Structure201007.pdf
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Pobierz
July 2010
Concrete
Typical Applications that Require Code
Compliant Anchors According to ICC:
Powers Compliant
Products Have
You Covered:
• Pipe Hanging (Water &Waste)
• Sprinkler Pipes
• Ceiling Grids with Lighting
or Fans
• Air Handling Units
• HVAC Duct Work
• Electrical Wire Trays & Conduit
• Fire Alarms, Exit Signs
• Smoke Detection Devices
•Windows &Doors
• Glazing & CurtainWalls
• BeamConnections
• Shear & StemWalls
• Sill Plate and Ledger
Attachments
• Concrete FormWork
• Scaffolding, Cranes, Rails,
Fall Protection
2009 IBC
2006 IBC
2003 IBC
For further clarity on this important change,
visit
www.powers.com/icc.pdf
in regards to
this topic, theymake it crystal clear.
Powers Fasteners, Inc.
2 Powers Lane
Brewster, NY 10509
www.powers.com
P: (914) 235-6300
F: (914) 576-6483
C O N T E N T S
F
eatures
20 Barton Creek Bridge
By Mark W. Holmberg, P.E.
Rising eighty feet above the Barton Creek streambed, this three-span in-back
bridge was recommended as the most economical alternate that met unique
geometric and environmental constraints, and provided a novel gateway for the
subdivision it served. The in-back name derives from the central ins, or walls,
which rise from the triangular box to peak over each intermediate pier.
8
C
olumns
D
epartments
5 Editorial
What Business Are You In
?
By John A. Mercer Jr, P.E.
7 InFocus
Engineers Are from Aristotle
By Jon A. Schmidt, P.E., SECB
8 Guest Column
Seismic Design of Concrete Parking
Structure Ramps
Seismology Committee, Structural
Engineers Association of California
12 Structural Design
Post-Tensioned Slabs on Ground
Part 3
By Bryan Allred, S.E.
16 Structural Practices
Sea Wall Systems
By Vitaly B. Feygin, P.E.
22 Building Blocks
Service Life of a Structural Retroit
By Zachery I. Smith, P.E., Scott F.
Arnold, P.E., and Guijun Xian, Ph.D.
34 Structural Forum
The Case for System-Based
Structural Design
By Avinash M. Nafday, Ph.D.,
M.B.A., P.E.
26 InSights
Curved Steel: Means and Methods
By Erin J. Gachne Conaway, P.E.,
LEED AP and Jacinda L. Collins, P.E.
12
I
n
e
very
I
ssue
6 Advertiser Index
27 Resource Guide
(Pre-Cast Concrete)
28 NCSEA News
30 SEI Structural Columns
32 CASE in Point
20
o
n
the
C
over
The underside of Barton Creek
Bridge with struts and water
lines on overhang and twin shaft
piers in the distance. An analysis
of this bridge can be seen on
page 20 of this issue.
Publication of any article, image, or
advertisement in STRUCTURE
®
magazine does not constitute
endorsement by NCSEA, CASE,
SEI, C
3
Ink, or the Editorial Board.
Authors, contributors, and advertisers
retain sole responsibility for the content
of their submissions.
July 2010
Concrete
Erratum
In the Education Special Section of the May 2010 issue of
STRUCTURE magazine, there was an error in the table highlighting
courses available at schools not offering the full curriculum. Texas
A&M University does offer, and exceeds minimum course offering
requirements for, the Analysis portion of the
Basic Education Requirements
. A red “check
mark” should have been printed in the Analysis column for Texas A&M (
page 20
). We
apologize for this error.
I
RVINE
I
NSTITUTE
OF
T
ECHNOLOGY
C.V. Chelapati, Ph.D., P.E., F. ASCE
Est. 1973
SE License Seminars | Webcast | Nationwide-Worldwide
Offers 4 Courses for SE License | Credit or CEU’s
24 hours each | 8 Thursday evenings | Live offsite | Archived
Other license programs – PE (Civil), PEME, PEEE, SE I, Seismic and Surveying
Ph: (949) 585-9137
www.irvine-institute.org
STRUCTURE magazine
4
July 2010
Editorial
What Business Are You In
?
