HomeMy WebLinkAboutTrans 2015-04-06 Item 2B - Discussion - 2015 Annual Bridge Inspection and Repairs - South 119th Street Pedestrian Bridge Repair and Replacement OptionsTO:
City of Tukwila
Jim Haggerton, Mayor
INFORMATIONAL MEMORANDUM
Mayor Haggerton
Transportation Committee
FROM: Bob Giberson, Public Works Director 4g6
BY: Grant Griffin, Senior Program Manager
DATE: April 3, 2015
SUBJECT: 2015 Annual Bridge Inspection and Repairs
Project No. 91510402
S 119th St Pedestrian Bridge Repair and Replacement Options
ISSUE
The timber on S 119th St Pedestrian Bridge in Allentown over the Duwamish River is experiencing deterioration and paint
failure. While the problems are currently more aesthetic than structural, a maintenance project must be developed to correct
the deterioration and protect the existing structure before the bridge's capacity is affected. Repair and replacement costs
have been prepared to aid decision making about the future of this pedestrian bridge.
BACKGROUND
The S 119th St Pedestrian Bridge was built in 1965 and has been painted and repaired during its service life with the most
recent repair completed in 2002. There is currently widespread deterioration of the top surface of the timber girders and
overall paint failure on the bridge. The bridge passes the biennial safety inspection, but aesthetically it does not inspire
confidence in its users.
DISCUSSION
David Evans and Associates (DEA) has prepared a conceptual bridge repair plan, with cost estimates, that include repair of
deterioration on the top of the girders and repainting the bridge to protect the structure and slow the deterioration process.
The proposed work is the minimum amount necessary to correct the most glaring deficiencies, however additional repairs
could be performed in future years to correct further deficiencies. The bridge still offers many years of service potential with
consistent maintenance and the costs could be spread out over future years using the Annual Bridge Inspection and Repair
Program funding. An estimate for the replacement of the bridge has also been prepared to provide information necessary to
plan for the future of the pedestrian crossing and funding needs.
FINANCIAL IMPACT
The girder repair and repainting of the S 119th St Pedestrian Bridge could be funded through the 2015/2016 Bridge
Inspection & Repair Program. Currently $86,000.00 of the 2015 funding is slated for the required match of the 3 Major
Maintenance Bridge Projects. Repair work on the S 119th St Pedestrian Bridge could be constructed in stages over several
years using several bridge program funding cycles. Estimated costs for rehabilitation, replacement, and removal are below:
S 119th St Pedestrian Bridge Full Replacement
S 119th St Pedestrian Bridge Rehabilitation
S 119th St Pedestrian Bridge Removal
RECOMMENDATION
For information only.
Attachments: Page 10, 2015 CIP
Proposed CIP Bridge Project Sheet
DEA Summary Report
Estimate
$1,388,971.00
282,728.00
107,374.00 (Not an option)
W: \PW Eng \PROJECTS\A- RW & RS Projects \Bridge Inspection Programs \Bridge Inspections 2015 (91510402) \119th Ped Bridge \Info Memo 119St Ped Bridge Update TC gi- sb.docx
15
CITY OF TUKWILA CAPITAL PROJECT SUMMARY
2015 to 2020
PROJECT: Annual Bridge Inspections and Repairs Project No. Varies
DESCRIPTION: Ongoing program of bi- annual inspections, repairs, painting and rehabilitation of the 22 City bridges.
Federally required program identifies safety or repair needs in the early stages to minimize hazards and
JUSTIFICATION: costs. The number of bridge inspections necessary each year can vary between 3 and 8 bridges.
Inspection frequencies vary from bridge to bridge and WSDOT provides some inspection services.
STATUS: Construction projects will be determined from inspection reports and noted deficiencies /problems.
MAINT. IMPACT: Reduces maintenance costs.
COMMENT:
Ongoing project, only one year actuals are shown in the first column. 42nd Ave S Truss Bridge had repairs
completed in 2014 along with matching funds for the I -5 /Klickitat Dr - Unstable Slope /Elevated Walkway.
