Gensler/Michael Willis/Kwan Henmi
600 California Street, Floor 1100
San Francisco, CA 94108
September 25, 1998
Prepared by: Steven Hergert
Subject: Moscone Center Expansion Project - Phase III
Project Number: 01.6250.000
Structural Coordination Meeting, Sep 24, 1998
Meeting Notes..... #63
Present
- FBA.................................. Not Attending
- SDE.................................. Jack Laws (JL)
- SDE.................................. Jon Andrews (JA)
- JV Team/Gensler.............. Peter Schlosser (PS)
- JV Team/MWA................. Steven Hergert (SH)
- JV Team/KHA.................. Ivan Romero (IR)
Discussion
- Penetrations (for mechanical ducts) through structure at Brace line B
were discussed. A&P confirmed (via phone conversation with IR during
meeting) that 2'- 11" clear is not sufficient space for their ducts. SDE
will lower bottom members of engaged trusses 6" min. See attached
diagram.
Action / Decisions Pending / Follow up
SDE lowering steel 6".
JV team to incorporate revisions.
JV team notified A&P of steel modification.
A&P will verify if penetrations are sufficient.
[On 980929 Kwan Henmi developing solution, per
JV Coordination meeting.]
[On 981001 Structural Consultant notified of progress at
Structural Coordination meeting.]
CC requested review and study of a modified truss bracing spacing.
Currently the 22'-6" spacing creates conflicts for mechanical duct runs.
SDE provided sketch (attached) for review by JV team. After review, the
modified spacing diagram (braces at 30' o.c.) created more obstructions
for mechanical.
Action / Decisions Pending / Follow up
After review, the modified spacing diagram (braces at 30' o.c.) created
more obstructions for mechanical.
JV team advised to not modify the framing plans.
[On 981001 a solution was not reported at
Structural Coordination meeting.]
Elevator framing was discussed. SDE confirmed framing diagrams had been
sent to JV team. JV team requested modifications to steel tube sizes.
Action / Decisions Pending / Follow up
SDE will reissue faxes sent prior.
SDE confirmed requested tube dimensions are not feasible.
SDE will provide possible sizes for IR/JV team.
[On 981001 Kwan Henmi needs information for 50% design package, reported
at
Structural Coordination meeting.]
Issues still pending:
- All parties discussed framing concepts for the Howard Street entry plaza.
SDE suggests extending basement walls to perimeter of plaza stairs. After
additional discussion at the September 24 meeting, this option was agreed
upon by all parties.
Action / Decisions Pending / Follow up
JV team to modify base files and distribute.
[On 981001 no progress reported on implementing solution at
Structural Coordination meeting.]
CC requested coordination between FBA and SDE for column locations in the
basement.
Action / Decisions Pending / Follow up
FBA and SDE to coordinate.
New drawings will be issued at 25% (September 30) deadline.
[On 981001 JV team will verify electrical equipment will fit structural
column layout, from discussion at
Structural Coordination meeting.]
Drawings of existing buildings were requested for SDE and FBA.
Action / Decisions Pending / Follow up
JV team to locate and provide copies.
JV team requested from city. Still pending.
[On 981001 initial submission of available drawings reported at
Structural Coordination meeting.]
Elevator shaft/elevator machine room framing to be resolved this week.
CC requested steel framing member and column sizes (at elevators) and
sketches from SDE by the end of the week.
Sizes still being coordinated.
JV drawings to be modified to incorporate structure.
Action / Decisions Pending / Follow up
JV team to meet with Al Williams 9/18/98.
Information to be provided to SDE/FBA.
Sketches to be provided by SDE late 9/18.
[On 981001 SDE had provided input, Kwan Henmi to resolve elevators, see
Structural Coordination meeting.]
Stair sections incorporating structure, verifying head clearances, and
locating railing to be done by JV team (KHA) and forwarded to FBA and
SDE. Still pending.
Action / Decisions Pending / Follow up
JV team to complete. (KHA)
[On 981001 Kwan Henmi target to submit information is 981019, see
Structural Coordination meeting.]
JV team showed SDE ceiling hook location options. Still pending.
Action / Decisions Pending / Follow up
JV team still reviewing.
[On 981001 Kwan Henmi submitted hang point information following
Structural Coordination meeting.]
JV team and SDE reviewed framing at mechanical shafts on Minna Street.
SDE would like to relocate framing to grid lines or slightly off center
(within the flange of the column). Still pending.
Action / Decisions Pending / Follow up
JV team will study stair and shaft layout further.
Direction on framing to be provided to SDE as soon as possible.
[On 981001 WMA will prepare a drawing to study adjustmennts needed in
structural framing, see
Structural Coordination meeting.]
With Paoletti present, SDE and JV team verified the thickened slab is
required over the chiller room for sound dampening.
Electrical floor boxes, currently sheet metal should be concrete, similar
to plumbing boxes.
Action / Decisions Pending / Follow up
SDE will confirm if concrete floor box enclosures possible.
Still pending.
[On 981001 SDE provided 150 PSF slab design; will provide alternate
design to soundproof slab for further study, see
Structural Coordination meeting.]
[On 981001 Life Safey consultant writing a letter on requirements for
floor boxes; alternate designs for fireproofing will be developed, see
Structural Coordination meeting.]
CC recommends suspended elevator pits to be concrete.
Action / Decisions Pending / Follow up
SDE to note in design and JV team to incorporate into plans and sections.
Still to be incorporated.
[On 981001 SDE will submit design OA 981006. see
Structural Coordination meeting.]
FBA provided a detail illustrating the transition between the sandwich
slab and the composite mat and topping slab.
JV team will create plan diagram showing extent of sandwich slab vs.
composite slab. Above information to be used in generating a cost study
of the proposed alternate.
Action / Decisions Pending / Follow up
FBA suggested a reduction in the 2'-6" rock section as a reduction
alternate in lieu of eliminating the rock entirely.
JV team will study options.
Issue still pending.
JV team to illustrate scope of "stepping" required with option.
[On 981001 coordination needed on impacts of design changes to floor
slab. see
Structural Coordination meeting.]
FBA proposed options for clarifying the support of the north pre-function
window wall.
Connections between the window wall frame and the gravity column will be
slotted.
Coordination still pending.
Action / Decisions Pending / Follow up
JV team confirmed the column and the window wall support steel connection
will be clad/covered.
Details to be provided by JV team.
[On 981001 JV team will prepare details. see
Structural Coordination meeting.]
Currently there is no direction structurally for the exterior wall near
the existing mechanical building.
Action / Decisions Pending / Follow up
JV team to study and provide direction.
Issue still pending.
[On 981001 Consideration to moving building 1.5' at
Structural Coordination meeting.]
Thermal expansion, related to the 100 degree figures provided by A&P,
would translate to 2 1/2" of building "expansion" over the full width of
the building (along 4th Street).
FBA recommends thermal joints where structural systems change.
Issue still pending.
Action / Decisions Pending / Follow up
JV team recommends a second look at the 100 degree figure by A&P.
JV team will consider recommendation and respond.
FBA to confirm 100 degree
[On 981001 there was consideration of this subject at
Structural Coordination meeting.]
JV team to provide SDE with proposed damper relocations for SDE
incorporation. Proposal provided.
Action / Decisions Pending / Follow up
SDE to incorporate revisions
[On 981001 information was provided, and more to follow for lines A, 1
and 6, as reported at the
Structural Coordination meeting.]