台灣早期低矮鋼筋混凝土建築多以加強磚造的方式作為磚牆構法，經過歷年多次地震災害均可見台灣早期低矮鋼筋混凝土建築有側向力強度與韌性不足的問題。為了提升早期加強磚造建築之抗震強度，有許多補強工法已被開發與使用。噴漿工法是常見的牆面施工方法，將拌合好的水泥砂漿利用泵送系統經由管線運送到施作地點，以空壓機所提供的氣壓將砂漿均勻噴塗施作面上，因為利用機械取代部分人力並且省略塗抹鏝料的時間，可達到減少人工與縮短工期的效果。超高性能混凝土(Ultra-High Performance Concrete，簡稱 UHPC)擁有優異的力學強度與韌性，可做為有效的抗震補強材料，使得結構物的強度與韌性獲得顯著的提升。本研究將 UHPC 作為補強材料以噴漿工法噴塗於磚牆表面，並進行磚牆對角剪力試驗，比較磚牆於補強後之受力行為。試驗結果顯示利用 UHPC 噴漿補強之磚牆強度與韌性皆有明顯提升。

The existing low rise reinforced concrete buildings in Taiwan mostly belong to confined masonry buildings. After many earthquake disasters in the past years, it can be observed that the many low-rise reinforced concrete buildings in Taiwan had insufficient lateral strength and toughness. In order to enhance the seismic strength of these low rise reinforced concrete buildings, many retrofitting methods have been developed and adopted. The shotcrete is a common wall construction method. The concrete is transported to the construction site through pipelines by the pumping system. Then, the concrete is evenly sprayed on the surface of the construction site with the air pressure provided by the air compressor. Replacing part of the manpower with the machines and saving the time to apply the trowel can achieve the effect of reducing labor cost and shortening the construction period. Ultra-high performance concrete (UHPC) has excellent mechanical strength and toughness. UHPC can be used as an effective seismic retrofitting material, which significantly improves the strength and toughness of structures. In this study, UHPC used as a mainly retrofitting material was sprayed on the surface of the masonry wallettes with the shotcrete system. The diagonal shear tests of the wallettes were performed to compare the retrofitting effectiveness of the different retrofitting methods. The test result shows that the strength and toughness of masonry wallattes retrofitted by UHPC shotcrete are significantly improved.

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