FINANCIAL Through Estimated
(in $000's)
2013 2014 2015
2016
2017
2018
2019
2020
BEYOND TOTAL
EXPENSES
Design
65
40
40
40
40
45
45
45
45
405
Land (R /W)
0
Const. Mgmt.
30
30
30
30
40
40
40
40
280
Construction
27
200
200
200
200
250
250
250
250
1,827
TOTAL EXPENSES
92
270
270
270
270
335
335
335
335
2,512
FUND SOURCES
Awarded Grant
236
236
Proposed Grant
0
Mitigation Actual
0
Mitigation Expected
0
City Oper. Revenue
92
34
270
270
270
335
335
335
335
2,276
TOTAL SOURCES
92
270
270
270
270
335
335
335
335
2,512
2015 - 2020 Capital Improvement Program
10
16
CITY OF TUKWILA CAPITAL PROJECT SUMMARY
2016 to 2021
PROJECT: Major Maintenance on 3 Bridges 2015
91510406
ject Nos. 91510407
91510408
DESCRIPTION: Perform Seismic Retrofit, Deck and Joint Repair a r under the Local Agency Bridge
Program on the Frank Zepp Bridg . . - . Beacon Avenue South Bridge.
The three bridges were identified a . n " e .r federal funding under the Local Agency Bridge
JUSTIFICATION: Program administered by WSDOT. e p posed work will preserve the City owned infrastructure and
extend the service lives of the bridges.
STATUS: Federal grant funding was approved after a competitive process in December 2014.
MAINT. IMPACT: Maintenance needs will be reduced once these three major maintenance projects are completed.
I rte rnree urruyes were approveu iur yranw unuer Separate ieuerai aiu nurnuers [JUL will ue currruineu
into one for the design & construction contract. Grant funding requires a 10% match for the design phase;
projects that obtain construction authorization by 9/30/18 are eligible for 100% Federal funding for
rnnctn 'Minn
COMMENT:
FINANCIAL Through Estimated
(in $000's)
2014 2015 2016
2017
2018
2019
2020
2021
BEYOND TOTAL
EXPENSES
Design
866
866
Land (R/W)
0
Const. Mgmt.
593
593
Construction
3,889
3,889
TOTAL EXPENSES
0
866
4,482
0
0
0
0
0
0
5,348
FUND SOURCES
Proposed BRAC Grant
780
4,482
5,262
Mitigation Actual
0
Mitigation Expected
0
City Oper. Revenue
0
86
0
0
0
0
0
0
0
86
TOTAL SOURCES
0
866
4,482
0
0
0
0
0
0
5,348
2015 - 2020 Capital Improvement Program
10
17
CI
DAVID EVANS
AN °ASSOCIATES " "c
S. 119th Street Pedestrian Bridge (Tukwila 16)
Rehabilitation and Replacement Alternative Analysis
Introduction
The existing pedestrian bridge over the Duwamish River was constructed in 1965. It consists of
three spans with a 127' main span and two approach spans of 53' each (Figure 1). The bridge
serves the residential communities between 42nd Street and Interurban Avenue. The
superstructure is composed of two glued laminated (glulam) beams, which also serve as
pedestrian railing. The two intermediate piers in the river are founded on timber piles and
timber fenders. The timber plank decking spans between caps suspended from the glulam
beams.
Figure 1— S 119th Pedestrian Bridge
The bridge was last inspected in in 2013. However, the intermediate piers were not inspected
and no condition assessment for scour was made. There is some evidence of repair to the top
of the fender dolphins. A steel I beam has been added to the timber caps at each intermediate
pier to remedy cap crushing and prevent racking of the bridge.
Bridge Condition Assessment
The foregoing is based on visual observations of the engineer preparing this report as well as a
condition assessment report performed by King County 2013. The bridge was assessed to be in
fair condition by the inspector who prepared the condition assessment in 2013.
Glulam Girders
The glulam beams were last painted in 2002. The existing coating has completely failed
and the beams are starting to weather severely (Figure 2). Approximately one third of
Tukwila -16: S. 119th Street Pedestrian Bridge Page 1 of 4 David Evans and Associates, Inc.
