LOAD TESTING SUMMARY REPORT: LOOKOUT POINT SPILLWAY BRIDGE LOWELL, OR SUBMITTED TO: Tetra Tech INCA, Inc. 400 112 th Ave NE, Suite 400 Bellevue, WA 98003 www.incainc.com SUBMITTED BY: BRIDGE DIAGNOSTICS, INC. 1995 57 th Court North, Suite 100 Boulder, CO 80301-2810 303.494.3230 www.bridgetest.com July, 2013
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LOAD TESTING SUMMARY REPORT LOOKOUT POINT …LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 5 1. STRUCTURAL TESTING PROCEDURES The Lookout Point Spillway
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TABLE OF CONTENTS ...................................................................................................................................... IV
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 27
Figure 2.12 Stress History comparison between crawl speed and normal speed response
data.
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 28
3. CONCLUSIONS
Load tests indicated that the bridge was performing in a linear-elastic manner, and there were
no major signs of distress. The following conclusions were made during the preliminary data
review:
All of the response histories were reproducible and linear (with minimal thermal drift in
the strain responses) indicating that the data collected was of good quality.
Rotation sensor data and weldable foil gage data presented in the processed data Excel
file was filtered to reduce noise levels.
Responses indicated that there is a small level of axial end-restraint on the girders
provided by the bearing conditions. This end-restraint likely causes reductions in midspan
flexure by 10 to 20 percent based on analyses of similar structures.
Top and bottom gage pairs on the girders indicated the girders were acting compositely
with the deck.
Responses in the interior crane rail girder indicated it was participating in the live load
resistance. The exterior crane rail, which was bolted to the parapet experienced minimal
live-load response.
Significant lateral load distribution was observed during the load test. All 6 girders
provided significant contribution to the load response.
Principal stress calculations in girder webs near the diaphragm compared with girder
bottom flange responses indicated significant stress concentrations in the girder webs due
to the welded diaphragm connection to the web. Principal stresses in the web were as
much as 100% higher than those in the bottom flange.
The strain response histories showed minimal thermal drift in the sensors. Therefore, no
thermal correction was applied to the selected processed data.
As a whole, the load tests were very successful, and quality data was obtained. BDI would
like to thank Tetra Tech INCA, Inc. and USACE for organizing the project, and the Bridge
Access Specialties for providing the access/testing vehicles and field support.
The load test results presented in this report correspond to the superstructure at the time of
testing. Any further structural degradation, damage, and/or retrofits must be taken into account
in future ratings.
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 29
A. APPENDIX A – REFERENCE RESPONSE HISTORY PLOTS
The following plots include the response histories for each sensor from all three truck paths.
The location of each sensor is provided that defines its longitudinal, transverse, and cross
sectional position. A sensor location legend has been provided below where the location of each
gage is broken down into its longitudinal, transverse, and cross sectional location. In each plot,
response histories from all three truck paths are shown for the given sensor as a function of load
position. The load position represents the location of the test truck’s front axle relative to the test
reference point. For example, the load position labeled “0” corresponds to when the front axle of
the test truck is crossing the north expansion joint.
