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Earthquakes and Structures
  Volume 11, Number 4, October 2016, pages 681-699

Numerical study of steel box girder bridge diaphragms
Shervin Maleki, Pantea Mohammadinia and Abouzar Dolati

    Steel box girders have two webs and two flanges on top that are usually connected with shear connectors to the concrete deck and are also known as tub girders. The end diaphragms of such bridges comprise of a stiffened steel plate welded to the inside of the girder at each end. The diaphragms play a major role in transferring vertical and lateral loads to the bearings and substructure. A review of literature shows that the cyclic behavior of diaphragms under earthquake loading has not been studied previously. This paper uses a nonlinear finite element model to study the behavior of the end diaphragms under gravity and seismic loads. Different bearing device and stiffener configurations have been considered. Affected areas of the diaphragm are distinguished.
Key Words
    steel bridge; tub girder; end diaphragm; seismic; cyclic behav
Department of Civil Engineering, Sharif University of Technology, Tehran, Iran

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