Dynamic characteristics of long span roof structure under wind loading

• Main Authors: Shih-Pei Hung, 洪詩姵
• Other Authors: Yuh-Yi Lin
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/88948104209612537350

碩士 === 淡江大學 === 土木工程學系碩士班 === 97 === Due to the increase of span length and the reduction of total structural mass, the structural behavior of long span roof structure become more complicated. The sensitivity to wind for this type of structure is also increased. Because Taiwan is a typhoon prone area, the importance of wind resistant design of the type of structures can not be ignored. The main purpose of this thesis is to develop a method combined POD and Ritz vectors for improving the efficiency of calculations in the dynamic analysis of the long span roof structures under wind excitations. The numerical results obtained from this approach are compared with those obtained from direct integration and traditional modal analysis. Two examples are used to demonstrate the validity and the efficiency of this method. It can be inspected from the results that using a few POD modes and Ritz vectors can obtain satisfactory results efficiently. It is shown that this approach can save a lot of calculation time and still maintain the validity in both two examples. A parametric analysis including number of POD modes and number of Ritz vectors adopted in the analysis is also performed.