ANALYSIS OF OPEN STEEL BOX SECTIONS WITH BRACING
Braced open thin-walled steel box girders under combined bending and torsion were studied. Two model box girders were tested in the elastic range. Analytically, the top bracing of open box sections was converted to an equivalent plate thus forming an equivalent closed box. Experimental results on braced open boxes and computed stresses for the equivalent closed boxes agreed well. Rotations calculated from deflections without adjustment of support rotations were higher than the values computed for the equivalent closed boxes. Deformation of cross section was neglected in the analysis. The stresses in the bracing members were estimated using stresses in the equivalent top plate as loads on a bracing frame. The estimated stresses also compared well with experimental results. Based on the concept of equivalent closed box, a procedure was recommended for the selection of bracing member sizes.
- Sponsored in part by Federal Highway Administration, Washington, D.C. and Pennsylvania Dept. of Transportation, Harrisburg.
Lehigh UniversityFritz Engineering Laboratory
Bethlehem, PA USA 18015
Harrisburg, PA USA 17120
Washington, DC USA 20590
- McDonald, R E
- Chen, Y S
- Yilmaz, C
- Yen, B T
- Publication Date: 1973-10
- Pagination: 45 p.
- TRT Terms: Box beams; Box girders; Bracing; Bridge design; Bridges; Deflection; Deformation; Elastic analysis; Girder bridges; Girders; Metal bridges; Shear stress; Steel bridges; Stresses; Structural design
- Old TRIS Terms: Normal stress
- Subject Areas: Bridges and other structures; Highways;
- Accession Number: 00143209
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: FEL-380.7 Intrm Rpt., FHWA-RD-76-S0504
- Files: NTIS, TRIS, USDOT, STATEDOT
- Created Date: Oct 26 1976 12:00AM