Diaphragm for Extradosed Cable Stayed Bridge

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Title: Diaphragm for Extradosed Cable Stayed Bridge

Author(s): Trevor J. Kirkpatrick and Robert B. Anderson

Publication: Special Publication

Volume: 273

Issue:

Appears on pages(s): 1-18

Keywords:

Date: 9/20/2010

Abstract:
This example demonstrates strut-and-tie principles to design an internal diaphragm for an extradosed cable stayed bridge with a cast-in-place segmental box girder. The diaphragm carries vertical shear from the webs of the box girder around access openings to the indirect bearings on a tower strut. Several models are investigated before the design model is presented. Tie forces are determined, and reinforcing steel is selected. A computer program is introduced to perform the detailed (and often iterative) stress checks for the struts and nodal zones, and sample calculations for the struts and nodal zone stresses are provided.