Fall 2002
Dynamic
Analysis of R.C.C. Bridges
Abu Tahur Raihan Ahmad
The durability, economy and aesthetic beauty of RCC bridges make them an
attractive option for the highway bridges where large engineering constructions
are mainly dependent on concrete. However, the structural analysis for bridges
in practice rarely goes beyond the conventional methods of static structural
analysis. The dynamic effects of moving loads are believed to be considered by
incorporating an ‘impact factor’ with the static load analysis, which is
considered irrespective of the type of structure or the velocity and arrangement
of the moving wheel loads. This work is aimed at presenting a more rational and
detailed dynamic analysis of various types of bridges. The emphasis will be to
provide a more thorough and rational evaluation of the impact factor. A detailed parametric study is performed in this work
to investigate some important details of the behavior of Deck Girder, Continuous
and Balanced Cantilever Bridges, based on dynamic analysis under moving of HS-20
vehicle. Various aspects of the dynamic response of RCC bridges are studied,
comparing with the conventional static structural analysis and changing the
vehicular velocity, damping ratio and number of spans. The effects of
deflection, bending moment and shear are observed. |