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1968•E-PeriodicaOpen access

The response of beam and slab bridges to moving forces

K T Iyengar, K. S. Jagadish

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Abstract

THE DYNAMIC RESPONSE OF A HIGHWAY BRIDGE UNDER MOVING LOADS IS USUALLY STUDIED BY TREATING THE BRIDGE AS A BEAM. SUCH A TREATMENT WOULD BE SATISFACTORY IF THE SPAN/WIDTH RATIO OF THE BRIDGE IS LARGE. HOWEVER, A MAJORITY OF HIGHWAY BRIDGES MAY HAVE SPANS COMPARABLE TO THE WIDTHS. FOR SUCH BRIDGES, THE BEAM THEORY IS NOT ADEQUATE AND A SUITABLE TWO- DIMENSIONAL THEORY WILL HAVE TO BE ADOPTED TO CONSIDER THE INFLUENCE OF THE TRANSVERSE FLEXIBILITY OF THE BRIDGE ON ITS RESPONSE. IN THIS PAPER THE DYNAMIC RESPONSE OF SIMPLE-SPAN BEAM AND SLAB HIGHWAY BRIDGES SUBJECTED TO A MOVING CONCENTRATED FORCE IS STUDIED. THE HIGHWAY BRIDGE IS TREATED AS AN ORTHOTROPIC PLATE, AND THE NORMAL MODE METHOD IS USED IN THE RESPONSE ANALYSIS. NUMERICAL RESULTS ARE PRESENTED FOR TYPICAL CASES IN THE FORM OF AMPLIFICATION SPECTRA AND HISTORY CURVES. /AUTHOR/

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What this paper is about

THE DYNAMIC RESPONSE OF A HIGHWAY BRIDGE UNDER MOVING LOADS IS USUALLY STUDIED BY TREATING THE BRIDGE AS A BEAM. SUCH A TREATMENT WOULD BE SATISFACTORY IF THE SPAN/WIDTH RATIO OF THE BRIDGE IS LARGE. HOWEVER, A MAJORITY OF HIGHWAY BRIDGES MAY HAVE SPANS COMPARABLE TO THE WIDTHS. FOR SUCH BRIDGES, THE BEAM THEORY IS NOT ADEQUATE AND A SUITABLE TWO- DIMENSIONAL THEORY WILL HAVE TO BE ADOPTED TO CONSIDER THE INFLUENCE OF THE TRANSVERSE FLEXIBILITY OF THE BRIDGE ON ITS RESPONSE. IN THIS PAPER THE DYNAMIC RESPONSE OF SIMPLE-SPAN BEAM AND SLAB HIGHWAY BRIDGES SUBJECTED TO A MOVING CONCENTRATED FORCE IS STUDIED. THE HIGHWAY BRIDGE IS TREATED AS AN ORTHOTROPIC PLATE, AND THE NORMAL MODE METHOD IS USED IN THE RESPONSE ANALYSIS. NUMERICAL RESULTS ARE PRESENTED FOR TYPICAL CASES IN THE FORM OF AMPLIFICATION SPECTRA AND HISTORY CURVES. /AUTHOR/

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Available abstract

THE DYNAMIC RESPONSE OF A HIGHWAY BRIDGE UNDER MOVING LOADS IS USUALLY STUDIED BY TREATING THE BRIDGE AS A BEAM. SUCH A TREATMENT WOULD BE SATISFACTORY IF THE SPAN/WIDTH RATIO OF THE BRIDGE IS LARGE. HOWEVER, A MAJORITY OF HIGHWAY BRIDGES MAY HAVE SPANS COMPARABLE TO THE WIDTHS. FOR SUCH BRIDGES, THE BEAM THEORY IS NOT ADEQUATE AND A SUITABLE TWO- DIMENSIONAL THEORY WILL HAVE TO BE ADOPTED TO CONSIDER THE INFLUENCE OF THE TRANSVERSE FLEXIBILITY OF THE BRIDGE ON ITS RESPONSE. IN THIS PAPER THE DYNAMIC RESPONSE OF SIMPLE-SPAN BEAM AND SLAB HIGHWAY BRIDGES SUBJECTED TO A MOVING CONCENTRATED FORCE IS STUDIED. THE HIGHWAY BRIDGE IS TREATED AS AN ORTHOTROPIC PLATE, AND THE NORMAL MODE METHOD IS USED IN THE RESPONSE ANALYSIS. NUMERICAL RESULTS ARE PRESENTED FOR TYPICAL CASES IN THE FORM OF AMPLIFICATION SPECTRA AND HISTORY CURVES. /AUTHOR/

Key concepts: Structural engineering, Bridge (graph theory), Slab, Span (engineering), Beam bridge, Beam (structure), Transverse plane, Orthotropic material

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