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Seismic Performance of Partitions in RC Buildings

Kazerounian, Alireza | 2018

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  1. Type of Document: Ph.D. Dissertation
  2. Language: English
  3. Document No: 51458 (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. Many reinforced concrete frame buildings with masonry partitions have been built all around the world. Observations from past earthquakes show that the partitions can endanger the life of buildings occupants and lead to significant damage and loss. Failure of the partitions can be caused by dynamic vibrations and in-plane and out-of-plane loads/displacements. The interaction between in-plane and out-of-plan behaviors and location of partitions, nonlinearity and higher modes of the structures could affect the out-of- plane seismic demands on partitions. Therefore, there is a need for a comprehensive assessment in order to limit the loss in buildings with masonry partitions. This research involves assessing the seismic performance of partitions made of the hollow brick. 315 models containing regular reinforced concrete special moment frames with different number of stories, and support for some partitions in different locations and bays, were developed and subjected to a suite of 7 appropriate earthquakes. A fiber based finite element program, OpenSees platform, was selected for use in this thesis to enable nonlinear modeling of the structure, partition and nonlinear seismic response history analysis. A macro-modeling approach, based on a diagonal element and small displacement theory, was adopted for partitions according to the PEER 2008/10. The average of the peak of responses of partition, for each seismic excitation, was computed for any model. The forces obtained using the analytical method, which some of them verified with existing study results, were compared with the values from the code and a factor denoted as seismic force modification factor, , was proposed. A parametric study has been undertaken to investigate the effect of dominant parameters such as the location of partitions, length to height ratio of partition, frequency ratio of partition, and the number of stories of building on this factor. The results demonstrate that the analytical seismic demands on partitions mounted on the lower half of the structures, except the first story, are higher than those calculated using the code because of the effect of higher modes of the supporting structures. Moreover, the seismic demands on partitions located farther away from the center of the story increase due to having more axial forces generated from torsion. Finally, the coefficient and regression relationship is proposed to represent seismic force modification factor for the partitions
  9. Keywords:
  10. Seismic Demand ; Partition Functions ; Out of Plane Stress ; In-Plane Behavior ; Seismic Performance ; Reinforced Concrete Frame ; Frequency Ratio ; Partition Location ; Length to Height Ratio

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