| Summary: | 碩士 === 淡江大學 === 土木工程學系碩士班 === 93 === Domes with large span and grand standing arched roofs are common structural forms in the modern architecture practice to meet both the functional requirement and the aesthetic consideration. This type of structure system tends to be light weighted and relatively flexible, therefore, more wind sensitive than the other large structural systems. The simplified design wind load in the current building wind code is suitable only for small to medium size storage dome. A more sophisticated design wind load procedure is needed for large span dome or arched roof system.
In order to investigate the designed wind loads of arched roofs, this project used a real arched roof system in Kaoshiung as the target structure. A properly scaled pressure model was built and the wind pressure of the roof system was measured in a turbulent boundary layer. The Proper Orthogonal Decomposition Method (POD) was applied to get the insight of the wind load on the roof system. The Load-Response-Correlation Procedure (LRC) was used to evaluate the proper design wind load. The POD results indicate that the wind pressure distribution on the roof’s short axis (in the direction of wind) exhibits characteristics of incident turbulence, separation and reattachment as expected. However, the wind pressure distribution on the roof’s long axis (lateral direction to the wind) does not show clear physical significance. The LRC analysis suggests that the design wind load based on the strength of all members would be too conservative. Using a few selected key structural members as the basis of the LRC procedure would yield a more reasonable design wind load.
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