Rehabilitation and Replacement Alternative Analysis May 23rd, 2015
18
CO al
DAVID EVANS
...ASSOCIATES iwc
the length of top glulam beams have severe rotting, with the top laminate completely
disintegrated. The laminate under a number of hanger washer plates are rotted.
Figure 2 _ Glulam girder with rotted top laminate
The coating from the 2002 has failed completely and there is evidence of checking and
start of glulam decay.
Timber Decking
The timber planks were assessed to be in fair shape in the 2013 condition assessment
report. There are a few ridges which need to be planed to prevent tripping. The surface
also seemed slippery, particularly at one location where it was replaced with smooth
plywood (Figure 3).
Figure 3 — Timber plank decking
19
CD CI
DAVID EVANS
^N °ASSQClAT,S "'`
Timber Substructure
The timber substructure was not assessed during the condition assessment in 2013 nor
was any underwater inspection performed to assess scour. However, they seem to be
in fair shape based on visual observation (Figure 4).
Figure 4 — Pier 3 timber foundation and fenders
Miscellaneous Structural Elements
The galvanizing and paint coating on the hanger washer and bolts has failed and
corrosion has initiated. Any repair would need to address preservation of the steel
hardware.
Other timber elements including caps, blockings and braces are showing signs of
weathering and were generally found to be in fair condition in the 2013 assessment. The
toe boards attached to the glulam blockings are preventing free drainage off the deck.
Alternative Analysis
1. Rehabilitation
A set of drawings have been prepared to address the immediate repairs needed to
preserve the existing fair condition of the bridge. The suggested bridge rehabilitation
includes:
• replacement of the glulam top laminates where required;
• packing two part epoxy under the hanger washers as needed;
• surface prep and coating of the glulam beams, blockings, caps, and bracings;
• replacement of the toe boards;
• sweep blasting of all steel hardware before coating; and
r, t
16: S. 1.19''' Street . Pedestrian Bridge 'z „r 3
of 4 Evans and
Associates, liar:.
Rehabilitation and Replacement Altc,rnativ• Analysis May 23 2015
20
Q
DAVID EVANS
4Nn ASSOCIATES'.^
• sweep blasting of the timber deck planks, planing and sealing with linseed oil
based coating.
The total estimated repair cost is $283,000.
2. Replacement
The existing bridge can be replaced with a new pedestrian bridge approximately 190'
long spanning the entire river with no piers in the waterway. Approach structural earth
walls approximately 22' each will also be required. This option will allow for a
significantly easier environmental permit process.
The most economically feasible structure types for replacement are precast, pre-
stressed deck bulb T girders, a prefabricated truss, and a Baily -type structure. The cost
estimate prepared is for the pre- stressed beam structure. Other aesthetically pleasing
structure types, at higher costs, are precast concrete arch and single tower stay -cable
structures.
The substructure is expected to be founded to deep foundations, either drilled shafts or
open ended steel piles. We have priced open -ended piling in this estimate.
The cost estimate for replacement is approximately $1,380,000.
This bridge has not been assessed for determination of historical significance.
Life Cycle Cost Analysis
This life cycle cost analysis is based on the following assumptions:
• an inflation rate of 2.04 %;
• an existing bridge life expectancy after repairs of 10 years, up to year 2025 (assuming
pile foundations are in fair shape and no scour);
• a new bridge service life of 75 years; and
• a new bridge salvage value of 60 %/75% of 2015 value.
Our analysis indicates a Net Present Cost of $363,000 for the repair option and $282,000 for the
replacement alternate.
0 u iiia- i (1 S 119` St ems. Pedestrian Bridge Page 4 "Y ..!
