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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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- 학술저널
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- 발행연도
- 2005.4
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- 21 - 28 (8page)
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The force balance test is generally used as a method to evaluate dynamic responses and static design wind loads for tall buildings. Nevertheless, exact wind profiles can't be assessed with the force balance test. Also, the force balance test should be performed on the assumption that the 1st vibration mode governs the total dynamic behaviors. However, higher vibration mode contributions and proper wind load profiles should be considered in the analysis of slender structure behaviors.
Nowadays, several evaluation methods using pressure data have been suggested to overcome those problems in the force balance test. The GF(Gust Factor) method is usually used as a method to evaluate equivalent static wind loads for general structures. The GF method is performed on the assumption that the shape of the equivalent static wind load profile is typically similar to that of mean wind loads. However, the shape of fluctuating wind loads could be quite different with that of the mean wind loads in case of complex and slender structures. Therefore, enhanced methods such as LRC(Load Response Correlation), CS(Conditional Sampling) have been suggested, yet it seems still unclear to combine fluctuating parts of wind loads.
In this study, the MCS(Modified Conditional Sampling) method is suggested for the evaluation of equivalent static wind loads. The MCS is a method to derive effective static wind loads by combining wind pressures and inertia forces of a structure chosen at a maximum load effect. The maximum load effect is assessed with the dynamic transient analysis using pressure data acquired in wind tunnel tests. In this paper the problems of GF, LRC, and CS mehtod are described and then the concept and the procedure of MCS method is explained. After that, equivalent static wind loads are assessed for an example of a slender structure with those methods and the results are compared to validate the MCS method. Also, the effectiveness of the MCS method is evaluated by the comparison of static analysis results using the derived equivalent static load with transient analysis results.
Nowadays, several evaluation methods using pressure data have been suggested to overcome those problems in the force balance test. The GF(Gust Factor) method is usually used as a method to evaluate equivalent static wind loads for general structures. The GF method is performed on the assumption that the shape of the equivalent static wind load profile is typically similar to that of mean wind loads. However, the shape of fluctuating wind loads could be quite different with that of the mean wind loads in case of complex and slender structures. Therefore, enhanced methods such as LRC(Load Response Correlation), CS(Conditional Sampling) have been suggested, yet it seems still unclear to combine fluctuating parts of wind loads.
In this study, the MCS(Modified Conditional Sampling) method is suggested for the evaluation of equivalent static wind loads. The MCS is a method to derive effective static wind loads by combining wind pressures and inertia forces of a structure chosen at a maximum load effect. The maximum load effect is assessed with the dynamic transient analysis using pressure data acquired in wind tunnel tests. In this paper the problems of GF, LRC, and CS mehtod are described and then the concept and the procedure of MCS method is explained. After that, equivalent static wind loads are assessed for an example of a slender structure with those methods and the results are compared to validate the MCS method. Also, the effectiveness of the MCS method is evaluated by the comparison of static analysis results using the derived equivalent static load with transient analysis results.
목차
Abstract
1. 서론
2. 기존 평가법
3. Modified Conditional Sampling법(MCS법)
4. 풍동실험
5. 풍압데이터의 유효성 검증
6. 결과분석
7. 결론
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