TAILIEUCHUNG - Báo cáo khoa học " Towards Better Evaluation of Design Wind Speed of Vietnam "

The wind itself owns variations and indeterminists governed by global circulations, regional climates, and local topographies and so on. Customarily, extreme wind speeds are preferably defined in term of probability which is interested for engineering today. Thus, the well wind records, identified wind mechanisms, and suitable methods of extreme value analysis and so on, are always required to predict reliable design wind speeds that would be used for structural design. For the past three decades, there have been many valuable studies in developing basic design wind speed map. . | Towards Better Eva l uation of Design Wind Speed of Vietnam Le Truong Giang PhD Candidate WERC Tokyo Polytechnic University 1583 liyama Atsugi Kanagawa Japan Yukio Tamura Professor Director ditto Masahiro Matsui Associate Professor ditto 1. Introduction The wind itself owns variations and indeterminists governed by global circulations regional climates and local topographies and so on. Customarily extreme wind speeds are preferably defined in term of probability which is interested for engineering today. Thus the well wind records identified wind mechanisms and suitable methods of extreme value analysis and so on are always required to predict reliable design wind speeds that would be used for structural design. For the past three decades there have been many valuable studies in developing basic design wind speed map. These knowledge-bases give an opportunity to put forward an appropriate procedure for extreme wind study of Vietnam. Evidently it is better first to pay attention to what researchers did for making wind speed map then to check up on Vietnamese situations to discuss on what should be adopted. In several major wind loading codes explanation on the way to treat extreme winds are available except a detail procedure for making wind map. Commentary for wind load of AIJ-RLB 2004 published in 2006 1 generously offered a detail procedure for making wind speed map of Japan abbreviated by Japan s procedure . In Japan s procedure 5 steps were required including Step 1 Collecting data Records of wind speed and direction for all meteorological stations from 1961 to 2000 Step 2 Evaluating of terrain category in considering to historical variation Step 3 Reducing those data to common base meteorological standards Step 4 Analyzing extreme value probability for mixed wind climates with two sub-steps Step 4a Evaluating extreme wind probability distribution due to non-typhoon winds and Step 4b Evaluating extreme wind probability distribution due to typhoons Typhoon .

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