ABES preTee 2.0
Design of Super-Tee Bridges
powered by SOFiSTiK
25.03.2008 12:48
The software package preTee for the computer-aided modelling and design of Super-Tee bridges was introduced to the Australian market at the last AUSTROADS bridge conference in 2006. The preTee module utilises the well-proven structural engineering package SOFiSTiK and takes advantage of its advanced computing capabilities which includes features such as the automatic consideration of time-dependent effects, traffic loading using influence surfaces, non-linear cross-section analysis for ULS and SLS checks among others.
preTee offers an easy-to-use user interface for the quick definition of the structural system of Super-Tee bridges including multiple spans, the loading and the load combinations along with the construction sequence. Traffic loading is evaluated considering all relevant rules of AS 5100 including the correct combinations of loaded lanes and the design envelopes for ULS and SLS checks are automatically created. Also provided within preTee are automated design checks for PT and reinforcement design according to AS 5100.
The numerical model generated automatically by preTee consists of a combination of beam elements for the pre-cast beams, orthotropic plate elements for the onsite slab and spring elements simulating support conditions and link slabs. The model is 3-dimensional and meshed automatically allowing for the precast beam design and the slab design as a full 3 dimensional system.
In January 2008 version 2.0 of preTee was released, this new version offers considerable improvements and additional functionality resulting from feed back from existing Australian customers.
In the new version detailed modelling of continuity across piers has become possible. In addition to the traditional approach where individual spans are modelled as simply supported areas preTee version 2.0 offers input options to model link slabs, diaphragms or rigid connections with cross-beams in great detail. This new functionality helps to economise designs by considering existing hogging moments across supports, effectively reducing design sagging moments in mid-span.
While the first version of preTee enabled the modelling of complex geometries, preTee version 2.0 also offers many new functions enabling the layout of Super-Tee beams to accurately model actual conditions. This includes the modelling of splayed beam arrangements with the number beams on each span also being a variable. When this functionality is coupled with the curved alignments, skew supports and variable span lengths the possible layouts are endless. Furthermore a detailed list is generated in the report listing the bearing coordinates, beam positions and beam lengths.
The cross-section library has been extended and now also includes deck units in addition to the standard Super-Tee sections. The available cross-section templates follow the recommendations given in the AS 5100 – however, adjustments for particular project-specific modifications are possible.
Automated definition of traffic loading has been extended by including HLP and railway loading. When using HLP loading the co-existing M1600 loading on the remaining lanes is automatically considered using a lane factor of 0.5 as specified in the AS 5100. Railway loading (LA300) has also been implemented with great detail including derailment load cases and the option to alter axle loads and railway gauges.
Numerous small details have been added in order to account for various specifications given in the AS 5100. For example, a region parameter can be set to specify the creep parameters; concrete cracking in the lateral direction can be considered by using different slab thicknesses in the longitudinal and lateral deck direction; PT losses during curing can be considered; definition of reinforcement within the cross-sections has been improved and many more.
Last – but not least – it should be mentioned that a user manual is finally also available as part of version 2.0.
preTee version 2.0 is marketed in Australia by ABESOZ in two different constellations. Firstly, as a stand-alone package for the application in Super-Tee bridge design only. This package retails for AUD 10,000.00; and secondly as an add-on to the general bridge design package. preTee is being used by several leading consultants and road authorities in Australia.
A Eurocode-ready version is under development and will be available by end of 2008
More info about ABESOZ:
- Files:
preTee_SOFiSTiK_Structural_Desktop_Dialogue.tif- preTee_SOFiSTiK_Structural_Desktop_Interface.tif
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