| Project/Area Number |
13450230
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Building structures/materials
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| Research Institution | TOKYO POLYTECHNIC UNIVERSITY |
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Principal Investigator |
TAMURA Yukio Tokyo Polytechnic University, Professor, 工学部, 教授 (70163699)
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| Co-Investigator(Kenkyū-buntansha) |
OHTAKE Kazuo Takenaka Corporation, Senior Researcher, 技術研究所, 研究員
YOSHIDA Akihito Tokyo Polytechnic University, Research Assistant, 工学部, 助手 (90329219)
MATSUI Masahiro Tokyo Polytechnic University, Associate Professor, 工学部, 助教授 (60350576)
菅沼 信也 東京工芸大学, 工学部, 講師 (80267533)
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| Project Period (FY) |
2001 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥8,500,000 (Direct Cost: ¥8,500,000)
Fiscal Year 2002: ¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 2001: ¥4,500,000 (Direct Cost: ¥4,500,000)
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| Keywords | Typhoon Simulation / Meteorological Station / Directional Wind / Return Period / Terrain Roughness / Wind Speed Map / Modified Jensen Franck Method / Friction Free Wind / 風向係数 / 設計風速 / ドップラソーダ / 気象観測 / 日最大風速 / 修正Jensen-Franck法 / 数値解析 |
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| Research Abstract |
A Database for typhoons was constructed, and used to evaluate important parameters such as annual occurrence rate, central pressure depth, translation speed and radius of maximum wind. An improved simulation method for typhoon was also proposed. For the simulation method, there are two keys to success. One is statistical representation of typhoon pressure field parameters, and the other is accuracy in evaluating surface wind. The typhoon simulation method proposed was improved on these two points. This research proposed the so-called POD-based pressure model and hybrid use of observed records and calculated values. Directional wind speed probabilities were evaluated using an improved method for typhoon winds and a statistical method for non-typhoon winds. Wind load effects on tall buildings were calculated on the basis of directional wind speed probabilities. Non-typhoon winds were evaluated from observed records. In order to ensure independence, peaks more than 2 days apart were sampled on the basis of the modified Jensen and Frank method. These statistical analyses were conducted taking the surface roughness of the ground into account. For evaluating the surface roughness of ground, full-scale observations were conducted using the doppler sodas, wind tunnel experiments and numerical simulations. Considering the effects of both typhoon and non-typhoon winds, the exceeding probabilities of directional wind speeds were calculated. These probabilities were used to estimate the equivalent wind speed and directional wind speed factors of 100-year-return-period wind loads were given.
Consequently, considering the above studies, procedures for the calculation of directional wind speeds were proposed as well as wind speed maps for Japanese areas.
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