![Page 1: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/1.jpg)
Load Rating of a Steel Composite
Girder Bridge
Luis J. Vila, Ph.D.
Structural Engineer, GM2 Associates, Inc.
MIDAS 2016 Elite Engineers Webinar Series
April 07, 2016
![Page 2: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/2.jpg)
2
Presentation Outline
Introduction
Modeling Aspects
Construction Stage Analysis
Live Load Analysis
Load Rating
Analysis of Expansion Joint
![Page 3: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/3.jpg)
3
Introduction
Bridge location
![Page 4: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/4.jpg)
4
Introduction (Cont’d)
Bridge location
![Page 5: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/5.jpg)
5
Introduction (Cont’d)
Bridge 00032, Stamford, CT
MNRR
I 95
![Page 6: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/6.jpg)
6
Introduction (Cont’d)
Built in 1958
Rehabilitation work since: joints replacement, substructure
strengthening, widening
![Page 7: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/7.jpg)
7
Introduction (Cont’d)
Bridge 00032 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
![Page 8: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/8.jpg)
8
Introduction (Cont’d)
Span 7: I95 over Metro-North Railroad (MNRR)
Steel Through Girders
Composite and Non-composite Floorbeams
NB Traffic
SB Traffic
Diagonal Expansion Joint
11 ft
200 ft Span
![Page 9: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/9.jpg)
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
![Page 10: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/10.jpg)
10
Steel Composite Girder Modeling
Material:
• - SRC
Section:
• -Composite
• -Ds/Dc=0
Weight of concrete
applied as distributed
load
Definition of Steel Composite
Girder Geometric and Material
Properties
![Page 11: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/11.jpg)
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
![Page 12: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/12.jpg)
12
Steel Through Girder Modeling
![Page 13: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/13.jpg)
13
Concrete Deck Modeling
Deck Dummy Elements
• -Weightless concrete
• -Provide transverse connection
between floorbeams
• -Transverse distribution of live
loads and composite dead loads
![Page 14: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/14.jpg)
14
Diagonal Expansion Joint Modeling
Diagonal Expansion Joint
Compression only link
Rigid elastic link
![Page 15: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/15.jpg)
15
Construction Stage Analysis
Composite stage
Non-composite stage
Composite Section for Construction
Stage
Stage 1: Steel Only
![Page 16: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/16.jpg)
16
Construction Stage Analysis (Cont’d)
Stage 3: Composite Action
Stage 2: Concrete Pour
![Page 17: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/17.jpg)
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
![Page 18: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/18.jpg)
18
Live Load Analysis (Cont’d)
Traffic Lanes
• -Forward and backward moving load
![Page 19: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/19.jpg)
19
Live Load Analysis (Cont’d)
Live Load Analysis Results
• -Moment Diagrams
Non-Composite Floorbeam
![Page 20: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/20.jpg)
20
Live Load Analysis (Cont’d)
Live Load Analysis Results
• -Displacement Results for HL93 Truck
![Page 21: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/21.jpg)
21
Load Rating
Strength Limit State: Service Limit State: Fatigue Limit State:
![Page 22: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/22.jpg)
22
Load Rating (Cont’d)
Fatigue Limit State
![Page 23: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/23.jpg)
23
Load Rating (Cont’d)
Parameters for Fatigue Rating
![Page 24: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/24.jpg)
24
Load Rating (Cont’d)
Fatigue Limit State
• -Rating Results
If RF < 1.0 => Check for finite fatigue life
![Page 25: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/25.jpg)
25
Analysis of Expansion Joint
Analysis of Expansion Joint Under Live Load
NB Traffic
SB Traffic
Corrosion of floorbeam below expansion joint due to active water
leakage
Damaged deck due to repeated impacts against top flange of floorbeam
![Page 26: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/26.jpg)
26
Analysis of Expansion Joint (Cont’d)
Span 7 over MNRR
Planking for floorbeam
inspection
![Page 27: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/27.jpg)
27
Analysis of Expansion Joint (Cont’d)
South Side of Non-Composite floorbeam North Side of Non-Composite floorbeam
![Page 28: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/28.jpg)
28
Analysis of Expansion Joint (Cont’d)
Deck deterioration along joint
![Page 29: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/29.jpg)
29
Analysis of Expansion Joint (Cont’d)
![Page 30: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/30.jpg)
30
Analysis of Expansion Joint (Cont’d)
![Page 31: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/31.jpg)
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
![Page 32: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/32.jpg)
32
Analysis of Expansion Joint (Cont’d)
Moving Load Tracer
![Page 33: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/33.jpg)
33
Analysis of Expansion Joint (Cont’d)
Moving Tracer Results
Maximum (upward) displacement at midspan
Minimum (downward) displacement at midspan
![Page 34: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/34.jpg)
34
Analysis of Expansion Joint (Cont’d)
Case 1: Maximum (upward) displacement of deck at expansion joint
Through
Girder
(South)
Pier 6 Pier 7
Deck
Joint 16 kips wheel load4 kips wheel load
N
Through Girder
(North)
![Page 35: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/35.jpg)
35
Analysis of Expansion Joint (Cont’d)
Deck
Joint
Through
Girder (South)
Through
Girder
(North)
gap
Case 1: Maximum (upward) displacement of deck at expansion joint
![Page 36: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/36.jpg)
36
Analysis of Expansion Joint (Cont’d)
gap
gap
Case 1: Maximum (upward) displacement of deck at expansion joint
![Page 37: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/37.jpg)
37
Analysis of Expansion Joint (Cont’d)
Through
Girder (South)
Through Girder
(North)Pier 6 Pier 7
Deck
Joint16 kips wheel load
N
4 kips wheel load
Case 2: Minimum (downward) displacement of deck at expansion joint
![Page 38: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/38.jpg)
38
Analysis of Expansion Joint (Cont’d)
Deck Joint
Through
Girder (South)
Through Girder
(North)
gap
gap
![Page 39: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/39.jpg)
39
Conclusion
midas Civil advantages
• -User friendly
• -Graphic user interface
• -Fast and accurate bridge modeling
• - General section designer
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)
![Page 40: Load Rating of a Steel Composite Girder Bridgenorthamerica.midasuser.com/web/upload/sample/EEW05_LVila...Load Rating of a Steel Composite Girder Bridge Luis J. Vila, Ph.D. Structural](https://reader035.vdocuments.us/reader035/viewer/2022081621/612e054b1ecc515869428d14/html5/thumbnails/40.jpg)
40
Questions?