Infrastructure analysis and design software

Software Option for Bridge and Civil products

RC Frame Design

The LUSAS RC Frame Design option builds upon the renowned modelling and analysis capabilities of LUSAS and extends the engineer’s workflow to allow design code checking of reinforced concrete members. It provides design code checking of regular and arbitrary shaped reinforced concrete decks/beams, piers/columns and piles subject to bending and axial force. Tapering and voided members are supported. Design checks due to bending with or without axial force can be carried out for reinforced concrete sections at the Ultimate Limit State (ULS) and Serviceability limit states (SLS).

The following design codes are currently supported:

AASHTO LRFD 8th LRFD Edition. (USA) - AASHTO LRFD Bridge Design Specifications 8th edition, American Association of State Highway and Transportation Officials 2017.
AS5100.5-2017 (Australia) - AS5100.5:2017 Australian Standard – Bridge Design – Part 5: Concrete Standards Australia/ Austroads, Sydney NSW, March 2017.
CSA S6-14 (Canada) - CSA S6-14 Canadian Highway Bridge Design Code. Canadian Standards Association, December 2014.
EN1992-1:2004 - EN 1992-1-1:2004 +A1 Eurocode 2: Design of concrete structures Part 1-1: General rules and rules for buildings.
EN1992-2:2005 - EN1992-2: 2005 Eurocode 2: Design of concrete structures Part 2: Concrete bridges - Design and detailing rules.
IRC:112-2011 (India) - IRC:112-2011 - Code of Practice for Concrete Road Bridges. Published by Indian Road Congress, November - 2011


Defining reinforcement

  • Define layers of reinforcement by entering rows of table data (cover, allowance for links, number of bars, bar diameter etc.) for each numbered face in a chosen cross-section.
  • Bars are spaced equally, and where bars in different faces are shown to clash, end bars from selected faces may be omitted.
  • Use multiple rows of table data to position bars in multiple layers within a face, or to specify more dense or sparse reinforcement within a layer. Alternating bar arrangements and manual bar placements are also supported.
  • Bar spacing, as used for determination of crack widths, is calculated by considering where each bar, or any bundled bars are with respect to other bars in the section.
  • Specify how individual reinforcement arrangements apply over a length of a line, or over multiple lines that represent a concrete member.

Typical section reinforcement definitions.


Specifying multiple reinforcement arrangements for a member (or series of members)

Viewing design results

  • Select results components for individual design checks, and obtain maximum utilisation factors in all, or selected members.
  • View results as Utilisation ratios on a results viewing layer for a selected design code, and active loadcase, load combination or envelope.
  • Produce a tabular summary of design check results for selected members and loadcases, view detailed results and generate interaction diagrams.
  • Save results for use with Microsoft Excel, or add them to a model report, and each time the report is generated the reported design data will be automatically updated to match the current state of the model.

Utilisation contour plot

Summary results

View design check results in a tabular form.

Detailed results

Examine detailed results

Interaction diagrams

Display interaction diagrams

Watch the RC Frame Design option in action

See our video index for other related videos

In summary

  • Extend your workflow from analysis into RC deck/beam, pier/column and pile design.

  • View results as Utilisation ratios on a results viewing layer for a selected design code, and active loadcase, load combination or envelope.

  • Produce summary information in tabular and report-based formats and easily see pass/fail values

  • Create design reports individually or append them to the report for the whole model. Mix summary reports for the whole structure with detailed reports of critical members. Create templates to speed reproduction of similar content.

  • Learn it fast. Existing users can easily apply the new RC frame designer because it works in a similar way to other tools they have become familiar with.

The capacity of the RC frame design module to deal with complex section geometry has been fundamental in allowing us to carry out design checking of the individual members of the structure within a limited timescale.

Its use is straightforward, from the definition of the geometric properties, to the post-processing and viewing of the results. 

Ultimate and serviceability limit state checks can be viewed by either plotting contour maps of the utilization coefficient on members of the structure, or by tabulating all or selected details for members of interest and including that data in a model calculation report.

Carlo Margheriti, Senior Engineer, Alhambra srl.


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LUSAS is a trademark and trading name of Finite Element Analysis Ltd. Copyright 1982 - 2020. Last modified: September 04, 2020 . Privacy policy. 
Any modelling, design and analysis capabilities described are dependent upon the LUSAS software product, version and option in use.