Experiment 02
The wheelchair ramp between a street and a building entrance. A different subject from the car ramp, with its own source and its own numbers; the rules of one are never applied to the other.
01Slope
Slopes here are written as ratios: 1 to a number. The steepest allowed is 1:12.
For a level difference of 0.45 m at 1:12: one run of 5.40 m and a landing of 1.80 m at each end, 9.00 m in all.
Try itChange the slope, and drag the entrance level.
02Runs
A single run may not rise more than 0.75 m, and may not be longer than the length given for its slope: 9.00 m at 1:12, 12.00 m at 1:16, and 15.00 m at 1:20.
So a higher entrance is reached by several runs separated by level landings: one at the bottom, one at the top, and one between every two runs. The number of landings is the number of runs plus one.
For a level difference of 3.00 m at 1:12: 4 runs of 9.00 m each, 5 landings, 45.00 m in all.
Try itRaise the entrance level, and watch the available length.
03Width
The minimum width follows the building: 1.50 m for a public building, 0.90 m for shared residential, 0.80 m for a single dwelling. A landing is at least as wide as the ramp.
When the ramp rises more than 0.60 m, handrails are required: between 0.84 m and 1.00 m high, extending 0.30 m beyond each end. Edge protection is at least 0.05 m with handrails and 0.075 m without.
Try itChange the width and the building type.
The wheelchair-user outline in the drawing is 1.10 m × 1.35 m, for illustration only, and is unverified.
The following values are from the Jordanian building requirements code for persons with disabilities, Jordan National Building Council.
The wheelchair-user outline in the drawing is for illustration only and is not from the source.
This is an experiment for explanation. It does not replace the governing code or the design engineer.