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Nonlinear Seismic Interaction Behavior of Concrete Shear wall-Frame with Different Stiffness Ratio of Wall and Frame

Taheri, Abbas | 2007

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41787 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Khaloo, Alireza
  7. Abstract:
  8. Wall-Frame interaction under lateral load has been considered in studies, and it is concluded that interaction lateral forces of rigid frame and shear wall varies at different stories. This is resulted from of different mode shape of rigid frame and shear wall under lateral loads which are shear and bending mode, respectively. However most codes recommend a minimum strength for frame, equal to 25% of total lateral force, as an acceptance criterion of shear wall-frame dual action; otherwise this minimum strength does not fully comply with horizontal distribution of lateral load according to relative stiffness of components.The purpose of this article is to study nonlinear seismic response of wall-frame structures with consistent total stiffness and different relative stiffness of wall and frames. Four, eight and twelve story RC structures with rigid simply connected beams between wall and frames at all stories are modeled. These models, with different wall-frame relative stiffness ratio ranging from 90-10 to 20-80, are analyzed and designed according to linear dynamic procedure of UBC 97.All models’ design are based on dual system coefficient(R), without consideration to the frame minimum required strength. This allows investigating dual action limits of codes. The advantages of nonlinear behavior of reinforced concrete sections and their energy dissipation in cyclic loading are taken into account; stiffness and strength degradation are also considered in nonlinear analysis of models.This study try to find relative stiffness ratios for frame in wall-frame structures which lead to safe and best nonlinear performance at different level of hazard. An optimum relative stiffness ratio with good performance and minimum material usage is also in scope of study. Consistent total stiffness of structure is defined as sum of frame and wall stiffness; this definition allows observing the different relative stiffness effects on wall-frame stiffness. Methods to define wall, frame and wall-frame stiffness in multistory structures are discussed extensively. Results of design and nonlinear analysis are discussed and plotted in diagrams. Nonlinear to linear displacement ratios are compared to selected structural system coefficients(R) in tables. Based on the result of this study the minimum frame strength equal to 25% of lateral forces is not exact and it could be decreased safely, however the best performance would be possible with higher ratios
  9. Keywords:
  10. Concrete Shear Wall ; Concrete Frame ; Nonlinear Analysis ; Seismic Design ; Shearwall-Frame Interaction

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