Feb 23, 2010 - AgendaWe have 1.5 hrs, so lets tentatively plan to limit each topic to about 20 minutes.

A) in-person mtg April - Bruce to work on draft agenda and schedule and email invitation to TTT (BRUCE) April 12,14,or 16

B) advantages/disadvantages/versatility of existing hysteresis models for Beams with hinges and beams with Zero length elements. Should we include large deformations. Do we want to archive one opensees model as "baseline-1.0"? Which one? (MANNY AND WEIAN to lead)

Beams with hinges on top floorZLE for footingsTransformation command (linear, p-Delta, full)

C) next steps for analysis (ALL)-- ground motion selection update-- divvy up the parameter space for parametric studies ---------foundation hysteresis effects---------M1, M2, T1, T2, Cy1, Cy2,.....---------asymmetry in the yield criteria – no equal displacement rule?--deadline for first results. --more complicated structure simulations

D) Planning for experiment (BRUCE to lead)1) complete 1st phase of parameter studies

1b- personnel training at centrifuge2) find phenomena from analysis that warrants experimental investigation3) design experiment to investigate phenomena - ground motions, adjustable structures -- experiment with adjustable hinges (spring loaded clamps)4) shop drawings for model structures5) fabricate 6) test7) data report/archive8) verification of analysis

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Agenda – last mtg with TTT1:00 Bruce: Overall Goals, Task 1 (centrifuge testing) (30 min)• Tara: concepts for designing small scale realistic bldgs and

description of task 2 (15 min). Pretest modeling in opensees. • Mark: Task 3 (Development and verification of simplified

design tools). Inelastic spectra for rocking systems. New way of characterizing ground motion. (15 min)

• Sashi: ground motion selection for sim and exp., significance of vertical shaking in last system test, (15 min)

• Discussion (15 min)2:30 Break and Tour of facility (30 min)

3:00 Technology Transfer team input (5 min each)– priorities, cautions, what can project accomplish to help code

development progress– TT members describe how they could help project be effective

4:00 Bruce: Project Schedule and next meetings

Draft email to TTT• An email sent prior to the last meeting• Hi,

Here are some materials for our meeting in Davis on this Wednesday, Oct 14. We are hoping that all the PI's, all the students, and 4 of the 6 tech transfer team members will be in attendance (three in person and one by webex).

In the 2-page document titled Oct_14_Kickoff.... you will find a very brief summary of the goals, approach, team, and some candidate "research questions" that will drive the research. There is a request that each person in attendance list two research references that are "highly recommended" reading for the research team. The Kickoff document is a kind of whitepaper that will drive the research direction. A main goal of the meeting is to get Tech transfer team input and produce a revised and improved whitepaper. The kickoff document also contains an agenda for the meeting.

Also you will find attached another copy of the NSF proposal project description and a map to the centrifuge facility, where we will hold the meeting.

See you on Wednesday at 1 pm!Bruce

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Tech Transfer Team,Hi again - I cannot believe it has been nearly 6 months since our project was funded!We are hoping to assemble the TTT to review our progress and evolution of our plans for simulations and testing. I am attaching a powerpoint presentation summarizing the discussion from the last meeting and describing some progress of the project to date.

We are hoping to get some substantial early input and involvement from TTT (Technology Transfer Team) and therefore, we request the honor of your presence on the afternoon of April x, or x (12 noon-5:00 pm) at a meeting in Davis. Please let me know, as soon as possible if you can or cannot attend in person or by telecon.-Bruce Kutter

Below is a draft agenda for the Oct 14 meeting Suggestions for additions to the agenda welcome.

Agenda – April 12, 14, or 1612:00 lunch served12:30 • Bruce: welcome and agenda review, schedule of project and

testing (15 min) • Weian, Manny, Tara, Mark, Mark M. (15 min each):

– -describe the opensees model; present the results from superstructure parameter studies; results from foundation parameter studies; in light of numerical results, how do we design the experiment (Tara); impact on application of ASCE/FEMA documents (Mark), design of yielding hinges for experiments or other aspect of the experiment;

• Sashi: ground motion selection for sim and exp.(15 min)• Discussion (15 min)2:30 Break and Tour of facility (30 min)

3:00 Technology Transfer team input (10 min each)– priorities, cautions, what can project accomplish to help code

development progress– TT members describe how they could help project be effective

4:30 Bruce: Summary

2D nonlinear numerical parametric studies(This may also be what the first centrifuge test looks like.)

M2K2e,K2p

M1

Footings/col: k1e,k1p,k1u (nonlinear model with recentering)

F

x

H1

H2

Column spacing

F

x

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?).

6University of California, Davis

Parameter Value comment

M1 1

M2/M1 1.0 Potential range: 0.5, 1.0, 2.0, 4.0

T1 0.3 s Derive k1e and k2e from this and m1& m2

K1p/k1e 0.05

K1u/k1e 1

T2/T1 0.33 Derive k1e and k2e from this and m1& m2

K2p/k2e 0.05

H2/H1 1

H1/Col.Spacing 0.25

C2 0.6 Base shear Yield coefficient of the 2nd floor

C1 0.6 Base shear Yield coefficient of the 1st floor

2D Nonlinear Numerical Parametric Studies – Baseline #1

Standard plot for individual simulation

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m1

m2

base

time

m1

m2

base

time

Story 1

Story drift

Story 2

Story drift

OUTPUT FILEEcho all input params (t1, t2, m1,m2, c1 c2,h1,h2,…Max abs acc1Max abs acc2Max base accMax ____story drift (1,2)Max total drift (1,2)Max absolute vel (b,1,2)Energy dissipated for each column (all four)………

Standard plots for parametric study

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Different c1 values

T1/T2

Story 1

Story drift

Story 2

Story drift

T1/T2

Different c1 values

SOME ACTION ITEMS

• NEXT WEEK STUDENTS WILL MEET• MARCH 9 NEXT TELECON• MANNY WILL DO FOUNDATION HYSTERESIS

PARAMETER VARIATIONS• WEIAN WILL DO STRUCTURE PARAMETER

VARIATIONS• MARK WILL THINK ABOUT ASYMMETRIC

SYSTEM

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