理想背骨曲線(Backbone Curve)係為鋼筋混土柱構件塑性行為發展依據，在此所稱理想背骨曲線係指鋼筋混凝土柱構件歷經撓曲降伏後，發生塑性發展至核心混凝土碎裂，甚至鋼筋發生挫曲最後達崩壞狀態的迴圈反應。對前述行為的定義，係為數據模型執行非線性分析(側推分析)前的必要設定，其目的係為得到側推分析後的建物容量譜，以為建物耐震容量評估的依據。隨科技的進展，為執行上述程序，坊間常見套裝軟體係有ETABS(亦為本篇論文研究所使用的套裝軟體)，於此套裝軟體，對於前揭背骨曲線的定義，係參照FEMA356將其行為簡化以A~E點模擬，並配合FEMA356表6-7提供默認塑鉸參數a~c，以模擬鋼筋混凝土柱構件的塑性發展。然對於上述定義雖屬美國法規建議，仍有相當聲浪質疑其適用性，另考量鋼筋混凝土柱構件於實際建物中的塑性行為判斷困難，故有眾多學者投注於此領域專研。隨相當論文研究的回饋，目前國內係有TEASPA輔助程式幫助計算塑鉸參數(a~c)，其最新版次3.1係於民國108年1月經內政部營建署審認。
TEASPA3.1中為模擬高樓建築的軸力變化，係建議設定11組軸力變化，另為模擬建物的不規則性質，係透過程式默認軸力雙軸彎矩塑鉸(PM_2 M_3)設置，配合輔助程式將其拆為2個軸力單軸彎矩塑鉸(PM_2及PM_3)替之。然考慮SERCB曾於使用手冊提及，程式雖供使用者設置多重塑鉸於同一斷面，卻有主控及捨棄機制。故於本篇論文主要係提供軸力雙軸彎矩塑鉸(PM_2 M_3)計算方式建議，並驗證塑鉸主控與捨棄機制存在與否

In order to access the drift capacity models of buildings, defining idealized backbone models in members is a key procedure before executing a nonlinear analysis (Pushover analysis). With the progression in technology, ETABS is one of the productive finite element programs nowadays which is also the program used to make the research in this thesis. Although there are multiple types of default hinge properties in ETABS based on the FEMA356 tables for modeling nonlinear behaviors, there are still issues needed to be discussed. With accumulation in researches, suggested empirical models based on PEER database have been established; moreover, a method for calculating plastic hinge parameters for reinforced concrete column members has been suggested. Based on the calculating method, an assistant program called TEASPA was updated and even authorized by Construction and Planning Agency, Ministry of the Interior in Taiwan, in January, 2019.
Considering the concept of that plastic hinges controlling and disserting system might exist in ETABS, this thesis mainly aims to suggest a method for calculating the (PMM interaction) plastic hinges factors; besides, to verify whether disserting system discussed above actually exists or not.

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