.Evans and Associates: _._
Reo acement Al .ernativ e Analysis May 23-1'. 2015
21
City of Tukwila
S. 119th Street Pedestrian Bridge
The cost estimate was based on the following assumptions:
• Mobilization 10 %;
• Washington State Sales tax of 9.5 %;
• Presence of No Hazardous Materials;
• Existing Water Line Relocation Would not be Required for the Replacement Option;
• County Staff Would Perform the Rehabilitation Work;
Alternative
Estimated Cost ($)
Rehabilitation
$ 282,728
Replacement
$ 1,388,971
Removal
$ 107,374
22
City of Tukwila S. 119th Street Pedestrian (TUK -16) Bridge Painting Cost Estimate
2
o 4-
m v,
� Oo
O
00
01
M
N
VF
O
00
l0
iA
to
.-1
n
N
00
In
M
O
0
O
Ill
i/F
0
0
M
0
O
N
ey
iA
0
0
0
ei
0
0
0
,-■
0
0
0
e-1
Vf
0
0
0
ei
0
0
0
'-I
0
0
In
j/1
t0
LA
N
t0
ei
01
M
ei
ei
M
00
l0
N
N
Ill
00
N
O
ei
O
<n
O
N
VI-
00
0)
ei
N
N
0
N
O
'-I
to
00
O
O
O
Lf1
O
-1
0
0
N
O
O
O
0
O
0
-1
O
O
0
O
0
O
O
Ili
00
01
e-I
a-1
LL
N
LL
J
LL
N
LL
J
LL
V1
J
VI
J
REMOVING and REPLACE PORTION OF EXISTING GLULAM BEAMS
REMOVING AND REPLACE TOE BOARDS
CLEANING AND PAINTING BRIDGE
CONTAINMENT OF ABRASIVES
0
z
-J
0
U
z
0
z
J
C7
U
z
J
W
❑
z
z
co
U
w
❑
❑
cn
TYPE B PROGRESS SCHEDULE
ROADSIDE CLEANUP
NO TRASSPASSING SIGN
HEALTH AND SAFETY PLAN
SPCC PLAN
SUBTOTAL
u1
)-
U
Z
w
z
w
F-
z
0
U
I'r1
O
z
w
w
z
z
w
F-
co
0
0
z
0
H
U
cc
F-
(4)
Z
0
0
u-)
F-
z
w
w
O
z
z
0
F-
U
1-
z
0
U
0
z
O
O
2
0
0
(D
00
00
00
t0
O
ao
t7
h-
op
nr
O
CD
0
O
0
0)
(D
00
0
L0
C0
ch
r
ASSUMPTIONS:
COUNTY FORCES TO PERFORM THE WORK
23
City of Tukwila S. 119th Street Pedestrian Bridge (TUK -16)
Replacement Cost Estimate
BRIDGE
$ 678,462
TEMPORARY CONSTRUCTION EASEMENT
$ 15,000
MOBILIZATION (10 %)
$ 67,846
CONTENGENCY (35 %)
$ 271,385
SUBTOTAL
$ 1,032,692
ENGINEERING (15 %)
$ 154,904
CONSTRUCTION MANAGEMENT (10% CONSTRUCTION COST)
$ 103,269
TAX (9.5 %)
$ 98,106
Assumptions:
No Haz -mat
24
City of Tukwila S. 119th Street Pedestrian Bridge (TUK -16)
Removal Cost
Item Description
Cost ($)
Exist. Bridge Removal
63,180
Mobilization (10 %)
6,318
Subtotal
69,498
Contingency (25 %)
17,375
Engineering (10 %)
6,950
Construction Management (10 %)
6,950
Tax (9.5 %)
6,602
Assumptions
Cost of existing water line relocation is not included
25
26
Total 1
00
d-
rn
d-
�Blockings
o
LD
Toe Board
2341
Kickers
rn
m
Caps
3201
Lli
tri
r
468
C c
co
L!l
Ql
O
c
=.
V)
J
V)
Component
Glulam Repair Area
Toe Boards
Paint Surface Ares
E
i--I
N
m
26
RI
Bridge Replacement Alternative Cost
O
u
L()
m
0
O
i
O
O
O
L(1
N
O
0
0
0
N
N
0
O
u
Y_
1
J
to
c
O)
J
0
0
'7
CO
Y
L
l)0
0J
O
Q1
In
H
(0
N
0
In
N
O
1
4!
Y
E
(0
r.