"X"-"Y"-"Z"
Where:
X = Longitudinal Gage Location - Defined by the Transverse gage line that the sensor is on
Y = Transverse Gage Location - Defined by the Longitudinal Gage Line the sensor is in line with
Z = Cross Sectional Location - Defined by the Position of the Sensor at its cross section
LONGITUDINAL GAGE LOCATION
(Distances from test reference point)
Section Distance, ft Description
A 4.42 Near North Pier Face
B 15.67 At North Diaphragm
C 23.67 At Midspan
D 31.67 At South Diaphragm
E 42.92 Near South Pier Face
TRANSVERSE GAGE LOCATION
(Distances from test reference point)
Gage line Distance, ft Description
1 22.25 Exterior Girder Line on East Side of Bridge
2 17.25 First Interior Girder on East Side of Bridge
3 12.25 Interior Girder to East of Center of Bridge
4 7.25 Interior Girder to West of Center of Bridge
5 2.25 First Interior Girder on West Side of Bridge
6 -2.75 Exterior Girder Line on West Side of Bridge
CR_I 17.50 Interior Crane Rail
CR_O 26.67 Exterior Crane Rail Girder
P -5.50 Parapet
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 30
CROSS SECTIONAL LOCATION
Location Description
B Bottom of Girder/Parapet/Crane Rail
BC Bottom of Girder Centered under the Diaphragm
BN Bottom of Girder 6" to the North of the Diaphragm
BS Bottom of Girder 6" to the South of the Diaphragm
T Top of Girder/Crane Rail
WE_D East Side of Web - Diagonally Oriented (45 degrees)
WE_H East Side of Web - Horizontally Oriented
WE_V East Side of Web - Vertically Oriented
WW_D West Side of Web - Diagonally Oriented (45 degrees)
WW_H West Side of Web - Horizontally Oriented
WW_V West Side of Web - Vertically Oriented
Figure A.1 Stress History Plot of gage at Sensor Location A-1-B – All Truck Paths.
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 31
Figure A.2 Stress History Plot of gage at Sensor Location A-2-B – All Truck Paths.
Figure A.3 Stress History Plot of gage at Sensor Location A-2-T – All Truck Paths.
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 32
Figure A.4 Stress History Plot of gage at Sensor Location A-3-B – All Truck Paths.
Figure A.5 Stress History Plot of gage at Sensor Location A-4-B – All Truck Paths.
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 33
Figure A.6 Stress History Plot of gage at Sensor Location A-4-T – All Truck Paths.
Figure A.7 Stress History Plot of gage at Sensor Location A-5-B – All Truck Paths.
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 34
Figure A.8 Stress History Plot of gage at Sensor Location A-6-B – All Truck Paths.
Figure A.9 Stress History Plot of gage at Sensor Location A-6-T – All Truck Paths.
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 35
Figure A.10 Stress History Plot of gage at Sensor Location B-2-B – All Truck Paths.
Figure A.11 Stress History Plot of gage at Sensor Location B-4-B – All Truck Paths.
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 36
Figure A.12 Stress History Plot of gage at Sensor Location C-1-B – All Truck Paths.
Figure A.13 Stress History Plot of gage at Sensor Location C-1-T – All Truck Paths.
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 37
Figure A.14 Stress History Plot of gage at Sensor Location C-2-B – All Truck Paths.
Figure A.15 Stress History Plot of gage at Sensor Location C-2-T – All Truck Paths.
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 38
Figure A.16 Stress History Plot of gage at Sensor Location C-3-B – All Truck Paths.
Figure A.17 Stress History Plot of gage at Sensor Location C-3-T – All Truck Paths.
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 39
Figure A.18 Stress History Plot of gage at Sensor Location C-4-B – All Truck Paths.
Figure A.19 Stress History Plot of gage at Sensor Location C-4-T – All Truck Paths.
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 40
Figure A.20 Stress History Plot of gage at Sensor Location C-5-B – All Truck Paths.
Figure A.21 Stress History Plot of gage at Sensor Location C-5-T – All Truck Paths.
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 41
Figure A.22 Stress History Plot of gage at Sensor Location C-6-B – All Truck Paths.
Figure A.23 Stress History Plot of gage at Sensor Location C-6-T – All Truck Paths.
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 42
Figure A.24 Stress History Plot of gage at Sensor Location C-CR_I-B – All Truck Paths.
Figure A.25 Stress History Plot of gage at Sensor Location C-CR_I-T– All Truck Paths.
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 43
Figure A.26 Stress History Plot of gage at Sensor Location C-CR_O-B – All Truck Paths.
Figure A.27 Stress History Plot of gage at Sensor Location C-CR_O-T – All Truck Paths.
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 44
Figure A.28 Stress History Plot of gage at Sensor Location C-P-B – All Truck Paths.
Figure A.29 Stress History Plot of gage at Sensor Location D-2-B – All Truck Paths.
