgesare frequently used in highway bridgesrepresenting an essential component of transportation networks. This paper presents some results from an exhaustive investigation carried out on the dynamic analysis of amulti-span supported MSSS prestressed concrete bridge equipped with retrainers and seismic isolation devices at expansion joints and abutments including Soil Structure Interaction (SSI) effects. In this context, The nonlinear time history analyses using detailed 3D Finite Element Model FEM of a MSSS bridge located in North Algeria are performed to assess the performance of the steel restrainer cables and Lead Rubber Bearing devices LRB under the 3D components of severe seismic excitation. Description and 3-D nonlinear analytical modelind of MSSS prestressed concrete bridge
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