Merging flow from stairs from above and below, combined with storey exit

bs_9999_chapter_15_figure_6c

Calcualtes the merging flow from stairs above and below the final exit level, combined with with storey exit

Equations

W_{FE} = S_{up} + S_{dn} + W_{SE} or W_{FE} = B \cdot X + N \cdot X + 0.75 \cdot S_{up}

Number of people served by the stair from below the final exit level ( B )

Number of people served by the final exit level storey exit ( N )

Lesser distance from the final exit level storey exit or the lowest riser from the upward portion of the stairs ( D ) — m

Stair width for upward portion of the stair ( S_{up} ) — mm

Stair width for downward portion of the stair ( S_{dn} ) — mm

Width of the final exit level storey exit ( W_{SE} ) — mm

Minimum door width per person ( X ) — mm/person