Abstract
The slant legged rigid frame is one type of the most widely used highway bridges treating the superstructure and the substructure as one unit. This type of construction eliminates the need for concrete piers and positions the supports away from the lower roadway thus giving safe structure. The rigorous analysis of the slant legged bridge is very complicated, time consuming, and the structure has infinite degrees of freedom. The knowledge of natural modes and frequency is basic to understanding the dynamic response of a structure under any kind of excitation. This chapter determines free vibration characteristics of slant legged skew bridge, considering it as a skew type. The bridge is modeled as a space bar element with six degrees of freedom at each node—that is, displacements in x, y, and z directions and rotations in x, y, and z directions. Further, various parameters, such as skew angle, span of the bridge, and geometric stiffness, are considered, and their effect on the bridge is studied. Software is developed in C++ to perform the analysis that basically involves in obtaining the static deflections, shear force, bending moment, natural frequencies, and mode shapes.
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