偏心斜撐的平面構架簡化模式非線性分析

Abstract

在強柱弱樑的設計理念下，可以假設同一層樓柱子有相似的變形形狀。結 構物中的樑，則可以假設其反曲點在中點。而偏心斜撐則假設其主要提供 側向勁度。樓版假設為剛性樓版，即同一樓層有相同的側向變位.如此,可 以把同一樓層之自由度濃縮為2個。在偏心斜撐方面，則假設偏心斜撐只 有一個自由度,即X方向的自由度．所得結果與Drain-tabs比較，偏心斜撐 部份則用相同勁度的剪力牆代替,來驗證此模式的合理性。此分析模式可 以大大的減少自由度的數目。在時間方面亦減少相當多.可以用作實際分 析前的先行檢查。 If a structure has same span length,in the design philosophy of strong-column-weak-beam ,we can suppose that columns have similar deformation shape.We also can suppose that the reflection point is the middle point of beam.We suppose the floor is rigid ,then the same floor has the same deformation.So we can condense the degrees of freedom of the same floor to two degrees of freedom and eccentr- ically brace has only one degree of freedom-X way. We compare the results with Drain-tabs program and the part of eccentrically brace is replaced by the same stiffness of shear panel. This model can reduce lots of degrees of freedom and lots of time and can check the structure before actual analyis.