8I - PW Building Canopy ReplacementCITY OF ATLANTIC BEACH
CITY COMMISSION MEETING
STAFF REPORT
AGENDA ITEM # 81
MARCil 10,2014
AGENDA ITEM : Public Works Bui lding Ca n opy Replacem ent
Ri ck Carper, P.E ., Publi c Works Dire cto r ~ SUBMITTED BY:
DATE: Feb ruary 13, 2014
STRATEGIC PLAN LINK: None.
BACKGROUND: In October, aft er Staff noted significant corr os i on on vis ibl e m embers, an
eng in ee ring eva luation of the Public Wor ks building east face canopy was perform ed. The
eva luation revea led th e canopy to be i n ve ry poor condition with seve re d et erioration of beams
and co lumns and r usted are as arou nd scr ew penetr ations in the roof decl<. In telephone
conversation with th e in spect or during r eport preparation, h e urged rep laceme nt of t h e roof
b efore the next storm seas on. To get an idea of cost to perform the necess ary r epairs, Staff
consul t ed w ith Harrell Co nstru ction and request ed an in spection and quote.
The recommended repair, to remove a nd rep lace the existing ca nopy was $68,700. Less
preferred altern atives were t o 1) r emove e ntire ca nopy w itho ut re pla cement -$16,540; or 2) to
r emove entire cano py and rep lace o nl y th e canopy ove r t h e fueling area -$31,300.
BUDGET: Th ere are no fund s budgeted fo r a repair of this magnitude. A budge t mod woul d b e
requi red.
RECOMMENDATION : St aff reco mmends a budget modification too add $75,000 to PW Admin account
001-5001-541-4600, Repair and M a intena nc e to allow a 10% continge ncy on the pro pose d
repairs
ATTACHMENT: (1) Hurlsber g Engineering Eva luation Re port (excerpt)
ULSBERG
ENGINEERING
AGENDA ITEM# 81
MARCH 10, 2014
Residential and Commercial Structural Engineers
November 4, 2013
Mr. Ricky L. Carper, P .E.
Public Works Director/City Engineer
City of Atlantic Beach
1200 Sandpiper Lane
Atlantic Beach, FL 32233
Re: 1200 Sandpiper Lane
Public Works Maintenance Center
Dear Mr. Carper:
On the subject project, I submit the following:
I visited the Public Works Maintenance Center located at 1200 Sandpiper Lane on October 17,
2013. The purpose of the visit was to determine the structural condition of the canopies on the
east side of the building.
The open canopy structure is attached to an enclosed metal building on its east elevation. The
canopy is approximately 120' long and extends from the north end of the building south. It
extends out from the building 16' except at the fuel pump area where it extends out 32'. The
canopy is suppotied by (6) six columns bolted to the concrete foundation. The roof system
consists of light gauge zee section purlins spanning in the north south direction between steel
beams supported by the steel columns. The zee purlins support the prefinished con·ugated metal
roof deck that has been coated on the top side with a spray applied product. (See attached
photographs 1, 2 & 3)
I observed the structure from a power lift. I noted severe rusting on the top ofthe bottom flanges
of the main support beams. In the sound areas I measured the steel thickness at .23" to .25". After
scraping some of the rusted areas I measured the steel thicknesses in several locations and it
varied between 0.20" and 0.15". I found numerous severely rusted zee purlins. In several
locations sections of the bottom flange fell off when I removed some of the rust. I found
numerous locations of rusted areas at the penetration of the deck screws into the zee purlins. This
has resulted in the release of the screws and the decking is loose in these areas. Several columns
supporting the canopy were found to have severe rust damage at the base. (See attached
11481 Old St. Augustine Rd., 202, Jacksonville, Florida 32258
Phone (904) 886-2401, Fax (904) 260-4367, FL CA No. 25846
Re: 1200 Sandpiper Lane
November 4, 2013
Page 2 of2
photographs 4 through 17)
AGENDA ITEM # 8I
MARCH 10, 2014
Overall this structure is in very poor condition. In the event of strong winds from a thunderstorm
this area could collapse. The zee purlins that support the roof panels are light gauge material.
These are severely deteriorated in some locations and in my opinion cannot be repaired. The
beams and columns are deteriorated but they can be repaired by welding new steel plate to the
damaged areas. Based on the rusted areas around the screw penetrations in the roof deck it will
also need to be replaced.
Conclusions:
The roof deck and zee purlins supporting the roof will need to be replaced. Although the steel
beams and columns are repairable, it may not be a cost effective solution. To prepare the steel for
repairs and painting, a white metal sandblasting (SSPC-SP-5) would be required. This would be
followed by the repairs and a paint system designed to resist the exposed environment in this
location. This type of surface preparation and paint system can be very costly on site. It may be
less expensive to replace the whole system with new material and a shop applied paint system
that is specified for this exposure. I would suggest metal building manufacturers as a provider for
this type of structure.
Photograph: 8
Description:
Rusted top flange of
steel beam.
Photograph: 9
Description:
Rusted bottom
flange and
connection at
column.
2/13/2014
AGENDA ITEM # 81
MARCH 10, 2014
1
Photograph: 11
[)escription:
lusted top tlunge at
·oof deck screw
Jenetration.
Pbotograpb: 13
Description:
Severe deterioration
of zee section purlin
2/13/2014
AGENDA ITEM# 81
MARCH 10, 2014
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