Structures Congress 2010
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1 Structural Modeling, Analysis and Instrumentation of the Maurice J. Tobin Memorial Bridge Structures Congress 2010 May 14, 2010 Brian Brenner
2 Introduction
3 Introduction
4 Tobin Bridge Description History & Location Constructed Opening Day Opened in 1950 History of bridge owners Mystic River Bridge Authority / Massachusetts Port Authority (Massport) Massachusetts Department of Transportation (MassDOT) 2010 present Courtesy of: LIFE magazine
5 Tobin Bridge Description Components
6
7 Objective System of Condition Assessment Computer models can predict the 3-D behavior Modeling error mitigation Instrumentation Non-destructive testing (NDT) Update/calibrate model Structural Health Monitoring (SHM) system Continuous more objective data Supplement manual subjective inspections
8 Project Team Massport RFP 2008 FE modeling Instrumentation Verification Consultant team selected Fay, Spofford & Thorndike Tufts University University of New Hampshire Geocomp Corporation
9 Computer Modeling Finite Element (FE) Modeling Detailed FE model of the Little Mystic Span Frame elements for all structural members Analysis tools glueware ; SAP API
10 Traditional Truss Assumptions Ideal boundary and continuity conditions Pinned joints Boundary condition Continuity condition: Courtesy of: [DelGrego et. al 2008]
11 FE Special Study Connection Stiffness FE model with fixed connections loaded and analyzed Midspan Loading Support Loading Axial Stress (ksi) Bending Stress (ksi) Total Stress (ksi) Axial Strain (με) Bending Strain (με) Total Strain (με) Member L5L U5U L0U L1M U1L L0L L1L L0U L0M L1M N1U
12 FE Special Study Boundary Conditions Model (A) - No Piers ; Model (B) - Piers Axial forces shown in red (above = tension ; below = compression)
13 Instrumentation of the Little Mystic Span System implemented to capture quasi-static and dynamic responses Instrument Type Number of Instruments Strain Gauge - Member 80 Strain Gauge Rosettes - 12 Connection Tiltmeters w/temperature 2 Sensor Accelerometers 6 Temperature Sensors 6 Weather Station 1
14 Instrumentation Data Collection Sensor data to isite High Speed (HS) Data Loggers Wirelessly - website Direct Connection to Laptop
15 NDT of the Little Mystic Span Load Test - November 10, 2009
16 Data Collection 1 Hz strain data collected for truss member strain gauges (1) Normal traffic (2) Baseline data collection (3) Crawl speed (4) Midspan stop (5) Crawl speed (6) Traffic resumes on Upper Level Change in Strain During Load Test for Bottom Chord L4L5 Gauge (7) Traffic on both levels
17 Manual Model Updating Objective Function A quadratic scalar objective error function is used Measure of model closeness to measured data
18 Manual Model Refinements Improve the fit to the data Refinements initial model included: Area elements Piers
19 Manual Model Refinements Stiffness Reduction Factors Analytical predictions > experimental data Hand holes for riveting operations Gross Axial Stiffness Effective Axial Stiffness Stiffness Reduction Factor (kip/in) (kip/in) (%) Bottom Chords Top Chords Diagonals
20 Manual Model Refinements Objective Function Summary Objective function for refinements
21 Parametric Studies Track with objective function Parameters of interest include: Boundary Conditions Continuity Conditions Non-ideal boundary/continuity conditions?
22 Parametric Studies Boundary Conditions
23 Parametric Studies Continuity Conditions
24 Model Verification Compare updated/calibrated model to other data Crawl speed test analytical v. experimental Analysis AMTS used for truck locations
25 Model Verification Bottom Chord Gauge L5L6
26 Model Verification Vertical Member Gauge L5U5
27 Model Verification Diagonal Member Gauge L6U5
28 Model Verification Diagonal Member Strain Pattern
29 Discussion Advancing Technology Electronic Signature of Bridge
30 Thanks to: Co-authors: Masoud Sanayei, Erin Bell and Eric Pheifer Geocomp inc: Allen Marr, Geoff Webster, Da Ha, Martin Hawkes
31 Structural Modeling, Analysis and Instrumentation of the Maurice J. Tobin Memorial Bridge
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