N
E
w
4-
H
(0
4:
(0
0
00
.;
0
(0
W
O
0
w
0I
(0
O'
0
0)
CO
CO
0
u
0
0
0
N
u0
0
0
0
0
O
N'
O
O
L.1-1
LA
0
u
z
ul
M
li
01
d
O
O1
00
0
Cost Based on Elements
0
O
O
u1
O
u
N
to
M
1!1
rl
O
M
(0
011
N
0
S
N
L11
�-1
0
O
O
O
to
00
rl
0
0
0
N
N
O
CO
ri
M
tD
r-1
c
0
0
O
0
0
.-1
O
O
N
0
0
0
0
0
0
r(
tl1
ttl
m
-4
D
W
J
Y
0
LL
J
1—
L/)
w
0
L/)
T
U
c
LL-
J
L/)
LL
1.41
w
C
0
0
0
0
m
O
00
m
a--I
N
N
LD
0
00
v
O
O
(.0
r-1
N
c
E
0)
W'
too
c
2
o�S
00
ra
0)
U
01
0
0)
4)
v)
0)
W
41
a
0
a
u
41
0
L
7
J
c
0
co
X
w
c
C
0
L
0
ro
0
2
2
c
0)
co
0)
u
0
c
00
CG
c
4)
m
0
m
X
LU
ISO
0
CDE
0)
Y
1
c
0
u
U
2 V
E
c O 0)
U w a
C
110
v
L L }Li
7 U In
O 7 -o
c J
3 0 c
o c w
• (a
j t N
vi L °n. 0
Ln
0 (0
0 (0 0) c C O
▪ E r f0 0
0. J L-.
E • 2 ' X
In (0 1O
Q Z >i C7 u..
27
City of Tukwila S. 119th Street Pedestrian Bridge (TUK -16)
Life Cycle Cost Analysis
Alternative
Expenditure Description
Year
Construction Cost
Present Value
- ®'I
Design and Permitting
2
$ 24,683
Painting
2
$ 258,045
Deck Replacement
5
$ 30,000
Pier Fenders /Caps
5
$ 50,000
Salvage Value
15
$ -
.. _
4 o
Replacement
Design and Permitting
2
$ 154,904
Construction Cost
6
$ 1,234,067
HMA Deck Overlay
25
$ 2,000
HMA Deck Overlay
50
$ 2,000
Salvage Value
$ (1,111,177)
Assumptions:
Real Discount Rate (d)
Nominal Discount Rate (D)
Inflation Rate (1)
Analysis Period
i= [(1 +D) /(1 +d)] - 1
FV = C *(1 +i)An
PV = FV /(1 +D)An
2.80%
4.90%
2.04%
75 Yrs
28
1 noimIR
GENERAL NOTES:
S 0_ H 0 0
'- W ~ OZw 1 w Z N
V'1 Q p Z pH !nO O 0 Ill
W O H J U Q w Z Y Q Ir W
UwE2 Z CL I- Zpw w W¢ Wix 0_ m CT CC 00_ aOmp two aaW~ SO =ww U(n CD J m
D_ Z0z JZ1 0- (0j0_'- 0� 0 wUO ¢ O
O~ 0_ Q m Q W Y co 0 N �' 0 Uj m ▪ - 0
Z U~ Z_ 07 V=7 L_ •
Q 0_ J U p D U o - O_ Q S Z} N d
Q O_ p w O Q Z N Z ° Z~ ~_ Q w
Z a O Z 1'00 = S <,,,-,n Q U 5. H p Q 0
_ww< Q_,Z-S0 U S UQ ~ m Z J }OS 00 0
moo 00 omI� owa aoa °v'Ur - cn LI
J¢ ▪ I- N (n J N O w Z (n OD 0_ J X M Q a J> CO 0 0 LI
0 00 W 0 X
Q 0 Q D < 0_ J_, 0 (iNj 1 J J In Q W w /- J w
W w O J
• ZlU-i H wN vi" d z �' W J 00 Q¢tY _JZ> Q 0 H CC 05< 0_ Z } W Z w J 1 0_ O O O
1- , 0 0¢ w Q 0] O m Q F" S F w 3
0_ UH NF- O Z O V1� Z z
