Upload
vuongkhue
View
251
Download
7
Embed Size (px)
Citation preview
Bridging Your Innovations to Realities
2
1. Objective
2. General Overview - midas Civil Software
3. Introduction – Balanced Cantilever Bridge
4. Live Modelling – Balanced Cantilever Bridge
Contents
Bridging Your Innovations to Realitiesmidas Civil Training Series
3
1. Objective
1.0 To model and analysis of Balanced Cantilever Bridge in midas Civil.
2.0 To introduce the fast way of modelling through “Wizard” which consist of
not only modelling but boundary condition, static loading, construction stages
etc..
3.0 By the end of the series attendees will be conversant with FCM bridge
wizard for modelling of Box Girder Bride.
Objective
Bridging Your Innovations to Realitiesmidas Civil Training Series
4
1. Objective
General Overview
• Midas Civil Overview
• Balanced Cantilever Bridge Introduction
• Project Introduction
• Webinar Model Introduction
• Modelling
Modelling
• Fixed Support
• Point Spring Support
• Elastic Links & Bearings
Loading
• Point, Beam Load
• Temperature Load
• Moving Load
• Prestressed Tendon
Construction Stage
• Construction Schedule
• Structure, Boundary, Load Group
Perform Analysis
& Results
• Reaction, Deformation, Force, Stress
• Moving Load Tracer
• Tendon Loss Graph
Day One Day Two Day Three
5
1. Objective
2. General Overview - midas Civil Software
3. Introduction – Balanced Cantilever Bridge
4. Live Modelling – Balanced Cantilever Bridge
Contents
Bridging Your Innovations to Realitiesmidas Civil Training Series
6
1. General Overview
Distributed worldwide & Leader in high profile projects
A partial list of Users
URS Corp. Michael Baker Jr.T Y Lin
PennDOT California DOTFlorida DOT Oregon DOT
Arup
Maunsell AECOM GroupOTAK
Burgess & Niple
Ministry of Transportation of OntarioRoyal Haskoning
McCormick Rankin Corp.
COWI
Roughan & O'Donovan
Figg Bridge Engineers
Parsons Corp.Hyder
Delcan
WSP Scott Wilson Strasky, Husty
HalcrowHNTB Corp.
Parsons & Brinckerhoff
Akins
Midas Civil is FEA software for analysis & design of Bridges
Bridging Your Innovations to Realitiesmidas Civil Training Series
7
1. General Overview
Cable stayed bridge & Extra-dosed bridge
Staged segmental post-tensioned bridge
Curved steel plate and composite girder bridge
Conventional bridge (Skewed slab, Frame & Culvert)
Suspension bridge
Application Areas
Integral bridge
Subway structure
Tunnel structures
Sewage treatment plant
Heat of hydration for mass concrete
Advanced Technology
Bridging Your Innovations to Realitiesmidas Civil Training Series
8
Analysis and Design
Analysis only
2-D 3-D
General Purpose
Special Purpose
FEM FBM BEM
Structural Engineer
Geotechnical Engineer
Bridge Underground Structure Building
Plant Tunnel Dam
Why midas Civil
Bridging Your Innovations to Realitiesmidas Civil Training Series
9
1. General Overview
Conventional Bridge
Staged Segmental Bridge
Cable-stayed Bridge & Suspension Bridge
Bridging Your Innovations to Realitiesmidas Civil Training Series
10
1. General Overview
Railway bridge Rail track-structure interaction
Underground structureSubway station
Purification plant
Soil-structure interaction
Nonlinear static
Nonlinear time history analysis
Offshore structure Wave load
Seismic analysis
Response spectrum analysis
Pushover analysis
Inelastic time history analysis
Nonlinear time history analysis with damper or Isolator
Multiple support excitation
Detailed analysis
Linear local buckling analysis of steel member
Plastic analysis of connection (Mohr-Coulomb, von-Mises)
Heat of hydration analysis
11
1. Objective
2. General Overview - midas Civil Software
3. Introduction – Balanced Cantilever Bridge
4. Live Modelling – Balanced Cantilever Bridge
Contents
Bridging Your Innovations to Realitiesmidas Civil Training Series
12
1. Introduction – Balanced Cantilever Bridge
1. Balanced cantilever construction implies construction of cantilever segments from a pier in a balanced fashion on each side until the mid span is reached and a closure known as stitch/key segment is made with other half span cantilever constructed from the preceding pier.
