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Seismic Performance Assessment of Bridges Equipped with Shape Memory Alloy Added Base Isolation Bearing

Hosseini, Alireza | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 48736 (53)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Rahimzadeh Rofooei, Fayyaz; Jahanshahi, Mohsen
  7. Abstract:
  8. Seismic performance analysis is conducted for an isolated three-span continuous highway bridge, which is restrained with shape memory alloy bar. Two series of earthquake ground acceleration, known as ‘pulse records’ and ‘non-pulse records’ are applied to the bridge in three directions. Four types of pier-girder connection are used in the analysis: rigid connection (only for comparison), lead rubber bearing system (LRB), lead rubber bearing along shape memory alloy (SMA) restrainer system and high damping rubber bearing (HDRB) system. SMA bar restrainer is made of Ni-Ti. In the first step of the work, structural properties and analytical models of the bridge segments are introduced. Then, a 3-D three-span continuous highway bridge is modeled and modal analysis is operated to determine period of the bridge. Seismic performance of the modeled isolated bridge is evaluated, using SeismoStruct’s Dynamic time history analysis. This study shows that the seismic responses of the bridge are affected by the use of shape memory alloy restrainer; more specifically, residual displacement of the bearings are noticeably reduced after earthquakes in case of LRB along SMA restrainer compared to LRB and HDRB; however, deck acceleration are larger in the case of LRB plus restrainer, but not significant. Deck displacement decreased by using of SMA restrainer, depends on the forces applied to the connections in order to phase transformation accrued in SMA. In case of larger PGA, the system shows better results, and by decreasing the SMA restrainer cross-section the system is more efficient both in functionality and cost
  9. Keywords:
  10. Shape Memory Alloy ; Nonlinear Time History Analysis ; Nonlinear Dynamic Analysis ; Seismic Performance ; Base Isolation ; Restrainer

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