On the Wind Pressure related with the Gustiness and Maximum Wind Velocity in Japan

[摘要] The wind gustiness has been disregarded at the calculation of wind pressure upon the construction, however, its effect is never negligible but it is the very important part of the wind presure. In this paper, the motion of a simple pendulum exposed to the natural wind was discussed as a model of a construction and it was found that the wind pressure due to the wind gustiness was very large and was about 3 times that due to mean wind. Next, the effective wind velocity, that is to say, wind velocity of laminar flow which will deform the construction in same magnitude with the natural wind, was defined. The effiective wind velocity is the function of mean wind velocity and the nature of the construction, and it was found that it was about 2 times of wind velocity which was recorded at the meteorological observatory. Thus, the maximum wind pressure is calculated by usual wind pressure formula by replacing effective value in wind velocity. Further, the distribution of maximum wind velocity in Japan was researched, and it was cleared that the maximum wind velocity was affected greatly by the topography.

[学科分类] 大气科学