Abstract
Drilled shafts are often subjected to various lateral loads due to earth pressure, wind loads and/or impact loads. Many studies have investigated the behavior of drilled shafts under lateral loads. However, there is limited study on the effect of cyclic loading on drilled shafts, which is of great importance during a hurricane strike. This paper encompasses a numerical study using three-dimensional (3D) finite difference software, FLAC3D, which investigated interaction between a drilled shaft and an MSE wall under cyclic loading event. The backfill material was simulated by a stress-dependent model, which can account for the hardening due to confining stresses. The interactions between dissimilar materials were represented by frictional interface at the contacts. The numerical simulation scrutinized the effects of soil friction angle and the loading cycles on the performance of the drilled shaft and MSE wall under both loading and unloading conditions. The result indicates that the cyclic loading leads to gradual accumulation of the displacement, which cannot be effectively considered in current design method.
Highlights
Acting as foundations of bridges, highway interchanges, and retaining structures, drilled shafts need to provide substantial resistance to significant lateral loads induced by wind pressure, water flow, earth pressure, ground excitation etc. [1, 2]
In recent years, drilled shafts sometimes have to be built in an MSE wall to support lateral loads, primarily from wind and/or seismic loads
No study has been completed to assess the effect of a cyclic loading on drilled shaft if built in an MSE wall
Summary
Acting as foundations of bridges, highway interchanges, and retaining structures, drilled shafts need to provide substantial resistance to significant lateral loads induced by wind pressure, water flow, earth pressure, ground excitation etc. [1, 2]. Originated from the theory of Beam on Elastic Foundation (BEF), the method to evaluate the response of a laterally loaded drilled shaft in soil/rock has been well established [3, 4], which is often called the p-y curve method in practice. In recent years, drilled shafts sometimes have to be built in an MSE wall to support lateral loads, primarily from wind and/or seismic loads. Under this circumstance, the existing p-y curves are not applicable. Rollins et al [12] studied driven pile in an MSE wall and suggested additional load to be considered in the drilled shaft and MSE wall design during a seismic event. No study has been completed to assess the effect of a cyclic loading on drilled shaft if built in an MSE wall
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