石灰砂漿砌磚牆體面內加載實驗及水平耐力估算

Experimental Investigation and Strength Evaluation of URM Wall with Slime Mortar under In-Plane Loading

歷史建築物磚砌牆體，大多為石灰砂漿或含少量水泥之石灰砂漿，在估算此類牆體水平面內極限耐力時，若採根據一般水泥砂漿牆體所發展之方式，會有過度高估及破壞路徑不合理之現象。為探討此問題，本文製作九道不同灰漿配比之1B磚砌試體，施以對角加載，紀錄其極限加載及對應之破壞路徑。依據實驗觀察，本文進一步提出低灰漿強度磚砌牆體水平耐力之估算方式，估算過程其破壞路徑之研判，綜合磚材強度及砌縫強度。估算結果較其他方式更接近實驗值。對於無局部破壞之試體，本文估算值與實驗值平均差距低於5%。

For the brick wall of historic masonry building, slime mortar or low percentage cement mortar is often used. Due to its low-strength characteristics, adopting the method developed for wall constructed with general cement mortar to evaluate the resistant capacity under lateral loading, the wall strength will be overestimated and the corresponding failure path may be unreasonable. In this study, nine brick wall specimens were manufactured and tested under diagonal compressive load. The slime mortar is adding with various cement ratios. According to the failure path observed from the experiment, a procedure for evaluating the ultimate strength of URM walls is developed in this study. The relative strength between brick and mortar and the characteristics of low strength of mortar has been considered in the development of potential failure path. The comparison of evaluation and experiment shows the average differential value of ultimate wall strength is lower than 5%. Comparing to the method for cement mortar, this method will obtain more reasonable wall strength evaluation for brick wall using low strength mortar.