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RUTHERFORD & CHEKENE October 9, 2010

PEER/NEES Column Blind Prediction Modeling Approach. RUTHERFORD & CHEKENE October 9, 2010. Background. Thanks: José Restrepo , Stephen Mahin, PEER, NEES Great opportunity for practitioners Benefit to our practice Colleagues:

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RUTHERFORD & CHEKENE October 9, 2010

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  1. PEER/NEES Column Blind Prediction Modeling Approach RUTHERFORD & CHEKENE October 9, 2010

  2. Background • Thanks: • José Restrepo, Stephen Mahin, PEER, NEES • Great opportunity for practitioners • Benefit to our practice • Colleagues: • Joe Maffei, Karl Telleen, Marko Schotanus, Andreas Schellenberg • Preliminary Model • SAP2000 v14.1 • Elastic frame element with cracked stiffness properties • Two concentrated plasticity fiber hinges • 6 EQ run time  10 hours RUTHERFORD & CHEKENE

  3. SeismoStruct Fiber Model • Force-Based Frame Element (infrmFB) • 1 frame element • Unconfined cover concrete, confined core concrete, longitudinal reinforcing materials • 700 fibers • 10 integration segments • Force-based element • No discretization • Exact solution • Global damping parameters RUTHERFORD & CHEKENE

  4. Material Models • Unconfined Concrete (con_tl) • TrilinearConcrete: • f’c = 6 kip/in2 • Ec = 4,400 kip/in2 • Confined Concrete (con_cc) • ManderNonlinear Constant Confinement Pressure Concrete: • Peak Strain = ec= 0.003 • Mander Confinement kc= 1.2 • Longitudinal Reinforcing Steel (stl_mn) • Menegotto-Pinto Steel with post elastic buckling: • fy = 75 kip/in2 • Transverse steel spacing and size RUTHERFORD & CHEKENE

  5. Damping • Damping Model • Rayleigh, mass proportional, stiffness proportional? • How much equivalent viscous damping, z? • Initial Stiffness, tangent stiffness? • Previous Research on Bridge Piers • Sakai , 2007 • Failure: longitudinal bar buckling/fracture • Elastic Response: z = 2% Rayleigh • Inelastic Response: z = 0.1% Rayleigh • Priestley, 2007 • Failure: longitudinal bar buckling/fracture • Damping: z= 2.0% tangent stiffness orno elastic damping • Lessons • Damping, materials, failure modes • From Priestley et al, 2007 RUTHERFORD & CHEKENE

  6. Ground Motions • Time Series • Residual displacement offset • Baseline correct? • Filter? • Result • Minimal difference in peak results RUTHERFORD & CHEKENE

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