近年來常見中高樓層建築物受地震力作用而毀損、傾倒。為了增加建築結構之消能及抗剪能力，耐震結構中會配置鋼筋混凝土剪力牆以提供良好的剪力強度與結構勁度。有許多研究指出RC剪力牆面內方向及面外方向的相互耦合作用，明顯減弱了結構的耐震能力。RC剪力牆對於抵抗雙軸方向位移時，破壞情形相較抵抗單軸方向位移更加嚴重。此外根據研究報告之實驗結果觀察發現：非矩形斷面RC剪力牆受側推力作用下，翼牆與腹牆之接頭處會有明顯的剪力遲滯效應。本研究利用有限元素LS-DYNA軟體模擬RC矩形斷面結構牆與T形斷面結構牆雙軸互制之行為。藉由變化翼牆寬度、翼牆厚度、高寬比、面外位移比及軸壓比等參數，探討矩形結構牆與T形結構牆面內方向的耐震能力。並且量化翼牆內剪力遲滯效應的影響，探討建議有效翼牆寬度。

Nowadays one of the techniques to increase the lateral load capacity and structural stiffness of high-rise buildings is by using Reinforced concrete (RC) structural walls. According to former researchers, the lateral load capacity of the structural walls is influenced by the interaction between its weak and strong axis. In this study, it was done a pushover analysis to comprehend the behavior of T-shaped RC walls under biaxial loading.
LS-DYNA was used to simulate different scenarios in which the model had out-of-plane deflections on the weak axis with drift ratios of 1%, 2%, 4%. Then a monotonic load of 5% was included on the strong axis. It was possible to realize a comparison between the response of uniaxial and biaxial loading.
The results indicate that a major factor on the behavior of T-shaped wall subjected to biaxial loading was the tension in the flange. It was observed that the increase in the axial load significantly decreased the lateral load capacity. On the other hand, an increase in the width of the flange only caused minor decrease in lateral load capacity. The shear lag effect ratio was obtained in the case when the flange of the T-shaped walls was under tension and using statics method to obtain the Effective flange width.

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