Wheel Load Distribution on Simply Supported Skew I‐Beam Composite Bridges
Publication: Journal of Structural Engineering
Volume 119, Issue 2
Abstract
This paper presents distribution factor expressions for wheel‐load distribution to interior and exterior girders of concrete on multisteel beam composite bridges of medium span length. These expressions were derived from finite element analysis of 36 bridges: with 9 ft spacing of girders, different spans (75, 100, and 125 ft), different widths (39, 57, and 66 ft), different skew angles (0°, 20°, 40°, and 60°), and different spacing and size of intermediate cross frames. The analysis recognizes the three‐dimensional interaction of all bridge members, places the bearings at their actual location, and considers the effect of the restraining forces at the bolster and rocker bearings. To test the validity of the adopted discretization scheme, its results were validated by testing an actual 137 ft. span four‐lane, 59.5° skew bridge. The derived distribution factor expressions give values that are generally much lower than the current American Association of State Highway Transportation Officials (AASHTO) values, particularly for skew bridges. In addition to the girder spacing, these distribution factors recognize the effect of skew, span length, deck slab width, number of girders, and number of loaded traffic lanes, as well as the probability that positioning all the standard AASHTO trucks in locations to produce maximum flexure effects is reduced as the number of loaded lanes exceeds two.
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References
1.
“ADINA, theory and modeling guide.” (1984). Report AE 84‐6. ADINA Engineering.
2.
“ADINA‐IN, Program for Generation of Input Data to ADINA.” (1984). Report AE 84‐6, ADINA Engineering.
3.
Bishara, A. G. (1986). “Analysis for design of bearings at skew bridge supports.” Final Report, Federal Highway Administration. Washington, D.C.
4.
Chen, T. Y., Siess, C. P., and Newmark, N. M. (1954). “Studies of slab and beam highway bridges, part IV: Moments in simply supported skew I‐beam bridges.” Engineering Experiment Station Bulletin, No. 439, University of Illinois, Urbana, Ill.
5.
El‐Ali, N. D. (1986). “Evaluation of internal forces in skew multi‐stringer simply supported steel bridges,” PhD thesis, Ohio State University, Columbus, Ohio.
6.
Marx, H. J., Khachaturian, N., and Gamble, W. L. (1986). “Development of design criteria for simply supported skew slab‐and‐girder bridges.” Structural Research Series No. 522, University of Illinois, Urbana, Ill.
7.
Newmark, N. M. (1948). “Design of I‐Beam Bridges.” J. Struct. Div., ASCE, 74(1), 305–330.
8.
Nutt, R. V., Schamber, R. A., and Zokaie, T. (1988). “Distribution of wheel loads in highway bridges.” Final Report No. 83, IMBSEN & Associates, Inc., Sacramento, Calif.
9.
Sanders, W. W., and Elleby, H. A. (1970). “Distribution of wheel loads on highway bridges.” Highway Research Program Synthesis of Highway Practice III, Transportation Research Board, National Research Council, Washington, D.C.
10.
“SAP IV, a structural analysis program for static and dynamic response of linear systems.” (1974). EERC Report No. 73‐11, University of California, Berkeley, Calif.
11.
Standard specifications for highway bridges. (1989). 14th Ed., American Association of State Highway Transportation Officials (AASHTO), Washington, D.C.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 119 • Issue 2 • February 1993
Pages: 399 - 419
Copyright
Copyright © 1993 American Society of Civil Engineers.
History
Received: Jan 10, 1992
Published online: Feb 1, 1993
Published in print: Feb 1993
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