Equivalent bending stiffness of simply supported preflex beam bridge with variable cross-section

YANG Ming^1,2, HUANG Qiao^1,2, WANG De-jun¹

1.School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, China;2.Transportation College, Southeast University, Nanjing 210096, China



Abstract:

In order to understand mechanical characters and find out a calculating method for preflex beams used in particular bridge engineering projects, two types of simply supported preflex beams with variable cross-section, preflex beam with alterative web depth and preflex beam with alterative steel flange thickness, are discussed on how to achieve the equivalent moment of inertia and Young¡¯s modulus. Additionally, methods of calculating the equivalent bending stiffness and post-cracking deflection are proposed. Results of the experiments on 6 beams agree well with the theoretical analysis, which proves the correctness of the proposed formulas.

Key words:  variable cross-section  preflex beam  equivalent moment of inertia  equivalent bending stiffness

DOI£º10.11916/j.issn.1005-9113.2010.01.003

Clc Number:U441.2

Fund: