Meeting Notes 1-30-02 V-03 approved.pdf - Structural Engineers ...

SEAOSC Seismology Committee
Meeting Notes
January 30, 2002
Page 1
Structural Engineers Association of Southern California
Seismology Committee
Meeting notes
January 30, 2002
Approved June 26, 2002
Bob Lyons
Martin Johnson
Rami M. Elhassan
Carl Sramec
Peter Maranian
Mehran Pourzanjani
Attendees listed above
Saiful Islam
Saif M. Hussain
Ajit Randhava
Sampson Huang
Attendees:
Distribution:
Martin B. Hudson
Attila B. Beres
John Kariotis
Graeme Dick
Said Hilmy
Martin Graves
Bill Nelson
Bob Bachman
David Nakaki
John Whisenand
Y. Henry Huang
Meeting Location:
Meeting Time:
Law Crandall's office
The Citadel, 200 Citadel Dr.
Los Angeles, CA 90040-1554
Tel: 323-889-5300
4:00 to 6:00 pm
Notes:
Open meeting at 4:15 p.m. with introductions. R. Lyons (RTL) Chair.
1. 11-28-01 Draft Meeting Note reviewed. Following Corrections required:
A. Item 6F - ASCE needs a major update
B. Item 6G- Revise to “J. Kariotis suggest considering drift limit – major diff. Between IBC + UBC -
IBC draft limits are larger than UBC.”
C. Item 6J- Revise to “R. Lyons to ask John Lawson attend SC meeting. JL is SEAoC-SC Tilt-up
subcommittee chair.”
Kariotis moved to approve minutes with these corrections made. M. Johnson seconded.
Minutes approved as corrected.

SEAOSC Seismology Committee
Meeting Notes
January 30, 2002
Page 2
2. Action Items from last meeting.
A. In response to request for white paper topics, several topics were submitted.
B. Subcommittee co-chairs.
• Concrete subcommittee co-chair required. Martin Graves volunteered.
• Wood – new chair, co-chair and members probably needed. Wood issues are
considerable. R. Lyons will follow-up.
• Masonry co-chair J. Kariotis has not found a co-chair yet. Will continue to look.
C. NEHRP balloting. Comments sent in (R. Lyons). Unable to coordinate with State SC, but R.
Lyons was able to discuss and coordinate with SEAoCC Seismology Committee.
D. R. Lyons- Group email address is now available.
3. Discussions concerning meeting minutes.
A. R. Lyons proposed writing minutes citing the commentator. Also minutes will be posted to
SEAoSC-SC web site once approved.
B. S. Hilmy asked what are the reasons for citing commentator and posting on web site R. Lyons
responded that activities of committee should be public. M. Johnson added that use of
commentator’s names is the tradition of Seismology Committee. G. Dick noted that the minutes
reflect the individual’s opinion unless voted upon by the Committee.
4. White Paper
A. R. Lyons- Seminar steering committee requests SC make PD&D and other presentations. We
can then take 35 minute topics from each white paper.
B. M.Johnson- The Blue Book may in the future be a series of white papers instead the
traditional commentary on code point by point.
C. R. Lyons- The white papers may go in Blue Book. They will be distributed on web site.
D. M. Johnson- topics should be prioritized. RTL will prioritize and refine topic based on today’s
discussions.
5. White paper topics
A. Steel, fireproofing on steel braced frames.
• An approach was presented that would allow some braces not to be fireproofed.
• After discussion, it was decided that SC would not address this topic. This topic might be
good for the code committee and will be forwarded.