By John A. Mercer Jr, P.E.
CASE Chair
Author’s Note
: Because of a change in employment and subsequent resignation by Doug Ashcraft, I have recently
assumed the chair position of CASE. I would like to take this opportunity to thank him for his past committee
participation and leadership on CASE RMP committees and as Chair of the CASE Executive Committee, and
wish him well in his new endeavors. The CASE Executive Committee encourages Doug to stay engaged in our sister
organizations, NCSEA and SEI, as time allows.
Looking forward as CASE Chair, I will continue to rely upon the active
leadership and participation of CASE members to share their time,
energy, ingenuity, and expertise with our fellow structural engineers
in CASE, NCSEA, and SEI when it comes to Risk Management and
Business Practices.
As we continue to move forward, we are reminded constantly that
today’s economy has presented a daunting challenge to all of our
country’s companies, corporations, and individuals, not the least of
which includes our structural engineering irms. Firms have had to take
a hard look at themselves in structure, staff, and markets to assess their
survival potential until there is a turn around in the recent downward
inancial trends.
Traditionally, irms have been grown around Finders, Minders, and
Grinders. In the past growing economy, there was a shortage of each,
stimulating acquisitions to ill the gaps to grab market share.
Finders
are typically the irm principals responsible to feed a irm’s
hungry appetite for work.
Minders
are those few engineers that have
moved up to a project management role to maintain contact with the
client, manage irm resources including staff, and keep a project on
schedule and hopefully under budget. Finally,
grinders
include the
staff engineers and support staff that turn out the work of engineering
analysis and design, document preparation, and construction services
support. They typically include entry level engineering staff, itching to
design something.
This scenario should be familiar to you. But why is it important?
Financially, a irm must be at minimum, break-even, and proitable
by design when possible. Firm CFO’s are challenged with keeping
overhead rates in line using project multipliers as gauges to evaluate the
performance of the irm’s staff, project type, and client.
When the economic environment declines as we have recently
experienced, it may be appropriate to re-evaluate how you deine and
practice your business. Buggy whip manufacturers experienced this
sort of situation when Henry Ford automated the auto manufacturing
business. What are we missing in today’s picture? Who or what is it that
is consuming our revenues and proits? I would suggest we need to take
a look at the internal and external line items comprising our overhead.
Internally, we can include our IT needs. We depend on computers
and software just as our predecessors relied upon the pencil and
eventually calculators. But computers and software cost more than
pencils. The basis of our overhead is impacted by these types of cost
increases. Some of us have in-house IT departments while others
outsource this capability, maximizing cost eficiency. We can make a
list of our overhead line items to include equipment, software, IT staff,
communications systems, cell phones, Internet bandwidth, heat, lights,
rent, vehicles, supplies, advertising, non-billable staff time and the list
can go on and on.
One outside inluence impacting our irms today is the illusion that
BIM, perpetrated on our engineering community by the software
industry, is the ultimate answer in document preparation. BIM can
actually be a Trojan horse that will eventually erode the quality of our
work product and increase irm risk, if we continue to allow this myth
to become an unchecked part of our Culture. BIM is only a tool. BIM
causes restructuring of our production departments and puts irms
behind a new learning curve. We need to ask if it will it make irms
money or increase our risk?
Another external inluence is LEED certiication. LEED was created
by architects with intentions to provide our society with energy saving
buildings and sustainable develop-
ments. We need to evaluate the real
cost to irms and our clients. It has
become another way for a few to
extort money out of us and our
clients, as overseers of a perceived
greater good.
It is my intent that this editorial be
the irst in a series that will intro-
duce the concept of creating proit
centers out of our overhead items
while maintaining multipliers for
government audit purposes.
What if you could save just one
job in your irm? Could it be yours?
Just what business are you in?▪
STRUCTURAL
ENGINEERING
INSTITUTE
STRUCTURE magazine
July 2010
5
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Structure201003.pdf
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Structure201004.pdf
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Structure201005.pdf
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