Z N Z H w L . a J W J = Q ° W 0 w W 0 J
▪ O Q < 0 Q CO J U J U W Lil in Q K J
Q Q 0 0 O °W W w J (n ZO H 0_ U Z IQi H Z p d 0 0 0
10ZF 0¢Q a 0¢w¢ w>0 Jam¢ Pwa 0. 7)i z
0 Q In J w 0_ 0_ O m U N 6 ° d Q= J N Z W
° H N O O J w O U w O= a Q= 2 J O W¢ a 0 0
Q z z U z (n m ° Q U' J w F- d d' Z w Q J
J� �°- Q N a J U° 0 a- H J= F 0 0 Q 0 z w O Z¢ Z
QwQO_ Xw< < z5cn v1 =3 z o H ~z a W O
E ct H V w =
11<101 O H W 0: H- 0U-1< Q = H Q
w° CC Z N�
0101000 1§-, _° d. S 1E 1- 0 10
< w cL 0 3 K Ln W FS- W w w N J j U O 10 0 S Q M J tY Q
cc l/1 0 i- W 0 0 > 0 CC =_ > W a H¢ w Z= Q H U O Q N
_111.1<0 w 212 002 ~~ 0 Q Q 0 Q w 1 J d d ).- 1 Z U
J=D! Z =<0_J w Z I- W Li 10 0 0 = Z 0_-.Z,._7<0.. 0 0 0 0
< ---< I-500_ 1<000 102 QUO Q Z> Z Q lL Li 00
WORKMANSHIP
N M U 10 r N
N
O
0
0>
n n
EXISTING BOLTS
v
v
0
z
0
J
° N
J 0
0 I-
0 N
Z
N
Q
X W
W L7]
DID
125' CLEAR SPAN
DUWAMISH RIVER
w In W
1 0_ O
O▪ 0«I
0 1 - 3 W
0H ~za
0 m = H
10 0_ 0
o 0 w 0 0
O -0z0
W W W
10 J >0
z Z J Q O=
Qom¢ >o
0WQ
OZ J�CC
Q (n w0 Q
U w n W Z=
▪ J 6
H
D O O m Q 3
QH �' 00
Q 0 W w
O 0 Q X W
0]
10 w1 Zw
10101-0_ _
cc in w��
0
:<
J
007
N
T
w
0 H � 0
Z Q 0 Y
W Z U
';CZ X o W J O Q
U WD
w
wQLY- >
WOOD -0 Oam((ni1ZUm^
WWOIYX OJ QI
X 0_1-0_ N 10 -
-H
0
J W
0 CO
W
0
2
Scale AS SHOWN
Date MARCH 2015
0
2
W
U`
z Z
< 2LL
cc I-
v. f
Lu
0 g m
W Q
d
W
W 0 CC
w H W
(
2
- m
0)
Q
Z
zo
w /
U'
ow
ME of
Z
NN
zw
<I-
><
wV
00
9N
0<
Z
a
wpm
MN-
f,
0
0
0
a
0
6'
U
0
a`
*ENGINEERING *STREETS* WATER *SEWER *PARKS *BUILDING *
DAV' L LOOH)If i- L03d-93\S133HS \OV00090 \L L 00000010 f11U\d - weLSA L S L/L 1 /f0 oIp
29
1 1iii1iMNP111 CIO Aida
0 _J
O O
EC °
Z )
J a
C
-°
U
Z w id
cn
J
x °
o3 z
W 3
U U W V O W
Qa�wp I- V)
< °
x d O CO w
C W Z W CC
w r 10-
J Z
CD a
O
0
Scale AS SHOWN
Date MARCH2o15
ce
W
0
0
E2
z Z
Q 0
cc Q
m co
Wr'J
d
Q
> 2
W
W
WI-W
H 0
S
m
O)
co g
0
Wu,
• w
O 0
co
z
z
NN
ZW
><
WO
00
>0)
0<
0
z
0
)) N
tO CO O
•
Zrno
c
> 0) co
0 __co M
c00 '- 0)
m A CO
EL
0,0
0 0
U a
0
It
[%;
( 4
*ENGINEERING *STREETS *WATER *SEWER *PARKS *BUILDING *
BMP L L00H Nfi1- Z03d-B3 \S133HS \OV000b0\ 11000000H)Vil \vd - we 10 :0 t S t /EZ /E0 .IP
30