Bridge analysis: Automatic path generation

Automatic UK/HK path generation

Carriageway paths are first split into Lane Paths between 2.5m and 3.65m wide in accordance with BD37. Next, vehicle paths along the division between lanes are defined. Influence analysis is carried out on these key paths. Additional vehicle paths are then set up at 1.75m from the edge of each lane and at 4.25m (1.75m + 2.5m) from the edge of each lane. Influence lines on these paths are determined by linear interpolation. These will then be used during carriageway optimisation.

Automatic EC1 path generation

Carriageway paths are first split into lane paths 3m wide starting at first the extreme left then from the extreme right of the carriageway in accordance with EC1. Next, vehicle paths along the division between lanes are defined. Influence analysis is carried out on these key paths. Additional vehicle paths are then set up at 4m from the edge of each lane. Influence lines on these paths are determined by linear interpolation. These will then be used during carriageway optimisation.

Carriageway path load optimisation is performed automatically after the influence analysis. Basic bridge loads are derived as for lane by lane optimisation and then combined in accordance with the rules in the UK NA to EN1991-2 to give a single maximum (most positive) and minimum (most negative) static bridge Load case for each influence effect. The lane factors for each possible transverse position of the SV/SOV vehicle and the effect of each case are available in the EC1 optimisation summary output table.

Automatic US path generation

Carriageway paths are first split into lane paths 12 ft wide starting at first the extreme left then from the extreme right of the carriageway. Loading will then be applied to 10 ft wide strips to left or right of these lanes.

Automatic Australian path generation

Carriageway paths are first split into lane paths 3m wide starting at first the extreme left then from the extreme right of the carriageway.