屋外環境下での風による機械的固定工法防水層の挙動の実測

概要

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The response of a mechanically anchored waterproofing membrane system located atop a building when subjected to local wind conditions was measured and the results analyzed to predict the stain in the membrane as a function of the average velocity profile at the site. A waterproofing membrane section having dimensions of 1.8m by 1.8m size was constructed atop the roof at an elevation of 44m of a 10story building located in Yokohama, Japan. The observed response of the membrane system was measured in terms of the strain generated in the membrane and the forces induced in the fasteners when subjected to local wind conditions. The test period took place early in the spring when typically at this location, higher average wind speeds occur. Results showed a corresponding relation between large strains in the membrane at higher wind velocities. The peak energy of the membrane was evident at two frequencies - an intermittent frequency of 5 to 8Hz caused by the natural frequency of the sheet and 0.1Hz which is representative of the wavy movement of a flag in the wind. However, the force occurring in the fastener was almost unchanged over this time.
社団法人日本建築学会の論文
2006-12-30