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Performance Assesment of Ordinary Structures with Concrete Bearing Wall by Endurance Time Method

Fahimi Farzam, Maziar | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40490 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Esmaeil Pourestekanchi, Homayoon
  7. Abstract:
  8. In high seismically active regions, such as Iran, shear walls are one of the preferred seismic force resisting system.The efficiency of reinforced concrete bearing walls for resisting lateral forces and controlling lateral drift in high-rise buildings has long been recognized. But in recent decades shear wall dominant buildings or so called tunnel form buildings have been increasingly constructed as the multi-story reinforced concrete buildings. The purpose of this thesis is to assess the seismic performance of concrete shear walls that provide gravity as well as sesmic resistance for this kind of buildings. The studied walls were assumed to be part of 5- 10- 20- and 40- story residential buildings located in Tehran and twelve 2D models have been analyzed. To identify their most essential parameters such as confinement effect, axial load ratio, aspect ratio, strength degradation and higher mode effect, linear and nonlinear dynamic and static analysis were conducted on the backbone of performance based design methodology based on ASCE41 standard and new finding about modeling of inelastic shear deformation in this standard have been reviewed. At last a 3D model has been used to facilitate the investigation on impacts of wall-to-wall interactions on the performance. To reduce the computational effort required in time history analysis a new method named Endurance Time analysis in seismic assessment of bearing wall in nonlinear range is investigated. Endurance Time analysis is based on time history analysis but in this method structure is subjected to an intensifying acceleration function and different damage indices of the structure such as plastic hinge rotation and drift are evaluated through analysis time. This method can be a useful tool for executing Performance Based Design of structures.
    The results indicates that with increasing height of models the shear force demand exceeds the values predicted by the linear analysis, and plastic hinge formation above the base may be expected. The large differences between the predicted and designe demands is due to an underestimation by the spectral response acceleration of the higher mode effects in a cantilever wall system.
  9. Keywords:
  10. Performance Based Design ; Bearing Capacity ; Endurance Time Method ; Confinement ; Higher Mode Effect

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