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 analyze structure with low torsion members.
• Influence surface incorrect for model with different member releases at an earlier stage.
• Software crash when reselect analysis dead loading table drop down.
• Unable to transfer line beam automated dead load results unless live analysis performed.
• Unable to transfer footway bridge automated loads without fatigue load.
• Deck patch load not applied in case of too many divisions in a grillage.
• Unable to open grillage model due to corruption in carriageway definition.
• Invalid floating-point operation when accessing "Stressing and Tendon Data" for specific model.

Design Beams

• EU Pre-stressed beam: In-situ losses taken as a proportion of the composite section.
• EU Steel composite beam: Section classification and cross-sectional analysis issues:
  1. Update for Class 4 cross sectional properties due to a correction to internal compression elements according to EC 1993-5-1 Table 4.1,
  2. Enhancement for convergence issues when large axial compression acts on the beam,
  3. Various design report/beam plot corrections for "Combined Bending Axial and Shear" design check.
• EU Pre-stressed beam: α_cw condition not applied correctly in calculations near support.
• EU Pre-stressed beam: Erection design check: graphics does not match design report.
• EU Pre-stressed beam: External exception in SLS-Frequent design when either extreme fiber is in tension and error calculating cracking strain (negative fct,eff).
• Unable to use create new from template feature for Design Section and Design Beams.
• Reinforced concrete beam defined in a project after a Pre-stressed beam includes tendon data from the first beam.
• EU Pre-stressed beam: Shear calculations incorrect with high strength concrete.
• Pre-stressed beam: Error calculating perimeter.
• AASHTO LRFD Steel tub flange stiffener check 6.11.11.2-1 is modified.
• Correction relating to soil or SDL load case selection for "real" shear setting.
• Effective slab width for AASHTO Steel tub girders revised and skew adjustment removed.
• Pre-stressed beam: Tendons not active are shown in tendon location table but not shown in associated graphic.

Design Sections

• Initial strain applied on a cross section does not reduce spare capacity.
• EU Section: Accidental shear load values in output are incorrect.

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