THE DYNAMIC BEHAVIORS OF LARGE SPAN HEMI-SPHERICAL DOMES UNDER WIND LOADS

• Main Authors: Chi-Ching Wu, 吳旗清
• Other Authors: 鄭啟明
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/72671653937834155939

博士 === 淡江大學 === 土木工程學系博士班 === 102 === In engineering practice, the wind resistant design of long span dome is based on either building wind code or wind tunnel test. Wind tunnel test is the most accurate procedure among all; but the process is also expensive and time-consuming. Therefore, it is meaningful to have a less costly procedure that can produce a reasonably accurate wind loads for the wind resistant design of long span dome, at least in the preliminary planning and design stage. In this article, firstly, nonlinear regression models of wind pressure spectra were constructed based upon wind tunnel data. Then auto-regressive model (AR) was used to generate the surface wind pressure time histories to be used as in the subsequent time domain dynamic analysis. In this article, finite element model of three different structural systems were constructed for the hemi-spherical dome. Then, wind tunnel produced surface pressure time histories were used to perform time domain dynamic analysis on these dome structures. The comparative studies indicate that the geometric non-linearity plays an important factor in the hemi-spherical dome structural behavior under wind loads; ignoring it would cause noticeable underestimation. Furthermore, the equivalent static design wind loads in the existing building wind codes tend to be significantly un-conservative.