Seismic non-linear soil pile structure interaction of highway bridges in central and eastern United States.

摘要

The objective of this study is to develop a practical methodology that uses non-linear soil-pile-structure interaction (SPSI) in the seismic analysis of the bridges in the Central and Eastern United States (C&EUS). In the proposed non-linear SPSI procedure, the superstructure and the piles are modeled as beam-column elements, and the soil around the piles is modeled as non-linear p-y elements. The mechanical properties of the non-linear p-y element vary with the soil type and depth. The p-y element used in this study has three parts: the plastic component, the elastic component, and the damping component. The damping model is based on the series radiation damping methodology. In addition, as part of the non-linear SPSI procedure, a multi-input earthquake acceleration time histories is implemented as a module in the computer program FEAP (Finite Element Analysis Program).; Through an example problem, it is shown that the proposed non-linear SPSI procedure has significant effects on the bridge response. Through several parametric studies, it is shown that the AASHTO Guide Specifications for Seismic Design of Highway Bridges may result in smaller displacement at the top of the bridge pier than the proposed SPSI model, and that the seismic response of the bridge will be underestimated.; A comparison is made between the response of a typical bridge subjected to earthquakes typical of the C&EUS and the Western United States (WUS). It is concluded that for a given magnitude and epicentral distance, SPSI effects are more significant in the C&EUS than in the WUS, resulting in higher structural displacement at the top of the bridge pier and higher member design bending moments.