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Interaction Effects of Gravity and Lateral Loads in Reinforced Concrete Slab

Hosseinalizadeh, Amir | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 50866 (53)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Kazemi, Mohammad Taghi
  7. Abstract:
  8. Reinforced concrete slabs carry both vertical gravity loads and in plane forces due to seismic loads. In this study interaction of bending and in plane forces will be considered. Lee et al. in 2007 studied the floor diaphragm behavior. They considered combination of both in plane and out of plane loadings. In the most previous studies, the diaphragm behavior of a floor slab was represented by its behavior under in-plane forces only. With this assumption, analysis of the floor diaphragm was simplified to the two dimensional plane stress problem. For low-rise buildings, the lateral stiffness of the structure is usually higher than high-rise buildings.Tena et al. in 2014 assessed ment the diaphragm condition for floor systems used in urban buildings. Their study shows that floor systems that behave reasonably as rigid diaphragms when the floor spans are not very large , 6 m or less , commonly used in apartment buildings. However, this observation cannot be generalized, because other design practices may favor the presence of semi-rigid, semi-flexible or flexible diaphragms, particularly for floor spans of ,10 m , or more, frequently used in office buildings.Moehle et al. in 2010 studied that building structures generally comprise a three-dimensional framework of structural elements configured to support gravity and lateral loads. Although the complete three-dimensional system acts integrally to resist loads, we commonly conceive of the seismic force-resisting system as being composed of vertical elements, horizontal elements, and the foundation. The vertical elements extend between the foundation and the elevated levels, providing a continuous load path to transmit gravity and seismic forces from the upper levels to the foundation. The horizontal elements typically consist of diaphragms, including collectors. Diaphragms transmit inertial forces from the floor system to the vertical elements of the seismic force-resisting system. In this study the combined actions of flexural moments from gravity loads , and in plane forces resulting from lateral seismic load will be studied. At the first step existing building codes (ACI 318) and relevant references will be studied. In the next step different models of diaphragms will be analyzed using appropriate software’s , to study the effect of various parameters such as: aspect ratio, size and geometry of slab panels
  9. Keywords:
  10. Slab ; Lateral Loading ; Concrete Slabs ; Earthquake Load ; Diaphragm ; Rigid Diaphragm

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