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LUSAS Papers and Presentations

The LUSAS papers and presentations listed on this page have been presented at the conferences stated. To view, click on a hyperlink or the image of either the paper, or the presentation, (if a link is provided).  

Video controls and a full screen option are provided at the bottom of each presentation video during playback.

See also: 

LUSAS Webinar recordings

LUSAS Video / Presentation Sessions

 

Title and abstract Paper Presentation

Finite Element Analysis of Joints, Bearings and Seismic Systems

  • Paper presented at the 8th World Congress on Joints, Bearings and Seismic Systems, Atlanta, Georgia, USA, 25-29 September 2016 by Terry Cakebread of LUSAS.

  • Describes and illustrates the different ways that joints, bearings and seismic systems can be modelled, covering the relevance of using different finite element joint models in differing situations, These include different ways to model lift-off behavior (smooth contact or elastic-plastic joints); the use of more advanced joints for modeling lead rubber bearings and friction/pendulum bearings; why dampers and other seismic systems are employed and the methods of modeling them; and some more detailed bearing models including carrying out bearing repairs in situ and ways of modelling detailed bearing models with full contact behaviour.

  • View paper | View presentation

  • Duration : 24:11


Integral Bridges and the Modeling of Soil-Structure Interaction

  • Paper presented at IBC 2014 by Steve Rhodes and Terry Cakebread of LUSAS.

  • At the time of writing the paper, no standard approach for the analysis of integral bridges appears in AASHTO LRFD Bridge Design Specifications or other international codes. This paper considers the approaches most suitable for modeling common integral bridge forms, expanding upon recent guidance regarding soil-structure interaction approaches. Issues including material properties, initial stress state and the incorporation of the effects of soil ratcheting are discussed and both continuum and spring-type finite element models are explored.

  • View paper | View presentation

  • A similar presentation for a paper presented at the European Bridge Conference in 2015 referencing metric units can also be viewed here.

  • Duration : 25:07


Understanding Buckling Behavior and Using FE in Design of Steel Bridges

  • Paper presented at IBC 2013 by Stephen Rhodes and Terry Cakebread of LUSAS.

  • Describes how Finite Element (FE) analysis can be used to predict buckling modes, highlighting methods which are practical for day-to-day use.  It explores some criterion which might be used to identify if such behavior, including global buckling modes, should be of concern to the designer, drawing on recommendations including those in the recently published NCHRP Report 725 and Eurocodes.  Use of FE in the determination of member resistances is also explored.

  • View paper | View presentation

  • Duration 28:13

Rating and Upgrading of Steel Bridges using Finite Element Modeling

  • Paper presented at 7th New York City Bridge Conference 2013 by T. Cakebread and S. Rhodes of LUSAS.

  • Describes how Finite Element (FE) modeling techniques can assist in the assessment (rating) and upgrading of steel bridges of various types. Global and local modeling options are considered with reference to several projects, in particular the West Gate Bridge in Melbourne, Australia. The use of different analysis assumptions, element types, eigenvalue and nonlinear analysis functions to achieve greater load rating capacity is outlined, identifying examples of good practice and drawing on international codes and literature for recommendations.

  • View paper | View presentation

  • Duration : 27:39

Assessment and upgrading of Steel Bridges using Finite Element Modelling

  • As presented at IABSE 2013 by Philip Icke and Steve Rhodes of LUSAS.

  • This paper describes how Finite Element (FE) modelling techniques can assist in the assessment (rating) and upgrading of steel bridges of various types. Global and local modelling options are considered with reference to several projects, in particular the West Gate Bridge in Melbourne, Australia. The use of different analysis assumptions, element types, eigenvalue and nonlinear analysis functions to achieve greater load rating capacity is outlined, identifying examples of good practise and drawing on international codes and literature for recommendations.

  • View paper


The Benefits of Elastic and Nonlinear FE Buckling Analysis Over a Codified Approach 

  • As presented at a workshop session at NASCC (incorporating the World Steel Bridge Symposium) 2012 by Terry Cakebread of LUSAS.

  • The assessment or load rating of existing structures to requirements is often over-conservative and can suggest they can "fail" buckling checks, but analysis with software can often reveal additional capacity. For new structures, where buckling during erection could be critical, FE analysis permits additional checks to be carried out. For existing and new structures, material and additional bracing/stiffeners can be optimised by carrying out FE analysis. See how this is done using LUSAS FE software.

  • View presentation

  • Duration: 23:03

3D Considerations in Bridge Design 

  • As presented to the AASHTO T-19 Technical Committee in 2012 by Terry Cakebread of LUSAS.

  • View presentation

  • Duration: 17:46

The Benefits and use of FE modelling in Bridge Assessment and Design

  • As presented at IABMAS 2012 by Philip Icke of LUSAS and Carlo Margheritti of LUSAS (Italia).

