本論文主要探討風力機塔在地震力下的易損性曲線，並討論靜力分析與動力分析的易損性曲線結果比較。研究案例是以78M風力機塔作為分析模型，利用動力多帶分析方法得到易損性曲線，其中在定義損害程度部分將局部降伏區域作為第四個損害程度。 由結果顯示，多帶分析得到的易損性曲線相較於靜力側推分析往左偏移一些，代表動力在比靜力小的強度值下就會比較容易出現損壞狀況，在第四條損害程度，多帶分析是用局部降伏區域來呈現而靜力分析是用挫曲來表示，由易損性曲線結果顯示，分別畫出25%和50%的區域降伏與挫曲進行比較，發現當降伏區域越大則會越接近挫曲，但由於網格的設置，降伏區域分析結果最高為50%。最後定義出四個損害程度: (1)1.25%頂點位移 (2)容許應力250MPa (3)到達350MPa降伏應力 (4)區域降伏面積到達50%。 由靜力與動力分析結果比較得知易損性曲線結果大致相同，在進行分析時可以互相檢查是否有差異過大的情形。 ;This paper is mainly talked about the fragility curve of the wind turbine under the earthquake force and discuss the fragility curves difference between the static and the dynamic analysis. This research uses 78M height wind turbine to analyze, and then define the fourth damage state. In the result, the fragility curve from multiple stripes analysis moves slightly to the left vs static pushover analysis which means that dynamic analysis appear to be easier to reach the damage condition than static analysis. In the case of damage state, the local yield area is used to define the fourth damage state in multiple stripes analysis. To compare with static pushover analysis used buckle to define the last damage state, this paper use 25% and 50% local yield area to get two fragility curves, and then indicates that the more area is yield, the closer to fragility curve defined the stage of buckling. Finally, this paper defines four damage states: (1)1.25% drift of top floor (2) reach allowable stress 250MPa. (3) reach yield stess350MPa (4) yield area reach 50%. In the result, it knows that fragility curves made from dynamic analysis is similar to static analysis and these curves can be compared with each other as a validation.