SEAOSC Seismology Committee
Meeting Notes
January 30, 2002
Page 3
B. Steel, column moment magnification.
• Issue relates to magnification of column moment owing to higher mode response and
effect on assumed strong column-weak beam moment frames.
• This is a systems issue related to materials other than steel as well.
• M. Johnson- Beam-column moment magnification is the main issue. Is 1.5x stronger good
enough Maybe ratio of 2 is better.
• P. Maranian- Connections haven’t been tested sufficiently to understand column yielding
behavior.
• Proceed with abstract.
C. Systems, considerations assessing R values for new systems.
• M. Johnson- Should BSSC be involved They discussed recently, and they will review.
Test criteria was also addressed. NEHRP has many different test criteria. An ATC report
discussed components of R factor.
• Proceed with abstract.
D. Systems, Behavior of collector and boundary elements in rigid diaphragms..
• Code doesn’t describe and many engineers don’t consider adequately. There are some
papers. Maybe do FE analysis. Set simple rules.
• Proceed with abstract.
E. Foundations/ground motion, inconsistency between ASD and Strength design uplift
calculations.
• State foundation committee addressing this issue.
• Support state effort.
F. System and Foundations, slab-on-grade diaphragms.
• Shear transfer from superstructure to foundations using slab-on-grade as a diaphragm.
Design procedures not addressed by code.
• Proceed with abstract.
G. Systems, review irregularity provisions, tables and triggers for dynamic analysis.
• UBC and Title 24 should be consistent, but the rules are very different.– don’t make
same.
• Proceed with abstract

SEAOSC Seismology Committee
Meeting Notes
January 30, 2002
Page 4
H. Systems, redundancy for mixed systems
• SEAoSC Steel ad hoc committee is looking at this.
•
I. Seismic isolation, energy dissipation, Passive damping
• NEHRP has simplified static procedure (Appendix) for chapters. It is being considered
for chapter, but there are very few case studies.
• Proceed with abstract.
J. Light frame, definition of light frame and acceptable combinations of materials/systems.
• A commentary on which combinations are acceptable.
• As an example, can pneumatically driven “nails” be used to attach plywood to light steel
• Proceed with abstract.
K. Light frame, Definition of nominal strength and elastic stiffness.
• ASCE-16 doesn’t have definition of nominal strength. The “nominal load” is defined.
“reference strength,” “design strength” are defined. Suggestion for us to define “nominal
strength” and “elastic stiffness.”
• Proceed with abstract.
L. Light frame, considerations for assessing φ - factors.
• May depend on degree of inspection.
• Proceed with abstract.
M. Light frame, drift limits for various combinations of materials.
• Expand on IBC 2000, Table 1617.3.
• Proceed with abstract.
N. Light frame, short shear walls and guidelines for deigning fixity at floor lines above foundation.
• Shear not transferred into floor.
• Proceed with abstract.
O. Concrete, Coupling beams.
• Difficulties associated with detailing and construction.

SEAOSC Seismology Committee
Meeting Notes
January 30, 2002
Page 5
• Testing last few years can be collated.
• Proceed with abstract.
P. Foundation/ground motion, load levels and soil lateral pressure.
• This may be a state foundation subcommittee task, but can start with SEAoSC.
• M Hudson to contact T. Hale of state Seismology Committee.
Q. Foundation/ground motion, Seismic increment of earth pressure
• How should this combined with code seismic design forces. Application to building and
components.
• M. Hudson to contact T. Hale of state Seismology Committee.
R. Foundation/ground motion, subterranean levels, especially partially submerged.
• Where is your seismic base Where is lateral load taken out
• One story down is often used.
• Proceed with abstract
6. Code simplification task of the Building Code Committee, presented by C. Sramec - The
code chair, Warren Minner , suggested the topic. Much positive response. People come
up with bizarre and inconsistent interpretations. Two items are being looked into.
1. Mel Greene with suggested a “code light” which is a manual for 3 stories and
below. Cross out sections that don’t apply. This would be applied to UBC. It would be
applied eventually to IBC.
S. Hilmy- Perhaps examples should be in there.
7. NEHRP 2003 proposed changes – from state committee.
M. Johnson- The ballot addressed formatting only. The document will be used as base
document for 2003 version. There are some problems with reformatted text. We should
think about changes in provisions.
8. Bob will make list of action items.
9. Meeting adjourned at 6:30 pm.
O:\SEAoSC Seismology 2001-2002\mtg 1-30-02\Meeting Notes 1-30-02 V-03 approved.doc