Computer Analysis of Continuous P/C Highway Bridge Girders with Variable Depth

by Hani Melhem, (A.M.ASCE), Kansas State Univ, Manhattan, United States,
Weiqun Zhang, Kansas State Univ, Manhattan, United States,

Document Type: Proceeding Paper

Part of: Computing in Civil Engineering


A computational procedure and associated computer program were developed for the analysis and design of P/C continuous beams with variable depth. Using this program, continuous girders with non-prismatic cross-sections and non-symmetric configuration can be analyzed when subjected to various external loads including the AASHTO live loads, and different design options can be readily investigated and easily compared to select the optimum design. By studying a three-span continuous bridge and for the same live load, the required prestressing force and the number of steel tendons are reduced if the beam depth increases towards the support. When the tendon profile varies parabolically, the straight haunches are the most efficient.

Subject Headings: Computer analysis | Girder bridges | Highway bridges | Continuous bridges | Highway and road design | Bridge design | Load factors | Steel beams

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