聚合物复合材料改性隔热混凝土和砖砌体墙板的面内性能试验

N. Ismail, T. El-Maaddawy, A. Najmal, N. Khattak
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引用次数: 5

摘要

在引入现代抗震措施之前建造的砖石填充钢筋混凝土框架建筑,在最近的中重度地震中,砖石填充墙内部和周围都受到了破坏。纤维增强胶凝基质(FRCM)是几种可用于限制地震引起的填充墙损伤的改造选择之一。本文进行了一项实验计划,以实验研究FRCM作为加固老式(即建于1880年至1930年之间)无增强砖砌体(URM)和绝缘混凝土砌体(IMU)填充墙的有效性。共有16个砌体组合在平面内对角荷载下进行了测试,其中8个是复制老式URM建造的,其余的是使用现代IMU建造的。IMU具有优异的保温性能,是湿热地区首选的砌体类型。不同的聚合物织物(即碳、玻璃和玄武岩)被应用于测试墙的两面,两个重复的测试墙接受相同的FRCM强化细节。每个砌体类型的一个试验墙进行了测试,作为对照试件进行比较。每种砌体类型的一面墙均采用两层玄武岩FRCM。研究的方面包括应力-应变行为,刚度和延性。由于单层FRCM的应用而观察到的抗剪强度增加在复古URM中为422-778%,在现代IMU中为307-415%。FRCM还大大提高了砌体组合体的延性能力。
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Experimental in-plane performance of insulated concrete and brick masonry wall panels retrofitted using polymer composites
Masonry infilled reinforced concrete frame buildings built prior to the introduction of modern seismic provisions have been observed to undergo damage in and around the masonry infill walls during most recent moderate to severe earthquakes. Fibre reinforced cementitious matrix (FRCM) is one of several retrofitting options available to limit such earthquake induced damage to infill walls. An experimental program was undertaken herein to experimentally investigate the effectiveness of FRCM as a strengthening solution for vintage (i.e. built between 1880 and 1930) un-reinforced brick masonry (URM) and insulated concrete masonry (IMU) infill walls. A total of 16 masonry assemblages were tested under in-plane diagonal load, of these 8 were constructed replicating vintage URM whereas the remainder were constructed using modern IMU. IMU is a preferred masonry type in hot and humid regions owing to its superior insulting capability. Different polymer fabrics (i.e., carbon, glass and basalt) were applied over both faces of test walls, with two replicate test walls receiving the same FRCM strengthening details. One test wall of each masonry type was tested as-built to serve as a control specimen for comparison. One wall of each masonry type received two layers of basalt FRCM. The investigated aspects included stress-strain behaviour, stiffness, and ductility. Shear strength increment observed due to single layer of FRCM application was 422-778% for vintage URM and 307-415% for modern IMU. FRCM also substantially increased the ductility capacity of the masonry assemblages.
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来源期刊
CiteScore
2.50
自引率
17.60%
发文量
14
期刊最新文献
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