bridge load rating midas-civil
DESCRIPTION
load rating en midas civilTRANSCRIPT
Bridging Your Innovations to Realities
Load Rating Could be Critical
Bridging Your Innovations to Realities midas Civil
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Previous Webinar
midas Civil
2 2 2
Post Tensioned Box Girder Load Rating
Recap of 1st Webinar
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Conventional PT Box Girder Design Process
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Consequences of Using Multiple Platform : Longer time in Project Completion Different Model files for Different Software for Different Phases More Manpower In efficiency in Design, Higher Conservatism
Lesser Projects in More Time
Lesser Degree of Competency
Monetary Effects Repetition of
Work
Preliminary Design
Static, Moving Load Analysis
Seismic Analysis
Detailed Design
Constructability Check
Pier Design (PMM Curve), Foundation, SSI
Conventional PT Box Girder Design Process
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1 Software
What would be the benefits? Same Model File for different Analysis Perform Static, Moving and Dynamic Analysis at one platform Capture SSI for Design requirements Construction Stage Analysis Design Check/Constructability Check with AASHTO LRFD’12 Higher Degree of Precision, More optimized Design
Conventional PT Box Girder Design Process
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More Projects in Lesser Time
Higher Degree of Competency
Monetary Effects No Repetition
of Work
Conventional PT Box Girder Design Process
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Bridging Your Innovations to Realities midas Civil
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Overview
1. The bridge geometry is made.
• Materials and sections are defined.
• Nodes and elements are created.
• Boundary conditions are applied.
• Static loads are defined and assigned.
• Prestressed tendons are applied.
• Estimation of time dependent tendon losses as per AASHTO LRFD
2. Live Loads are applied as per AASHTO LRFD.
• Two lanes are defined.
• Two standard vehicles HL93 and One user defined Permit vehicle is defined.
3. Load rating Data:
• Longitudinal and shear reinforcements are applied.
• Load rating parameters and rating cases are defined.
• Rating design is performed.
4. Rating factors and results extraction
Post Tensioned Box Girder Load Rating
Bridging Your Innovations to Realities midas Civil
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Post Tensioned Box Girder Load Rating
Load Rating
Bridging Your Innovations to Realities midas Civil
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Post Tensioned Box Girder Load Rating
Modeling/Analysis of Bridge in Midas Civil
Define Permit Vehicle (user-defined & Library)
Define Parameters of Rating
Perform Automated Rating (AASHTO-LRFR 11) Check Rating Factors
Automated Load Rating in Midas Civil
Load Rating with midas Civil
Bridging Your Innovations to Realities midas Civil
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Introduction
Bridge Elevation
Bridge type: Two span, Post tensioned - 3 Cell Box girder bridge
184’ 128.5’
Bridge Cross-Section
Post Tensioned Box Girder Load Rating
Bridging Your Innovations to Realities midas Civil
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Load Rating: Strength
Dead-load effect due to structural components and attachments
Dead-load effect due to structural components and attachments
Bridging Your Innovations to Realities midas Civil
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Load Rating: Strength
Dead-load effect due to wearing surface and utilities
Dead-load effect due to wearing surface and utilities
Bridging Your Innovations to Realities midas Civil
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Load Rating: Strength
Temperature Loads Temperature Loads
Bridging Your Innovations to Realities midas Civil
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Load Rating: Strength
Secondary efffects of Tendon Prestressing Force
Secondary effects of Tendon Prestressing Force
Bridging Your Innovations to Realities midas Civil
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Load Rating: Strength
User Defined Loads User Defined Loads
Bridging Your Innovations to Realities midas Civil
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Load Rating: Strength
Adjacent Vehicle Load Adjacent Vehicle Load
Bridging Your Innovations to Realities midas Civil
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Post Tensioned Box Girder Load Rating
DC & DW have max/min, Temperature has (+,-) and Primary & Adjacent Vehicles have 12 types of force components (Fx-max, … Mz-min). DC(2) * DW(2) * T(2) * PV(12) = 96 internal rating cases are generated at each end (I-End or J-End) of an element.
Load Rating : Service
Bridging Your Innovations to Realities midas Civil
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Load Rating: Service
Post Tensioned Box Girder Load Rating
Bridging Your Innovations to Realities midas Civil
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Load Rating: Strength
Post Tensioned Box Girder Load Rating
Adjacent Vehicle Load
Vehicles can be defined as per :
AASHTO LRFD Caltrans AASHTO Standard User Defined
Defined vehicle Type 3S2 as per ODOT
1.8 m wheel spacing
Bridging Your Innovations to Realities midas Civil
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Post Tensioned Box Girder Load Rating
Load Rating: Strength
Primary vehicle Load
User Defined Permit Vehicle can be defined
Bridging Your Innovations to Realities midas Civil
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Post Tensioned Box Girder Load Rating
Primary vehicle Load
Influence Line for each wheel
Load Rating: Strength
Bridging Your Innovations to Realities midas Civil
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Material
Concrete Grade C4500 (4500 psi at 28days)
fc' = 3250 psi
Tendon
Type A572-50
Anchor Set 3/8 "
Friction Curvature 0.2
Friction Wobble 0.0
Reinforcement Grade60
Load
Dead Load Self Weight + SIDL
Live Load HL93-TRK, HL93TDM
& Permit Load
Prestress Pjack = 189 ksi
Post Tensioned Box Girder Load Rating
Introduction
Bridging Your Innovations to Realities midas Civil
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Reinforcement data
45' 37'
Bent 1 (Sup1)
Edge of Deck
Rebars
Left Right
Post Tensioned Box Girder Load Rating
Bridging Your Innovations to Realities
Load Rating Could be Critical
Pouya Banibayat, PhD Structural Engineer MIDASoft, Inc. [email protected] 646-852-9289