Improved Geometric Design of Earthquake-Resistant RC Slender Structural Walls. I: Parametric Study
01 May 2014-Journal of Engineering Mechanics-asce (American Society of Civil Engineers)-Vol. 140, Iss: 5, pp 04014006
TL;DR: In this paper, a linear-elastic finite-element analysis of an isolated wall-footing system under estimated actual vertical and lateral forces is carried out, and a new tapered configuration is proposed in the bottom portion of walls with and without enlarged boundary elements.
Abstract: In multistoried RC wall-frame buildings, properly designed and detailed RC slender structural walls significantly improve earthquake resistance. In walls on isolated spread footings with marginal taper, severe stress concentration is observed at the wall-footing junction during earthquake shaking. In this paper, new tapered configurations are proposed in the bottom portion of walls with and without enlarged boundary elements. Analytical correlations are derived among salient structural and soil parameters of the tapered wall-footing. An extensive parametric study is carried out through linear-elastic finite-element analysis of an isolated wall-footing system under estimated actual vertical and lateral forces. Under the estimated forces, significant loss of contact is observed at the bottom of the wall-footing; thus, soil or rock anchors need to be provided to ensure stability of the wall-footings during strong shaking. Force flow from wall to footing improves significantly in the proposed integrat...
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TL;DR: In this paper, a stepwise seismic design procedure is proposed of tapered integrated wall-footing systems with soil or rock anchors at the bottom of the wall, which incorporates a capacity design of the plastic hinge region above the tapered portion and an elastic design of a tapered part.
Abstract: In a companion paper, new tapered configurations are proposed of slender RC structural walls with and without enlarged boundary elements at the wall-footing junction region. On the basis of identified parametric limits and the wall response in linear-elastic finite-element analyses, a stepwise seismic design procedure is proposed of tapered integrated wall-footing systems with soil or rock anchors at the bottom. This incorporates a capacity design of the plastic hinge region above the tapered portion and an elastic design of the tapered portion. The location of the region of seismic damage and energy dissipation in the wall is controlled by proportioning of the tapered wall-footing as per the new design procedure.
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TL;DR: In this article, a simplified applica- tion of displacement-based design was incorporated into ACI 318-99 to evaluate detailing requirements at wall boundaries, and the results of experimental studies of moderate-scale, slender wall specimens with rectangular-shaped and T-shaped cross sections were used to verify results predicted using displacementbased design, which were subjected to monotoni-cally increasing reversed cyclic lateral loads and constant axial load of approximately 0.10 Ag f c.
Abstract: Application of displacement-based design for slender structural walls results in predictions for the wall normal strain gradient derived from estimating the wall neutral axis depth and maximum compressive strain at the wall boundary, for a given top displacement. Based on this strain distribution, requirements for special boundary element transverse reinforcement are assessed. A simplified applica- tion of displacement-based design was incorporated into ACI 318-99 to evaluate detailing requirements at wall boundaries. The results of experimental studies of moderate-scale, slender wall specimens with rectangular-shaped and T-shaped cross sections are used to verify results predicted using displacement-based design. Detailing at the boundaries of the wall specimens, which were subjected to monotoni- cally increasing reversed cyclic lateral loads and constant axial load of approximately 0.10 Ag f c , were varied to assess behavior for a variety of conditions. Findings indicate good agreement between predicted and measured strain ~curvature! distributions for a range of drift levels, verifying that displacement-based design is both a powerful and flexible tool for assessing wall detailing requirements.
301 citations
TL;DR: In this paper, a series of tests on a large centrifuge, including 40 models of shear wall footings, were performed to study the nonlinear load-deformation characteristics during cyclic and earthquake loading.
199 citations
"Improved Geometric Design of Earthq..." refers background in this paper
...Although past studies have focused on the rocking behavior of shallow footings (Gajan et al. 2005; Gajan and Kutter 2008; Allotey and El Naggar 2008), local failure at the wall-footing junction has not been investigated....
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