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Optimal placement of MR dampers for 20-story nonlinear benchmark building 2003 년 대한토목학회 추계학술발표대회 대구 EXCO 2003 년 10 월 24, 25 일 장종우, 한국과학기술원 건설 및 환경공학과 석사과정.

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Presentation on theme: "Optimal placement of MR dampers for 20-story nonlinear benchmark building 2003 년 대한토목학회 추계학술발표대회 대구 EXCO 2003 년 10 월 24, 25 일 장종우, 한국과학기술원 건설 및 환경공학과 석사과정."— Presentation transcript:

1 Optimal placement of MR dampers for 20-story nonlinear benchmark building 2003 년 대한토목학회 추계학술발표대회 대구 EXCO 2003 년 10 월 24, 25 일 장종우, 한국과학기술원 건설 및 환경공학과 석사과정 조상원, 한국과학기술원 건설 및 환경공학과 박사과정 윤우현, 경원대학교 산업환경대학원 부교수 이인원, 한국과학기술원 건설 및 환경공학과 교수

2  Introduction Linear viscous dampers - The larger structural responses of the dampers ’ locations are, the more effective the devices are. - Many sequential procedures of optimal placement have been proposed. : SSA, SSSA ( T. T. Soong 2002 ) MR damper ( Magneto-rheological damper ) - More complicated control mechanism than linear viscous dampers - Very few verified and widely used methods for optimal placement of MR dampers. Proposed optimal placement methods - Similar to the sequential procedures for linear viscous dampers - The next MR damper is implemented at the location with the maximum responses.

3 MR damper model - Combination of Bouc-Wen model and linear damper ( Yoshida and Dyke 2002 )  Proposed optimal placement method f : control force produced by damper u : effective voltage v : command voltage

4 - Dynamic characteristics of MR damper - Maximum capacity : 1000kN Maximum command voltage : 10V - Control algorithms · Passive control : Passive-On and Passive-Off · Semiactive control : Maximum energy dissipation algorithm

5 Optimal placement of MR dampers - Linear viscous damper : Optimal location index ( T.T.Soong 2002 ) : The coefficients of each responses are not yet determined. - MR damper : Consider only one of the structural responses for the optimal location index · Peak interstory drift · Peak interstory velocity · Absolute acceleration : Then, determine the coefficients and propose the optimal location indices.

6  Numerical results Building models - 20-story nonlinear benchmark building ( Otori et al. 2000, 2002 ) - Plane :  (m) - Height : (m) - Two basement levels - 5 bays in the N-S direction and 6 bays in the E-W direction

7 - 3 DOFs at each node (horizontal, vertical, rotational) : Total DOFs: 414 (138 nodes) - MR dampers are implemented throughout the N-S frames. - Rayleigh damping matrix - Inelastic behavior of the building during strong earthquakes : Bilinear hysteresis model Peak accelerations of applied earthquakes El CentroHachinoheNorthridgeKobe Peak acc g0.230 g0.844 g0.834 g g : acceleration of gravity

8 Optimal locations of MR dampers (Passive-On algorithm) - Optimal location index ( Interstory drift ) : Before normalization of earthquakes ’ scales El Centro No. of dampers Floor No. Northridge No. of dampers Floor No. Kobe No. of dampers Floor No. Hachinohe No. of dampers Floor No.

9 : After normalization of earthquakes ’ scales El Centro No. of dampers Floor No. Northridge No. of dampers Floor No. Kobe No. of dampers Floor No. Hachinohe No. of dampers Floor No.

10 El Centro No. of dampers Floor No. Northridge No. of dampers Floor No. Kobe No. of dampers Floor No. Hachinohe No. of dampers Floor No. - Optimal location index ( Interstory velocity ) : Before normalization of earthquakes ’ scales

11 El Centro No. of dampers Floor No. Northridge No. of dampers Floor No. Kobe No. of dampers Floor No. Hachinohe No. of dampers Floor No. : After normalization of earthquakes ’ scales

12 .Int. driftInt. velocityBenchmark El Centro J J J Hach. J J J North. J J J Kobe J J J · J1 : max. int. drift · J2 : max. abs. acc. · J3 : max. base shear - Comparison of evaluation criteria · Damper locations in the Benchmark problem Floor No.12~34~20 No. of dampers421

13 Optimal location index : Absolute acceleration : Graph of evaluation criteria …… Eval. criteria No. of dampers - El Centro earthquake : Optimal placements Eval. criteria No. of dampers : Graph of evaluation criteria …… - Kobe earthquake : Optimal placements J1J2J3

14 - - El Centro earthquake · Interstory drift index : 25 dampers only on the first floor · Interstory velocity index : 25 dampers only on the 20th floor Optimal locations of MR dampers (Passive-Off algorithm).Int. driftInt. velocityBenchmark J J J Kobe earthquake · Interstory drift index : 25 dampers only on the 19th floor · Interstory velocity index : 25 dampers only on the 20th floor.Int. driftInt. velocityBenchmark J J J

15 Optimal locations of MR dampers (MEDA algorithm) - Optimal location index ( Interstory drift ) El Centro No. of dampers Floor No. Northridge No. of dampers Floor No. Kobe No. of dampers Floor No. Hachinohe No. of dampers Floor No.

16 El Centro No. of dampers Floor No. Northridge No. of dampers Floor No. Kobe No. of dampers Floor No. Hachinohe No. of dampers Floor No. - Optimal location index ( Interstory velocity )

17 .Int. driftInt. velocityBenchmark El Centro J J J Hach. J J J North. J J J Kobe J J J · J1 : max. int. drift · J2 : max. abs. acc. · J3 : max. base shear - Comparison of evaluation criteria · Damper locations in the Benchmark problem Floor No.12~34~20 No. of dampers421

18 Passive-On algorithm - Peak interstory drift index is the most efficient in most cases. - Peak interstory velocity index is not very efficient. - Peak absolute acceleration is inadequate for the optimal location index. Passive-Off algorithm - MR dampers are implemented only on one floor. - The proposed sequential method is not adequate for Passive-Off algorithm. Maximum energy dissipation algorithm - The optimal locations of MR dampers are similar to those under passive-on algorithm.  Conclusion


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