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Planning for next CoSSY Team meeting, early January on Schedule, Status, Progress, Plans,………

Planning for next CoSSY Team meeting, early January on Schedule, Status, Progress, Plans,………. B Kutter December 2009. Draft Agenda – January Meeting. Update from students Weian and Manny to make short presentations on findings from literature review

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Planning for next CoSSY Team meeting, early January on Schedule, Status, Progress, Plans,………

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  1. Planning for next CoSSY Team meeting, early January on Schedule, Status, Progress, Plans,……… B Kutter December 2009

  2. Draft Agenda – January Meeting • Update from students • Weian and Manny to make short presentations on findings from literature review • Weian and Manny to present parametric studies of 2D nonlinear SDOF • Effects of geometry, stiffness, strength • Footing hysteresis curves • Plan next mtg with Advisory Board in Feb/Mar? • Centrifuge Test • Sep or Oct 2010 • EOT • Future directions for students • Parametric studies • Centrifuge tests

  3. 2D nonlinear numerical parametric studies(This may also be what the first centrifuge test looks like.) Need to define suite of ground motions. Some may be artificial (e.g., tapered sine, wavelet), some realistic. Manny and Weian will begin parametric studies on this system. One student will focus on parametric studies of the geometry and properties of the system highlighted in sketch, and the other will focus on effect of the shape of the lower level hysteresis curve (recentering, flag, elasto-plastic, settlement?). M2 F F H2 K2e,K2p x x M1 H1 Footings/col: k1e,k1p,k1u (nonlinear model with recentering) Column spacing

  4. Proposed Parameters for 1st baseline for 2D nonlinear parametric studies

  5. Open issues and thoughts generated during recent discussions • Core set of motions needs to be selected • Artificial • Realistic • Incremental dynamic analysis • How to look at results. • Spectral plots – response parameter on y axis, f1 on horizontal axis, contours of other parameters (k1e/k2e, Fy1/Fy2,…. At least 6 other variables? Could get messy.) • Principal components analysis may be useful. • Could PCA help identify important parameters as well as response mode shapes (a la Aschheim et al 2002) https://central.nees.org/data/get/NEES-2009-0732/Documentation/Literature%20Review/Draft%20Recommended%20Papers/Ashheim-02-Multistory%20Frame%20Buildings%20Respond.pdf • Who has done parameter studies on 2DOF nonlinear systems? • Alhan & Gavin (2003) MDOF isolation systems (ideas on presentation or results of parameter study.) (attached to email) • Others?

  6. Alhan & Gavin (2003)

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