Load Rating of a Steel Composite Girder Bridge
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1 Load Rating of a Steel Composite Girder Bridge MIDAS 2016 Elite Engineers Webinar Series April 07, 2016 Luis J. Vila, Ph.D. Structural Engineer, GM2 Associates, Inc.
2 Presentation Outline Introduction Modeling Aspects Construction Stage Analysis Live Load Analysis Load Rating Analysis of Expansion Joint 2
3 Introduction Bridge location 3
4 Introduction (Cont d) Bridge location 4
5 Introduction (Cont d) Bridge 00032, Stamford, CT I 95 MNRR 5
6 Introduction (Cont d) Built in 1958 Rehabilitation work since: joints replacement, substructure strengthening, widening 6
7 Introduction (Cont d) Bridge overview: 17 spans carrying I95 over MNRR and local roads 1065 ft long 16 Steel Composite Girder Spans Main span over MNRR - Composite and Non-composite Floorbeams - Steel Through Girders 7
8 Introduction (Cont d) Span 7: I95 over Metro-North Railroad (MNRR) 200 ft Span Steel Through Girders Composite and Non-composite Floorbeams 11 ft Diagonal Expansion Joint SB Traffic NB Traffic 8
9 Defining Bridge Geometry Import geometry from Microstation or AutoCAD Bridge Wizard (e.g. Steel composite, PSC, Cable Stayed, Suspension) Define each node and element 9
10 Steel Composite Girder Modeling Definition of Steel Composite Girder Geometric and Material Properties Material: - SRC Section: -Composite -Ds/Dc=0 Weight of concrete applied as distributed load 10
11 Steel Through Girder Modeling Built-up Section - 2 Web Plates - 6 Plates for Flanges - Longitudinal Stiffeners Modeled using Midas Civil General Section Designer Tool -Import shape from Microstation or AutoCAD - Determines Section Properties of Built-up Section 11
12 Steel Through Girder Modeling 12
13 Concrete Deck Modeling Deck Dummy Elements -Weightless concrete -Provide transverse connection between floorbeams -Transverse distribution of live loads and composite dead loads 13
14 Diagonal Expansion Joint Modeling Diagonal Expansion Joint Compression only link Rigid elastic link 14
15 Construction Stage Analysis Composite Section for Construction Stage Non-composite stage Stage 1: Steel Only Composite stage 15
16 Construction Stage Analysis (Cont d) Stage 2: Concrete Pour Stage 3: Composite Action 16
17 Live Load Analysis Live Load Analysis for Load Rating: -Design (HL93) -CT Permit -CT Legal Traffic Lane Definition -Traffic Lane Optimization Center (Default) Left Right 17
18 Live Load Analysis (Cont d) Traffic Lanes -Forward and backward moving load 18
19 Live Load Analysis (Cont d) Live Load Analysis Results -Moment Diagrams Non-Composite Floorbeam 19
20 Live Load Analysis (Cont d) Live Load Analysis Results -Displacement Results for HL93 Truck 20
21 Load Rating Strength Limit State: Service Limit State: Fatigue Limit State: 21
22 Load Rating (Cont d) Fatigue Limit State 22
23 Load Rating (Cont d) Parameters for Fatigue Rating 23
24 Load Rating (Cont d) Fatigue Limit State -Rating Results If RF < 1.0 => Check for finite fatigue life 24
25 Analysis of Expansion Joint Analysis of Expansion Joint Under Live Load SB Traffic NB Traffic Corrosion of floorbeam below expansion joint due to active water leakage Damaged deck due to repeated impacts against top flange of floorbeam 25
26 Analysis of Expansion Joint (Cont d) Span 7 over MNRR Planking for floorbeam inspection 26
27 Analysis of Expansion Joint (Cont d) South Side of Non-Composite floorbeam North Side of Non-Composite floorbeam 27
28 Analysis of Expansion Joint (Cont d) Deck deterioration along joint 28
29 Analysis of Expansion Joint (Cont d) 29
30 Analysis of Expansion Joint (Cont d) 30
31 Analysis of Expansion Joint (Cont d) Determine the location of the truck when deck detaches from top flange -MIDAS Civil Moving Tracer Tool Location of truck causing maximum and minimum displacement of deck -Two locations of trucks causing a gap between deck and top flange 31
32 Analysis of Expansion Joint (Cont d) Moving Load Tracer 32
33 Analysis of Expansion Joint (Cont d) Moving Tracer Results Maximum (upward) displacement at midspan Minimum (downward) displacement at midspan 33
34 Analysis of Expansion Joint (Cont d) Case 1: Maximum (upward) displacement of deck at expansion joint N Through Girder Pier 6 (North) Pier 7 Deck Joint 16 kips wheel load 4 kips wheel load Through Girder (South) 34
35 Analysis of Expansion Joint (Cont d) Case 1: Maximum (upward) displacement of deck at expansion joint Through Girder (North) gap Deck Joint Through Girder (South) 35
36 Analysis of Expansion Joint (Cont d) Case 1: Maximum (upward) displacement of deck at expansion joint gap gap 36
37 Analysis of Expansion Joint (Cont d) Case 2: Minimum (downward) displacement of deck at expansion joint N Through Girder Pier 6 (North) Pier 7 Through Girder (South) Deck Joint 16 kips wheel load 4 kips wheel load 37
38 Analysis of Expansion Joint (Cont d) Through Girder (North) gap Deck Joint Through Girder (South) gap 38
39 Conclusion Load Rating Method -Composite girders/floorbeams (midas Civil) -Non-composite floorbeam (spreadsheet using results from midas Civil) -Through girders (spreadsheet using results from midas Civil) midas Civil advantages -User friendly -Graphic user interface -Fast and accurate bridge modeling - General section designer 39
40 Questions? 40
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