SEISMIC ANALYSIS OF SKEW CURVED BRIDGES FOR ZONE 4 SEISMOLOGY
DOI:
https://doi.org/10.69980/tbxxp341Keywords:
Seismic Analysis, Bridge Engineering, Earthquake Engineering, Nonlinear Time History , Analysis, Skew Curved Bridges, Seismic Isolation SystemsAbstract
Due to the complex behavior of bridges at this level of seismic failure, skewed-curved bridges constitute a severe challenge to structural engineering. They are different from straight bridges in that the combined form of these two curves and angles results in a clear gap between the center of mass and the center of rigidity. So that gives the rock a "pinball" effect in an earthquake. In zones like Zone 4, which experience much severe ground movement, these bridges encounter issues such as excessive deck rotations, pounding between decks and abutments, and risk of falling off their supports. Using Nonlinear Time History Analysis (NLTHA), a new approach is proposed for understanding how such structures react dynamically, with particular emphasis given to their curvature radius and effect on performance. Curvature and skew angles push up the shear forces on piers and cause bigger movement in expansion joints. Following IS 1893:2002 guidelines, the study identifies some key failure modes, such as the "kick" effect at abutments. Its focus is to draw attention to demand for some type of the latest seismic isolation or restraint system to prevent collapse in earthquake-prone regions. With the transitions (if it doesn't sound boring): the author alters styles and breaks from established patterns.
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