鋼筋混凝土構架填充低台度磚牆之試驗研究

Experimental Study of Reinforced Concrete Frame Filled with Low Masonry Window Spandrel

張順益(Shuenn-Yih Chang) ； 吳秉祈(Ping-Chi Wu) ； 巫垂晃(Tsui-Huang Wu)

《結構工程》 33卷3期 (2018/09) Pp. 87-110

https://doi.org/10.6849/SE.201809_33(3).0005

摘要

國內老舊校舍建築物在受到地震侵襲時，常因鋼筋混凝土構架內填充台度磚牆而發生短柱破壞。其中台度磚牆所提供的側向剪力強度，即是評估是否發生短柱破壞的重要因子，而台度磚牆的側向抗剪強度可能因其高寬比以及臨界破壞角的不同而有所差異。由於現行估算方法並未考慮台度磚牆高寬比的影響，因此並無法真實反應台度磚牆的側向剪力強度。本文特別針對低台度磚牆的側向抗剪強度進行三座試體的試驗研究，其中一座為空構架試體以及兩座填充不同高度之低台度磚牆構架試體，用來做為推估鋼筋混凝土構架內低台度磚牆側向剪力強度的重要依據。此三座試體除了進行反覆載重試驗之外，也利用側推模擬分析探討其耐震行為，將分析結果與試驗結果進行比較以推估低台度磚牆的側向剪力強度。從試驗結果可以得知低台度磚牆的高寬比為其側向剪力強度的重要因子之一，因此在推估低台度磚牆的側向剪力強度時，若能將高寬比這項因子適度的反應在計算的公式中，將可以更真實的預測台度磚牆的側向剪力強度。本研究已據此原則研擬出鋼筋混凝土構架填充低台度磚牆的剪力強度計算公式。

關鍵字

鋼筋混凝土 ； 低台度磚牆 ； 反覆載重試驗 ； 側推分析 ； 剪力強度

並列摘要

In Taiwan area, structural damages caused by short column effect are very common in school buildings. The short column failure is closely related to the shear strength of the masonry window spandrel infilled within a reinforced concrete frame. The shear strength of a masonry window spandrel might be highly affected by its height-width ratio. However, this factor is not considered in the current evaluating formula and thus this formula seems unable to faithfully predict the shear strength. In fact, a formula for estimating the shear strength of a masonry window spandrel has been proposed. Because the height-width ratio of the masonry window spandrel was not considered in the formula its application is limited or might be inappropriate. To improve this formula, three reinforced concrete frames were designed and fabricated for the cyclic loading tests for predicting the shear strength of a low masonry window spandrel within a reinforced concrete frame. One is a pure frame and the other two frames were infilled with different height of the masonry window spandrels. After conducting the cyclic loading tests of the three frames, the pushover analysis of each frame was also performed. Hence, after comparing the analytical result with the experimental results, the shear strength of the masonry window spandrel can be estimated. In this work, the height-weight ratio is chosen as an important factor for the newly proposed formula to estimate the shear strength of a low masonry window spandrel within a reinforced concrete frame. As a result, an improved formula for predicting the shear strength of the low masonry window spandrel within a reinforced concrete frame is proposed in this work.

並列關鍵字

Reinforced Concrete Building ； Low Masonry Window Spandrel ； Seismic Evaluation ； Pushover Analysis