抄録
On an actual domed structure with membrane roofs, changes with time and distributions in the. snow loads on the roof were investigated using a method based on estimations from the increase in membrane strain. And the sliding behavior of snow blocks was observed by combining video images with 3-dimensional CAD images. The following were confirmed :
1. The accumulated snow on the Dome disappeared sooner than that deposited on the ground and on the flat roof model. This tendency was particularly marked on the middle and lower parts of the Dome, due to frequent snow sliding.
2. Immediately after snowfall started, the distribution of snow load on the Dome was relatively uniform over its entire surface, then it gradually changed into a hill-shaped distribution by gradual accumulation of snow on the upper part and frequent sudden reductions of snow load on the lower part by sliding. When the snow load was at its maximum value, the load on the middle part was larger than that on the upper part, and the load on the lower part was extremely small.
3. The shape coefficient of the Dome to the flat roof model was large initially without exceeding 1, and took the smaller value when the snow load was at its peak value.
4. The course of the snow sliding on the Dome, which speed was relatively low, was close to the uniform motion.
