一方向型吊屋根構造の耐風安定性 : その 1 現象

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タイトル別名
  • AERODYNAMIC STABILITES OF "ONE-WAY" TYPES OF HANGING ROOFS : Part 1; Phenomena
  • 一方向型吊屋根構造の耐風安定性-1-現象
  • 1ホウコウガタ ツリヤネ コウゾウ ノ タイフウ アンテイセイ 1 ゲンショウ

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Some series of experiments were made on the behavior of "one-way" types of hanging roofs in smooth uniform flow by use of the Effel types of wind tunnel. Models were 450mm in span, 300mm in breadth and 114mm in height and their roofs were covered with vinyl sheets having some thin pipes. Wind velocity of oncoming flow and flow around roofs were measured by hot-wire anemometer and disturbances of wind pressure in close vicinity to roofs were measured through a pressure transducer. Projecting pictures taken with 8mm cine-camera on screen, amplitudes, periods and displacements were measurd. From these experiments, the following features seem to be deduced. According to larger wind velocity of oncoming flow, amplitudes show peaks after graduall increase in initial state and exhibit tendencies to decrease slowly beyond peaks. On the otherhand, periods of wind pressure decrease slightly and seem to be close on the increased period of roofs. The first mode of oscillation is dominant over all the others and static deformation of roofs can be represented by a few, lower order terms of Fourier series between the starting velocity where the amplitudes begin to increase enormously and the peak velocity. Both the starting velocity and the peak velocity become large in proporition to the weight of roofs. Moreover, from distributions of mean wind velocities and intensities of mean wind velocities and intensities of turbulences, The ratio of mean velocity in separated domain to oncoming flow velocity in deduced.

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