Attempts on Seismic Retrofitting Method of Leaning-Type Retaining Wall Using Soil Improvement Piles

Ikemoto, Hirofumi; Taniguchi, Yoshinori; takayama, masaki; Takasaki, Hideaki; Fujiwara, Torajiro

doi:10.2208/jscejseee.71.i_749

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(2 citation statements)

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Section: Proposed Methodologymentioning

confidence: 99%

“…They found the compressive force and the inertia load to act together on the reinforcement bars, while the tensile forces were generated in an opposite direction. Ikemoto et al 21 conducted shaking table tests on a leaning retaining wall with stiffeners installed perpendicular to the top edge at the backfill, and top of the wall was rigidly connected to the stiffeners using a connecting material which showed good reinforcement effects. Motivated by the need of an optimal performance-based design approach, the authors in this paper propose a novel reinforcement method as shown in Figure 1C (hereafter referred to as "tilting reinforcement" methodology).…”

Section: Proposed Methodologymentioning

confidence: 99%

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Novel performance‐based seismic reinforcement method for the dry masonry retaining wall located in an urban residential area

Sano,

Sahare,

Itoh

et al. 2024

Earthq Engng Struct Dyn

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In Japan, recently there has been an increase in the failure of dry masonry retaining walls located in an urban residential area due to strong earthquakes. However, currently there are no established optimal seismic reinforcement methods for such dry masonry retaining walls due to issues related to workability and construction cost. This paper presents a novel reinforcement method wherein the tilting reinforcement bars were installed from top of the retaining wall whose individual blocks were integrated. A detailed investigation and discussion on the mechanical behavior of a dry masonry retaining wall is made by comparing the results among different experimental cases which had different seismic reinforcement treatment with the help of tilting table experiments conducted in a geotechnical centrifuge. The results highlighted that the proposed method, the application of tilting reinforcement bars together with the integration of individual wall blocks, led to the best seismic resilient performance of the retaining wall with the least measured soil deformations and soil strains at the backfill. Among all the tested cases, the proposed method resulted in the least mobilization of axial force and bending moment at the top of reinforcement bars which may result in the overall reduction of the construction cost (i.e., by reducing the number of reinforcement bars) aiming toward a performance‐based design. Lastly, an analytical evaluation of the factor of safety (FOS) against collapse as per the Mononobe‐Okabe theory was made which was found to be in excellent agreement with the centrifuge experiments revealing the proposed method to perform best among all the cases.

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Section: Proposed Methodologymentioning

confidence: 99%

Section: Proposed Methodologymentioning

confidence: 99%