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Influence of Floor Diaphragm on Seismic Response of RC Structures

Masoumi, Hassan | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45060 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Khaloo, Alireza
  7. Abstract:
  8. Modeling is one of the most important steps in analysis and design of structures. Most of the time behavior of floor diaphragms is assumed completely rigid in their plane in order to simplicity in practical design. Although this assumption leads to acceptable results in analysis and design of conventional buildings, erroneous results may assess in some particular buildings—for instance narrow buildings with stiff end walls. Accordingly, behavior of these buildings in future earthquakes opposes those were predicted in design phase, and they are so vulnerable since in-plane deflection of floor diaphragms are striking which cannot be ignored. This thesis investigates the significance of in-plane floor flexibility on seismic response of reinforced concrete structures. Experience with past earthquakes demonstrates that this feature is particularly important for long, narrow buildings with stiff end walls. All models are analyzed by using nonlinear static and nonlinear dynamic analyses in which influence of such parameters as diaphragms thickness, plan aspect ratio, and openings on flexibility of diaphragm as well as seismic response of structure are studied.The study shows that in-plane floor flexibility increases by decreasing diaphragm thickness as well as by increasing openings and plan aspect ratio. Also nonlinear static analyses illustrate that although in-plane floor flexibility has enormous effect on pre-yielding part of pushover curve, it has no influence on post-yielding part of that. Thus rigid diaphragm assumption causes some error in calculating of yield displacement and effective lateral stiffness. Furthermore lateral displacement and shear force of middle frames is miscalculating
  9. Keywords:
  10. Diaphragm ; Nonlinear Analysis ; Concrete Structures ; In-Plane Flexibility ; Rigid Diaphragm

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