4 Triple Friction Pendulum: Does It Improve the Isolation Performance? 35 0 0.5 1 1.5 2 2.5 3 3.5 2 4 5 7 0 6 7.5 3 1 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 optimal double FP (μ1=10.5%, μ2=10.5%) optimal triple FP (μ1=8%, μ4=8%) maxima of total bearing displacement (m) PGAopt 1.5 PGAopt PGAopt 1.5 PGAopt a b optimal double FP (μ1=10.5%, μ2=10.5%) optimal triple FP (μ1=8%, μ4=8%) PGA (m/s2) 2 4 5 7 0 6 7.5 3 1 PGA (m/s2) Tiso=3.5s, Loma Prieta, PGAopt=5m/s 2 Tiso=3.5s, Loma Prieta, PGAopt=5m/s 2 max( | üs+üg | ) (m/s 2) Fig. 4.8 Isolation performance (a) and total bearing displacement (b) of triple and double FPs optimized for Loma Prieta accelerogram scaled to 5m/s2 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 0 0.05 0.1 0.15 0.2 0.25 optimal double FP (μ1=0.5%, μ2=0.5%) optimal triple FP (μ1=0.5%, μ4=0.5%) maxima of total bearing displacement (m) PGAopt 1.5 PGAopt PGAopt 1.5 PGAopt a b optimal double FP (μ1=0.5%, μ2=0.5%) optimal triple FP (μ1=0.5%, μ4=0.5%) 2 4 5 7 0 6 7.5 3 1 PGA (m/s2) 2 4 5 7 0 6 7.5 3 1 PGA (m/s2) Tiso=3.5s, Northridge, PGAopt=5m/s 2 Tiso=3.5s, Northridge, PGAopt=5m/s 2 max( | üs+üg | ) (m/s 2) Fig. 4.9 Isolation performance (a) and total bearing displacement (b) of triple and double FPs optimized for Northridge accelerogram scaled to 5m/s2 Acknowledgements The authors gratefully acknowledge the financial support of MAURER SE. References 1. Fenz, D.M., Constantinou, M.C.: Spherical sliding isolation bearings with adaptive behavior: theory. Earthq. Eng. Struct. Dyn. 37, 163–183 (2008) 2. Fenz, D.M., Constantinou, M.C.: Spherical sliding isolation bearings with adaptive behavior: experimental verification. Earthq. Eng. Struct. Dyn. 37, 185–205 (2008) 3. Ruderman, M.: Presliding hysteresis damping of LuGre and Maxwell-slip friction models. Mechatronics. 30, 225–230 (2015) 4. Weber, F., Distl, H., Braun, C.: Dynamic characterization and isolation performance of triple friction pendulum. In: Proceedings of the 8th World Congress on Joints, Bearings and Seismic Systems for Concrete Structures (IJBRC), Atlanta (GA, USA), 25–29 September 2016 5. Weber, F., Boston, C.: Energy based optimization of viscous-friction dampers on cables. Smart Mater. Struct. 19, 045025 (11pp) (2010)
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