[in Japanese]

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Measurement techniques of wind in the atmosphere are shown. Direct measurements of wind are realized only near the surface A sonic anemometer can measure the fine structure in a atmospheric boundary layer and evaluate the turbulent transfer mechanism. Remote sensing techniques using the sound and radio wave are utilized to survey the wind structure in the upper layer. Recent measurement systems are introduced briefly.

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This paper describes the revised wind load provision of the Building Statutes. The Building Standard Law that is the fundamental one in the Building Statutes and the basic things including the objective of the Statutes, basic performance requirements on buildings and etc. are prescribed in it. It was revised in 1998 and declared that technical regulations should been prescribed with the performance based forms. Following the revision, the Building Standard Law Enforcement Order and Notifications of Ministry of Construction that form the technical regulations including design load provisions were revised in 2000. Wind load provision was revised along with the other provisions. In this paper, the revised wind load provision is presented as well as the revision works

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In Japan, the wind-resistant design of highway bridges are conducted according to the Specification for Highway Bridges, the Wind Resistant Design Manual for Highway Bridges, or specific design specification based on the Wind Resistant Design Standards for Honshu-Shikoku Bridges. In this paper, the existing wind resistant design methods for highway bridges are outlined first. Then the revision plan for the Wind Resistant Design Manual for Highway Bridges are introduced.

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The new type of conductoreduced the drag coefficient (15%) and wind noise (10dBA) was developed. The authors carried out the water flow tunnel test, wind tunnel test and full-scale field test for confirming the reducing mechanism of drag coefficient and evaluating the reduction value of drag coefficient. This paper reports these test results and some evaluations.

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Some kinds of sports ball aerodynamics are discussed on a basis of erratic flight motion in air. Mechanisms of strange trajectory of knuckle ball, forkball and Matsuzaka's longitudinal slider of baseball are treated by author's original research. Golf ball flight trajectory is also mentioned according to measurements of aerodynamic characteristics of highly rotating real golf ball by wind tunnel test and field test. The other interests of erratic motion for valley ball and sacker ball are focused in a final stage of this paper.

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