Autodesk^® Structural Bridge Design 2018 introduces post-tensioned concrete beam design to AASHTO LRFD 7th Edition and 3D interaction surfaces for design sections.

• Autodesk Structural Bridge Design 2018 New Features
• Primary Issues Resolved By This Release

• Post-tensioned concrete beam design to AASHTO LRFD 7th Edition.
• 3D interaction surfaces for design sections giving performance ratio for multiple loads.
• Support for high DPI displays.

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Project / Structural Analysis

• Unable to view tabular results with numeric format set to certain regions such as English-Malaysia.
• Unable to enter a real value into the Tabular Results grid Custom Filter or Filter Builder.
• Show nodes check box on 3D elements graphics not displaying state.
• Software crashes and corrupts the registry key for units when a .sam file has been changed to a .sst file and is attempted to be opened.
• Copying a block of finite elements in a sub-model to a new location deletes other elements in the model.
• Improved memory allocation for analysis of large models.
• Dynamic analysis fails with "Invalid Poisson's ratio" error message in log file when a FE density modification has been applied.
• Error message and subsequent crash when load optimization carried out on AU rail structure.
• SLS envelope is not created for BD 86/11 load optimization.
• Steel composite beam "long term" and "short term" property assignments have no effect.
• AS5100 load optimization fails with error for a six lane carriageway.
• If design code is changed from EU to BS, the concrete material strength is not mapped appropriately.
• Solved load cases in loading set 1 become unsolved when solving loading set 2 in ASBD 2017.
• AS5100 load optimization fails on specific curved carriageway geometry.
• Line girder differential temperature calculations are incorrect for cracked concrete regions.
• Version not reported correctly for OS greater than Windows 8.

Design Beams

• Tendons not included in calculation of d₀ distance in AS5100.5 Cl 2.5.4.
• AASHTO LRFD time development factor k_td set lower than the minimum 1.0.
• Calculation of section perimeter is incorrect for some precast sections, e.g. section with continuous face.
• BS5400 steel composite beam longitudinal shear for sections with haunch not correct.
• Incorrect automated dead loads shown on graphics for line girder with associated design sections.
• BS post-tensioned beam construction sequence loading is generated incorrectly for multi span beams.
• Post-tensioned beam access violation when trying to display primary prestress effect.
• Post-tensioned beam reinforce faces does not work.
• EU pre-stressed beam ULS shear analysis can hang.
• AU pre-stressed beam ULS analysis can hang.
• EU NDPs maximum compression strut angle cannot be reset above 1.0.
• AU pre-stressed beam analysis "Class" is grayed out and cannot be reset in ASBD 2017.
• Pre-stressed beam tendon exit height can now be controlled by setting the deflection angle via the edit tendon attributes form.
• 'Control has no parent window' error message may appear when closing a material form.
• EU pre-stressed beam live bending printout error for missing variable may appear.
• EU pre-stressed beam tensile stress limits at transfer are incorrect.
• Pre-stressed beam tendon location form graphics shows all section locations rather than just the current section.
• Unable to redefine pre-tensioned beam components due to "array boundary overflow" error.
• Generated shear loads can be incorrect when "absolute shear" is selected on pre-tensioned beam loading form.
• Post-tensioned beam section property correction in stress summary table dependent on available parasitic effects.
• EU pre-stressed beam erection load case stress result may not be consistent or correct.
• EU pre-stressed beam fails frequent SLS case but reason is not clear.
• BS reinforced concrete beam shear reinforcement summary incorrectly gives a link spacing of zero along the whole beam length.

Design Sections

• Additional limiting capacity may be shown incorrectly on analysis form.
• AASHTO LRFD interaction curve resistance factor incorrectly calculated as 1.0 instead of 0.75 on many curve points.
• Section analysis fails with access violation error in ASBD 2016.
• EU Section analysis fails with error message for shear for user section in ASBD 2017.
• Incorrect torsion when joining section elements in ASBD 2017.
• Control iterations settings are not reset after deselecting a loadcase.
• Iteration control input strains do not give consistent out of balance forces.
• EU crack width calculations have error in printed results.
• Access violation when clearing unassigned materials.

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