在台灣，過去有許多房屋採用RC構架內填磚牆構造方式興建，直到至今仍有許多人在居住、使用著。然而現有耐震評估方法對於這類的建築物往往只以內填磚牆面內抗震能力為依據，卻忽略了磚牆有可能在發揮面內強度之前就先於面外方向發生崩塌，且在許多大地震後的災損報告發現，不少建築物的磚牆都發生面外倒塌現象，造成居民生命財產的損失。相較於國外，國內鮮少有探討內填磚牆面外受震行為的相關研究。本文透過現地試驗實地觀察內填磚牆面外受力下之變形行為與構架間的互制關係，並建立內填磚牆面外受震的分析模型，推導出磚牆的開裂與極限強度與變位公式，期望能提供含磚牆之RC建築物耐震評估之參考。

經由兩現地試驗的觀察發現，內填磚牆在受面外水平集中載重下，會發生斷面受撓的情形，分別於正面底部與背面牆頂的拉力側發生開裂，形成主要裂縫，而在相對應的壓力側則有粉刷層受壓脫落的現象。且從位移計的數據資料顯示，磚牆面外變位隨牆高成線性關係。即磚牆在試驗過程中，在牆頂與牆底受撓開裂後，彷彿形成上下鉸接之二力桿，中間磚牆呈現剛體旋轉的現象。
本文分析模型係利用磚牆基本材料性質與結構行為推導出磚牆之開裂強度與變位公式，並進而利用內填磚牆在梁頂受一集中水平載重下所產生的壓桿理論，推導出計算內填磚牆面外極限強度與變位公式，發現磚牆之高厚比與磚墩之極限抗壓強度將影響內填磚牆的面外極限強度，此外利用兩開裂與極限強度公式亦能繪製出磚牆面外理論P-Δ曲線。經與現地試驗結果比較，顯示經由公式所計算之理論值雖略偏保守，但相較於其他文獻之分析模型更接近試驗值，因此證實本文所提之分析模型應屬合理可用。

In Taiwan, many people live in RC buildings that were constructed with un-reinfroced infilled masonry walls in RC frames. The existing seismic assessment for such structures usually emphasizes only on in-plane capacity of the infilled walls. However, the damage reports for earthquakes tell that sometimes the infilled masonry walls collapse at out-of-plane direction before they can contribute in-plane capacity. In this thesis, failing behavior of infilled masonry walls and interaction between the walls and RC boundary frames when they were subjected to out-of-plane loading were investigated from results of in-site tests. Analytical models were developed for estimating out-of-plane cracking and ultimate strength and displacement of the infilled masonry walls.

From 2 in-site tests, it is found that when the infilled masonry walls were subjected to out-of-plane concentrated loading, the top and bottom of walls bended and cracks happened at the tensile side. Out-of-plane displacement measured show that after the cracking happened, region between top and bottom cracks remained rigid, therefore the walls behave like 2-force members with hinges at both ends.
The analytical model assumes that infilled masonry walls are subjected to only concentrated loading. The cracking strength and displacement can be calculated simply by material and geometric properties, while the ultimate strength and displacement are developed by strut model. The ratio of height to thickness and compressive strength of brick piers are found to be main factors of the out-of-plane ultimate strength. Analytical P-Δ curves of infilled masonry walls are compared with the experimental ones. Analytical model presented in this thesis shows conservative but better prediction than other analytical models. It shows that the analytical model presented in this thesis is reasonable and applicable.

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