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Evaluation of Demand Modifier Factor ,M, in FEMA356 for Concrete Structures Under Near-Field Earthquakes

Mohhamad Rahimi, Majid | 2008

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 39261 (53)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Rahimzadeh Rofooei, Fayyaz
  7. Abstract:
  8. On the average, ten thousand people die annually due to earthquakes. A UNESCO study gives damage losses amounting to ten billion dollars within the years 1926 to 1950 from earthquakes. These data shows the importance of earthquake issue that causes the scientists to pay special attention to this subject. In despite of significant improvements in many of scientific fields, earthquake is still remains as an unknown event without the possibility of predicting its time and location of occurrence. Because of that, a large effort has been paid for rehabilitation of structures to prevent the human loss and maintaining the necessary life safety. In this regard, various guidelines have been proposed by governmental institute. FEMA 356 being the most prominent one to be referred to. In this work, the proposed m-factor in FEMA356 for concrete structures will be evaluated using Near Field earthquake records. For this purpose, a number of 3-D structural models with different number of stories and several levels of eccentricity will be considered. Then, using linear and nonlinear dynamic time history analysis, the m coefficients are determined for the aforementioned models under near field earthquake records. Finally, the recommended m-factors in FEMA 356 are compared with those obtained from this study. ACI code is used for the design of the considered concrete structural models. Also, SAP2000 is considered for the modeling and numerical analysis. For numerical part, seven couple of near field earthquake records are used in performing the linear and nonlinear time history analysis. The obtained results show the sufficiency of the proposed FEMA356 m factor for retrofitting the concrete structures under near field earthquakes
  9. Keywords:
  10. Performance Based Design ; Nonlinear Time History Analysis ; Ground Motion Scaling ; Linear Time History Analysis ; Demand Modifier Factor

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