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- Type of Document: Ph.D. Dissertation
- Language: Farsi
- Document No: 57096 (09)
- University: Sharif University of Technology
- Department: Civil Engineering
- Advisor(s): Khaloo, Ali Reza
- Abstract:
- Reinforced concrete (RC) shear walls with a curved cross-section are appealing structural elements to architects and engineers due to the aesthetic and structural advantages. Owing to the paucity of decent experimental research on curved RC shear walls (CRCSWs), the seismic response of these structural elements is essentially unknown. In that regard, this study includes research on a high-demanding type of structural element, which has found its application in North America, Europe, Asia, and to some extent in the Middle East with relatively no design specifications and laboratory research, structural analysis, and design methodology. Therefore, in order to provide an insight into the overall behavior of such salient elements and to fill the mentioned gap, an state-of-the art experimental testing platform is designed and constructed, which includes a loading system apparatus capable of accommodating displacements of the specimen. A sophisticated monitoring system is also utilized to capture localized as well as full-field deformation data, and record all the rotational movements in the orthogonal directions due to the torsional deformations experienced in the curved RC shear wall. The special configuration of the test unit, test apparatus, as well as the construction process are discussed in detail. The CRCSW is tested pseudo-statically subjected to the fully reversed, lateral cyclic loading. In working to accomplish the objectives of this study, a new number of interesting experimental observations and outcomes have been obtained. The main findings of the research program including the progression of damage, failure mechanism along with the hysteresis response, effective stiffness, displacement ductility factor, strain profiles, and the dissipated energy characteristics are scrutinized. Furthermore, a numerical investigation has been carried out utilizing the finite element (FE) software Abaqus. On the strength of the data obtained from the FE simulation of 90 CRCSWs in three categories of short, squat and slender walls, a regression model has been established, which is advantageous in that it can supply a means for the initial estimation of the shear strength of CRCSWs. The reliability of the proposed expression has then been measured through computing the coefficient of determination index. The average R-factor of 0.88 indicates that the established formulations can potentially well predict the shear strength of CRCSWs. The paper concludes with an investigation into the lateral load resisting performance of the wall under the combined flexural and torsional moments, where it is observed that the induced torsion due to the curved shape of the wall cross-section is responsible for the intensified failure at the tips of the wall, especially at the base level. The findings also reveal that CRCSW can offer a stable hysteretic response with no premature failure, which is a favorable feature regarding the seismic resistance behavior. Finally, as the current design codes recommend no specific provisions for the curved RC shear walls, the experimental evidences presented in this study are generally expected to provide a benchmark for future investigations dealing with the analysis and design of curved RC shear walls under seismic actions
- Keywords:
- Finite Element Model ; Experimental Investigation ; Cyclic Loading ; Analytical Investigation ; Curved Reinforced Concrete Shear Wall (CRCSWs) ; Torsional Performance ; Failure Mechanism
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