2. The procedure is as follows:
The form work is suspended from the end of the last segment.
The new segment is cast and once the concrete has developed a predetermined strength, the section is post tensioned to the rest of the bridge.
The same erection process is repeated till the structure is completed.
Bridging Your Innovations to Realitiesmidas Civil Training Series
13
1. Introduction – Balanced Cantilever Bridge
Stitch Segment
End SpanPSC Segments
Bridging Your Innovations to Realitiesmidas Civil Training Series
14
1. Introduction – Balanced Cantilever Bridge
Bridging Your Innovations to Realitiesmidas Civil Training Series
15
1. Introduction – Balanced Cantilever Bridge
FCM (Free cantilever Method)
1. It is generally used in a terrain where obstacles such as rivers, creeks and roads lie under
the bridge, which present difficulties in installing conventional shoring.
2. FCM is generally used for long span bridges, which are typically accompanied with high
piers.
3. Since it involves constructing balanced cantilevers from a pier, it is often referred to as a
balanced cantilever bridge.
Bridging Your Innovations to Realitiesmidas Civil Training Series
16
1. Introduction – Balanced Cantilever Bridge
1. Less Space Required Construction in urban area where temporary shoring would disrupt traffic services below.
2. Less Formwork Required
3. Larger Spans Useful where span length is more but launching of girder is not possible.
1. More efficient, safe and economical Easy adoptability to curvature and super elevation.
Useful for odd sizes, single span etc.
Bridging Your Innovations to Realitiesmidas Civil Training Series
17
Construction over a working flyover
Bridging Your Innovations to Realitiesmidas Civil Training Series
18
Construction over Railway lines
Bridging Your Innovations to Realitiesmidas Civil Training Series
19
Suitable for Longer Spans
Bridging Your Innovations to Realitiesmidas Civil Training Series
20
Considerations for a Bridge Engineer
1. CamberDue to cantilever action there will be some deformations, due to which, some construction defects may arise, specially when installing the stitch segment
2. Prestress Losses
3. Creep and Shrinkage Effect
4. Proper Construction Sequences
21
1. Objective
2. General Overview - midas Civil Software
3. Introduction – Balanced Cantilever Bridge
4. Live Modelling – Balanced Cantilever Bridge
Contents
Bridging Your Innovations to Realitiesmidas Civil Training Series
22
4. Live Modelling – Project Introduction
Introduction
Bridging Your Innovations to Realitiesmidas Civil Training Series
23
4. Live Modelling – Project Introduction
Introduction
Euro and British code have been used for the model
Material : CEB-FIP
Moving Load
User defined load have been defined
Bridging Your Innovations to Realitiesmidas Civil Training Series
24
4. Live Modelling – Model Introduction
Specification of Structure
Bridge Type: Balanced Cantilever Bridge
Span Length: 48m + 77m + 49.5m
Width: 10.13 m
Moving Loads: IRC
Time Dependent Material: IRC112:2011
Structural plan layout
Internal Piers are monolithic and have a diameter of 5m.
Bridge has a uniform radius of curvature of 182m.
Bridging Your Innovations to Realitiesmidas Civil Training Series
25
4. Live Modelling – Model Introduction
Box Section
Near mid span Near Int. Pier
Loading Details
1. Self Weight of the Structure
2. Wet Concrete Load
3. Form work Load
4. Prestress
Day 2
1. Moving Load
2. Response Spectrum
3. Temperature load
Bridging Your Innovations to Realitiesmidas Civil Training Series
26
4. Live Modelling – Model Introduction
Prestress
Type of Tendon used :
1) 19T15
2) 17T15
72 No. of total tendon used
1395 N/mm2
Bridging Your Innovations to Realitiesmidas Civil Training Series
27
02Deciding Lane Placement
.
First we need to decide where to
place lanes over the deck.
Crash Barrier of 1m each on both
ends
Carriageway Width : 10.13-2 =
8.13 m
According to IRC 6 Table 2:
Live Load Combination
For Carriage way Width
5.3< CW <9.6
We have 2 Combinations
1. 1 Lane of Class 70R
running with minimum
Eccentricity from the kerbs
2. . 2 Lanes of Class A
running with minimum
Eccentricity from the kerbs.
So, we need to define 3 lanes.
Load > Moving Load > Traffic Line Lanes