  • Structural analysis has progressed a long way from hand calculations and from when distribution factors first started to be used. From the first computer methods, grid and grillage analysis techniques evolved, leading through progressive enhancements to the advanced 3D graphical and analytical tools that we see and use today. Finite element (FE) modelling and analysis is being used more for bridge engineering because of the more economical and accurate assessments and designs its use produces. This paper illustrates the role that it can play in just some areas of bridge analysis, assessment and design with reference to bridge assessments and designs carried out by consultants on projects around the world.

  • View paper


International Bridge Analysis Seminar "Assessment and rehabilitation of bridges" (IBAS 2012)

A one-day seminar held at the Institution of Structural Engineers in London on 7 March 2012 exploring structural idealisation and finite element modeling of steel, concrete and masonry structures for assessment work.

Presentations were made by LUSAS and by invited speakers. 

Selected presentations are shown below.


Keynote address: What a difference a day makes - how analytical effort saves structures 

  • As presented at IBAS 2012 by Chris Hendy, Head of Bridge Design and Technology, Atkins.

  • The benefits obtained from using linear and nonlinear analysis to assess a number of bridge structures of both steel and concrete construction is described. The reasons behind the need for a detailed structural assessment of the regions of interest for each bridge are also briefly explained and the assessment and analysis methods used are covered in more detail showing that potential savings by reducing / eliminating strengthening can more than compensate for the additional asessment cost.

  • This is a restricted presentation. Please contact support@lusas.com if you wish to view this.

  • Duration: 27:45

Structural Idealisation for Assessment

  • Duration: 20:21

Steel Bridge Assessment

 

  • Duration: 19:07

West Gate Bridge Upgrade

  • As presented at IBAS 2012 by Peter Robinson of Flint & Neill.

  • The West Gate Bridge upgrade works were undertaken by an Alliance in which Flint & Neill had the major responsibility for the assessment and strengthening design for the steel bridge; advice on inspection, operation and maintenance; developing designs for early works improved access; and for producing a current set of electronic as-built drawings from historical documents and original drawings. In this presentation the use of global and local finite element analysis for strengthening of the steel box girder, by cantilever propping, internal stiffening, and post-tensioning; and for the management of construction loads is described.

  • This is a restricted presentation. Please contact support@lusas.com if you wish to view this.

  • Duration: 17:03

Modelling Concrete Bridges for Assessment

  • Duration: 21:44

LUSAS Concrete Material Models - Theory

  • As presented at IBAS 2012 by Tony Jefferson of Cardiff University.

  • The presentation provides insight into the material models which control the behaviour of concrete in LUSAS. The presentation concentrates on the simulation of cracking and crushing behaviour but also describes a recently developed model for early age concrete behaviour. A particular focus is on the importance of modelling crack closure behaviour and aggregate interlock. The inaccuracy in predictions which do not account for such behaviour (as is the case with many existing concrete models) is highlighted using results from an experimental reinforced concrete beam.

  • This is a restricted presentation. Please contact support@lusas.com if you wish to view this.

  • Duration: 27:20

Masonry Arch Assessment

  • Duration: 14:41

Assessment of Brick Vaulted Arches

  • As presented at IBAS 2012 by Danny Boothman of URS.

  • This presenation provides an overview of the Platforms 12 & 13 Design & Build Contract at Glasgow Central Station, which required the provision of support to 2x340m of new permanent way (P-way), and goes on to explain how detailed assessment of  vaulted arch geometries (that were constructed in the early 1900ís and not previously exposed to rail loading) were analysed using LUSAS to confirm their adequacy for the required RA8 assessment loading.

  • This is a restricted presentation. Please contact support@lusas.com if you wish to view this.

  • Duration: 23:22

The Use of Finite Element Analysis in the Design of Footbridges

  • As presented at Footbridge 2011by Philip Icke of LUSAS.

  • This paper aims to highlight the benefits of using finite element (FE) analysis for different types of footbridge design and illustrate those benefits with reference to a diverse range of urban regeneration footbridges of various construction materials. Key analysis tools highlighted include those for calculating member resistances for linear and nonlinear buckling analysis, dynamic analysis capabilities, pedestrian loading, energy dissipation devices and staged construction modelling. The paper concludes that the use of finite element analysis can lead to more efficient, cost-effective footbridge designs and that its use is just as valid for low-cost "practical" footbridges as it is for the design of more technically advanced and expensive "iconic" structures.

  • View paper


Finite Element Analysis of Joints, Bearing and Seismic Systems

  • As presented at IJBRC 2011by Terry Cakebread of LUSAS.

  • Describes and illustrates how advanced Finite Element Analysis (FEA) software has been used to model joints, bearings and seismic systems on a variety of projects worldwide. The paper illustrates the different ways that bearings can be modeled and covers the relevance of using different finite element joint models in differing situations, including different ways to model lift off behavior (smooth contact or elastic-plastic joints); highilights the use of more advanced joints for modeling lead rubber bearings or friction/pendulum bearings; discusses why dampers and other seismic systems are employed and covers the methods of modeling them. Examples of detailed bearing models with full contact behavior are shown.

  • View paper


See also: 

LUSAS Video / Presentation Sessions

LUSAS Webinar recordings


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