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 45
Figure A.30 Stress History Plot of gage at Sensor Location D-4-BC – All Truck Paths.
Figure A.31 Stress History Plot of gage at Sensor Location D-4-BN – All Truck Paths.
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 46
Figure A.32 Stress History Plot of gage at Sensor Location D-4-BS – All Truck Paths.
Figure A.33 Stress History Plot of gage at Sensor Location D-5-BC – All Truck Paths.
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 47
Figure A.34 Stress History Plot of gage at Sensor Location D-5-BN – All Truck Paths.
Figure A.35 Stress History Plot of gage at Sensor Location D-5-BS – All Truck Paths.
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 48
Figure A.36 Stress History Plot of gage at Sensor Location E-1-B – All Truck Paths.
Figure A.37 Stress History Plot of gage at Sensor Location E-2-B – All Truck Paths.
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 49
Figure A.38 Stress History Plot of gage at Sensor Location E-2-T – All Truck Paths.
Figure A.39 Stress History Plot of gage at Sensor Location E-3-B – All Truck Paths.
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 50
Figure A.40 Stress History Plot of gage at Sensor Location E-4-B – All Truck Paths.
Figure A.41 Stress History Plot of gage at Sensor Location E-4-T – All Truck Paths.
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 51
Figure A.42 Stress History Plot of gage at Sensor Location E-5-B – All Truck Paths.
Figure A.43 Stress History Plot of gage at Sensor Location E-6-B – All Truck Paths.
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 52
Figure A.44 Stress History Plot of gage at Sensor Location E-6-T – All Truck Paths.
Figure A.45 Stress History Plot of gage at Sensor Location D-4-WED – All Truck Paths.
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 53
Figure A.46 Stress History Plot of gage at Sensor Location D-4-WEH – All Truck Paths.
Figure A.47 Stress History Plot of gage at Sensor Location D-4-WEV – All Truck Paths.
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 54
Figure A.48 Stress History Plot of gage at Sensor Location D-4-WWD – All Truck Paths.
Figure A.49 Stress History Plot of gage at Sensor Location D-4-WWH – All Truck Paths.
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 55
Figure A.50 Stress History Plot of gage at Sensor Location D-4-WWV – All Truck Paths.
Figure A.51 Stress History Plot of gage at Sensor Location D-5-WED – All Truck Paths.
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 56
Figure A.52 Stress History Plot of gage at Sensor Location D-5-WEH – All Truck Paths.
Figure A.53 Stress History Plot of gage at Sensor Location D-5-WEV – All Truck Paths.
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 57
Figure A.54 Stress History Plot of gage at Sensor Location D-5-WWH – All Truck Paths.
Figure A.55 Stress History Plot of gage at Sensor Location D-5-WWV – All Truck Paths.
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 58
Figure A.56 Rotation History Plot of gage at Sensor Location A-4-B– All Truck Paths.
Figure A.57 Rotation History Plot of gage at Sensor Location A-6-B – All Truck Paths.
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 59
Figure A.58 Rotation History Plot of gage at Sensor Location E-4-B – All Truck Paths.
Figure A.59 Rotation History Plot of gage at Sensor Location E-6-B– All Truck Paths.
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 60
B. APPENDIX B – EQUIPMENT SPECIFICATIONS
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 61
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 62
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 63
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 64
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 65
LOAD TEST AND SUMMARY REPORT – TO-20 LOOKOUT POINT SPILLWAY BRIDGE, LOWELL, OR 66
Figure B.1 BDI Autoclicker
3 Handheld Radios Motorola P1225 2-Channel (or equal) modified for both “Rx” and “Tx”. Power 9V battery
Mounting Universal front fender mounting system Target Retroreflective tape mounted on universal wheel clamp Bands/Power VHF/1 Watt or UHF/2 Watt Frequencies User-specified Data Acquisition System Requirements
TTL/CMOS input (pull-up resistor to 5V)
Output Isolated contact closure (200V 0.5A max switch current)