bridging your innovations to realities -...

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

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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


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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

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1. Objective




Contents


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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


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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


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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


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1. General Overview

Conventional Bridge

Staged Segmental Bridge

Cable-stayed Bridge & Suspension Bridge


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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

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1. Objective




Contents


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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.


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Stitch Segment

End SpanPSC Segments


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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.


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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.


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Construction over a working flyover


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Construction over Railway lines


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Suitable for Longer Spans


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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

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1. Objective




Contents


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4. Live Modelling – Project Introduction

Introduction


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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


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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.


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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


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Prestress

Type of Tendon used :

1) 19T15

2) 17T15

72 No. of total tendon used

1395 N/mm2


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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


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