有鑒於 Hakuto 所提出之接頭剪力衰減模式，僅是由實驗數據歸納而得，缺乏相關的理論背景。因此本研究主要是將梁柱接頭模擬成平版抗剪的形式，並以桁架軟化模式做為理論依據，進行有關梁柱接頭在載重歷時中，所產生的剪力強度衰減曲線之評估，以確切了解到接頭在損壞後的殘餘抗剪強度，作為現行結構耐震評估的重要依據。 由分析討論的結果得知，利用桁架軟化模式分析接頭的極限抗剪強度時，由於接頭鋼筋不屬於均勻分佈，因此鋼筋比必須作適當的折減，如此可預測出接頭的極限抗剪強度，而在剪力衰減的評估方面，主要是取決於混凝土的軟化模式。目前本研究結果，以 Belarbi 和 Hsu 在1995年所提出的軟化係數，並配合 Thorenfeldt 曲線形式，較能描述接頭軟化行為，但仍有待更多的實驗進行驗證。 This thesis comes from an idea of Hakuto’s shear degradation curve provided in 1990’s, proposing a rationally theoretical model verified basing on experimental data. The purpose of this study is to simulate the beam-column joint using a panel truss model via present concrete softened theories to find out the degradation curve of joint. Meanwhile, the analytical results of shear. Degradation on curves of beam-column joints can offer a tool for the seismic assessment of building structures. Results show, in order to predict the ultimate joint stress, the ratio of joint reinforcement have to properly reduce, restricting to the assumption of distributed joint reinforcement of the panel analysis. To obtain joint shear degradation curve, previous softened concrete models are adopted. According to data fitting, 1995’s Belarbi and Hsu softened model with Thorefeldt can simulate the behavior of beam-column joint well. However, it needs more experimental verification.
