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P–Delta effects are the result of gravity loads acting through the structure’s lateral displacement. Typically, whenever columns have small lateral displacement it is acceptable to neglect the P-Delta effect, but as columns experience high levels of nonlinearity it is crucial to accurately capture the PDelta effects. It is of main importance to reliability detect the safe threshold for ignoring the P-Delta effects. Caltrans SDC provides a procedure that can be used to evaluate whether P-Delta effects can be neglected in design. Whenever requirements are satisfied predefined displacement ductility is used to design structural elements. This research intends to study the reliability of threshold proposed by the Caltrans SDC for ignoring the P-Delta effects. Nonlinear time history analysis is used to compare the maximum reached displacement ductility with and without P-Delta effects.

An Investigation on Reliability of RC Bridge Columns Designed for Displacement Ductility Proposed by the Caltrans SDC