Inventory Inspection and Load Rating of a Complex Segmental Concrete Bridge. Presented by Matthew J. Lengyel, PE, SE
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1 Inventory Inspection and Load Rating of a Complex Segmental Concrete Bridge Presented by Matthew J. Lengyel, PE, SE
2 Introduction
3 Project Overview Parallel Segmental Bridges (1F 763 and 3F 763) Number of Spans per Bridge = 3 Total Bridge Length = 1,022 feet (Each) Main Span Lengths = 438 feet
4 Project Overview 2 lanes of Traffic per Bridge Bridge Widths = Depth at Pier = 19-2½ Depth at Mid-span = 9-2½
5 Inventory Inspection - Overview Construction and As- Built Data Gathering Planning the Inspection Performing the Inspection Final Condition Rating
6 Inventory Load Rating - Overview Load Rating Philosophy Longitudinal Load Rating Analysis Transverse Load Rating Analysis Final Load Rating
7 Inventory Inspection Construction Data Designer: FIGG Engineering Group Contractor: Wadsworth Brothers Construction Construction Engineer: Summit Engineering Group, Inc.
8 Inventory Inspection Construction Data Construction and Maintenance Documents Design Drawings Erection Manual Concrete Reports Post-Tensioning Reports As-Built Drawings Maintenance Manual
9 Inventory Inspection - Planning Review of Construction and As-Built Data Review of Owner s Reporting Requirements NBI Ratings Familiarization with Unique Elements
10 Inventory Inspection - Planning Inspection Requirements and Support and Equipment Confined Space Entry UBIT Traffic Control
11 Inventory Inspection Substructure Abutments Stem Walls Backwalls Wingwalls
12 Inventory Inspection Substructure Main Piers Hollow Main Piers Pier Extensions
13 Inventory Inspection Bearings Abutment Bearings Guided Bearings Non-Guided Bearings Bearing Measurements
14 Inventory Inspection - Bearings Pier Bearings Fixed Bearings (At Pier 3) Guided and Non-Guided (At Pier 2)
15 Inventory Inspection - Superstructure Exterior Bottom Slab Variable Thickness Internal Post-Tensioning
16 Inventory Inspection - Superstructure Exterior Webs and Overhangs Variable Depth Transverse Post-Tensioning Blockouts
17 Inventory Inspection - Superstructure Interior Box Surfaces Interior Bottom Slab Interior Webs Interior Deck Slab
18 Inventory Inspection Post-Tensioning External Tendons End Diaphragms Deviators Pier Diaphragms
19 Inventory Inspection Post-Tensioning External Tendons Anchorages Tendon Ducts
20 Inventory Inspection Post-Tensioning Internal Tendons Transverse Tendons Cantilever Tendons Bottom Slab Tendons
21 Inventory Inspection - Joints Abutment 1 Joints Movement Capability Inches (Contraction) 3.80 Inches (Expansion)
22 Inventory Inspection - Joints Abutment 4 Joints Movement Capability 6.14 Inches (Contraction) 1.50 Inches (Expansion)
23 Inventory Inspection - Deck Top Deck Riding Surface Post-Tensioned in Both Directions Construction Pourbacks
24 Inventory Inspection - Barriers Bridge Barriers Concrete Single Slope Barriers
25 Inventory Inspection Other Elements Vermin Guards Bridge Drains Crash Attenuators
26 Inventory Inspection Final Ratings Condition Ratings (Both 1F 763 and 3F 763) Deck: 8 Superstructure: 8 Substructure: 8
27 Load Rating - Philosophy Develop a Load Rating System for a Complex Segmental Concrete Bridge that the Owner Could Use Again in the Future.
28 Load Rating Philosophy Longitudinal Analysis RM Bridge CSI Bridge Transverse Analysis RM Bridge Homberg Chart Analysis
29 Load Rating Ratings Requirements Inventory Rating Normal Live Load Vehicles Occurring Daily Operating Rating Rare Overload Vehicles Live Loads Rated HL-93 (AASTHO LRFD) Legal Loads (MBE) Permit Load (UDOT Overload OL)
30 Load Rating Rating Requirements Longitudinal and Transverse Flexure Tension Limit = 3*sqrt(f c) Compression Limit = 0.6*f c Longitudinal Principle Tension (MBE, Sec. 6A ) Principle Tension Limit = 3.5*sqrt(f c) Longitudinal Shear (MBE, Sec. 6A ) Per AASHTO Section 5.8.6
31 Load Rating Rating Requirements Time Dependent Effects and Change Conditions End of Construction (EOC) With 2½ Integral Wearing Surface (EOC, wiws) Without 2½ Integral Wearing Surface (EOC, woiws) Day 10,000 (D10K) With 2½ Integral Wearing Surface (D10K, wiws) Without 2½ Integral Wearing Surface (D10K, woiws)
32 Load Rating Rating Requirements Other Factors Post-Tensioning Stresses Thermal Gradient (0.5 for Inventory Ratings) Secondary Post-Tensioning Forces System Factor (MBE, Table 6A ) 1.0 for Transverse Load Ratings 1.1 for Longitudinal Load Ratings
33 Load Rating Longitudinal Analysis RM Bridge Model Entire Bridge Modeled (One Structure) 3D Frame (Spine Model) Models with and without IWS Variable Depth Cross Section
34 Load Rating Longitudinal Analysis RM Bridge Model Post-Tensioning Tendons Modified Construction Sequence with Time-Dependent Effects (EOC and D10K)
35 Load Rating Longitudinal Analysis CSI Bridge Entire Bridge Modeled (One Structure) 3D Frame (Spine Model) Same Node Locations as RM Bridge Model
36 Load Rating Longitudinal Analysis CSI Bridge Used for Longitudinal Live Load Analyses
37 Load Rating Longitudinal Analysis Microsoft Excel Contains Results from RM Bridge End of Construction Day 10,000 Both with and without IWS
38 Load Rating Longitudinal Analysis Microsoft Excel Export Results from CSI Bridge Calculates Rating Factors Calculates Controlling Rating Factors for Longitudinal Analysis
39 Load Rating Transverse Analysis RM Bridge Model Cross Section at Pier Modeled Cross Section at Midspan Modeled 2D Frame Models
40 Load Rating Transverse Analysis RM Bridge Model Post-Tensioning Tendons Time-Dependent Effects (EOC and D10K) Models with and without IWS
41 Load Rating Transverse Analysis Homberg Charts Cantilever Charts Span Charts Haunch Charts
42 Load Rating Transverse Analysis Homberg Charts Calculate Units Applies Wheel Locations Determine Live Load Coefficients
43 Load Rating Transverse Analysis Microsoft Excel Contains Results from RM Bridge End of Construction Day 10,000 Both with and without IWS
44 Load Rating Transverse Analysis Microsoft Excel Input Live Load Coefficients Calculates Rating Factors Calculate Controlling Ratings for Transverse Analysis Updates Bridge Rating Factor Worksheet
45 Load Rating Final Load Rating Design Load Rating Operating RF = 1.84 Longitudinal Principle Tension at D10k, wiws Inventory RF = 1.30 Longitudinal Shear at D10k, wiws
46 Load Rating Final Load Rating Legal Load Rating Legal RF = 1.75 Transverse Flexure at D10k, woiws Permit Load Rating Permit RF = 3.27 Longitudinal Principle Tension at D10K, wiws
47 Conclusion Inventory Inspection Load Rating
48 Inventory Inspection and Load Rating of a Complex Segmental Concrete Bridge QUESTIONS? Presented by Matthew J. Lengyel, PE, SE
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