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Double Wedge Model and Design Charts for Displacement-Based Design of Canti...

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ODOT Commission Room

200 NE 21st St.

Oklahoma City, OK 73105

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Double Wedge Model and Design Charts for Displacement-Based Design of Cantilever Retaining Wells

Presented by: Dr. Amit Prashant

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Case studies have reported failure of cantilever retaining walls under earthquake loading due to lack of sufficient understanding on the seismic design of these structures. A displacement-based design methodology for cantilever retaining walls has been developed assuming double wedge formation in the backfill and with due consideration to sliding and rotational failure modes. Experimental investigations show the formation of double wedge with v-shaped rupture planes in the backfill evolving from the heel of wall, wherein practically, the rupture planes may or may not intersect the backface of wall. The double wedge model computes seismic sliding displacements of these walls due to the applied earthquake motion and the tangential downward movement of soil wedge along the rupture planes. To compute residual and peak rotational displacements at the top of wall in a simplified manner, residual and peak displacement factor have been proposed to be multiplied with sliding displacements computed from the model. These factors are determined after analyzing 144 cases of rigorous FE non-linear dynamic analysis. Similar exercise has been performed on wall with shear key by analyzing 64 different cases. To account for uncertainties associated with the effect of earthquake characteristics on deformation response of wall, suitable load factors have been proposed in the realm of displacement-based seismic design using LRFD framework. These load factors depend on the PGA of earthquake under consideration. As a much simpler alternative, design charts and corresponding equations based on double wedge model have been proposed to estimate the required heel-length of wall for the expected seismic ground motion.

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ODOT Commission Room

200 NE 21st St.

Oklahoma City, OK 73105

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