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- Type of Document: Ph.D. Dissertation
- Language: Farsi
- Document No: 52272 (09)
- University: Sharif University of Technology
- Department: Civil Engineering
- Advisor(s): Maleki, Shervin
- Abstract:
- This research introduces two new passive control devices for protecting structures against earthquakes: Dual Pipe Damper (DPD) and In-filled Pipe Damper (IPD). The DPD device consists of two welded pipes. The IPD device is a DPD with two smaller pipes inside them and the spaces between the pipes are filled with metals such as, lead and zinc. The DPD device only utilizes plastic deformation of pipes; but the IPD device takes advantage of plastification of the outer and inner pipes, the in-filled metals, and the friction between metals as energy absorption mechanisms. Quasi-static cyclic tests are performed on four specimens of DPD and six specimens of IPD all showing stable hysteresis and high damping. A finite element model is developed and calibrated against test results. The model is used to find the optimum sizes of pipes needed for a better hysteretic response. Equations are given for prediction of key performance parameters of two proposed dampers. Finally, the performance of the proposed dampers in three structures was investigated under seven different earthquake excitations. Both two dampers showed an excellent performance under seismic loads in all three structures and absorbed a considerable portion of seismic input energy. As a result, the absorbed energy by and damage to main frames of structures decreases significantly through adding proposed dampers
- Keywords:
- Yielding Damper ; Hysteresis Behavior ; Optimization ; Nonlinear Behavior ; Cyclic Test ; Nonlinear Analysis ; Pipe Damper
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