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首页> 外文期刊>Journal of Civil Engineering and Science >Temporary Strengthening Technique of Marble Columns with Steel Wires and Wood Spars
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Temporary Strengthening Technique of Marble Columns with Steel Wires and Wood Spars

机译：钢丝和木杆大理石柱的临时加固技术

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Granite, marble and heavy stone columns have been used in the architects from all the ages to answer to both aesthetical and structural requirements in ancient churches and historical buildings. Such materials offer great visual impact and have mechanical properties that allow their use in construction and to obtain bright and slender structures. Marble is a very high strength but brittle material. It often occur that marble or granite columns of historical building are cracked along their height due to external actions and the risk of buckling occurs. Because this kind of failure is sudden and very brittle in stone and rocks, an immediate strengthening of the columns is needed. Among e temporary strengthening technique consisting in steel collaring with wood spars and steel wires is of interest. This technique was widely utilised by Firemen and Civil protection during the earthquakes occurred in Italy in the last years, but very few experimental and theoretical researches are available on this topic. In this paper the interest was on this technique and an experimental program based on compressive tests on monolithic and cracked marble columns with circular cross-section reinforced externally with wood spars and steel wires was carried out. A simple model based on the determination of the critical load of an elastic beam on elastic springs is able to take into account the steel collaring. The results obtained highlight that from a theoretical point of view, the presence of steel collaring in cracked column increases the critical load, ensuring monolithic behaviour, while from the practical point of the view the technique is very cheap and easy to apply in temporary strengthening of cracked columns.
机译：各个年龄段的建筑师都使用花岗岩，大理石和重石柱来满足古代教堂和历史建筑的美学和结构要求。这种材料具有很大的视觉冲击力，并具有机械性能，可用于建筑并获得明亮细长的结构。大理石是一种强度很高但易碎的材料。由于外部作用，历史建筑的大理石或花岗岩圆柱经常会沿其高度破裂，并发生屈曲的风险。由于这种破坏是突然发生的，在石头和岩石中非常脆，因此需要立即加固圆柱。在包括用木杆和钢丝制成的钢颈圈的临时加固技术中，是令人感兴趣的。近年来，在意大利发生地震时，消防员和民防人员已广泛使用此技术，但有关此主题的实验和理论研究很少。在本文中，人们对该技术感兴趣，并且基于压缩测试，对整体和开裂的大理石柱进行了试验，该柱具有圆形截面，外部用木梁和钢丝加固。基于确定弹性弹簧上的弹性梁的临界载荷的简单模型可以考虑钢套环。所获得的结果突出表明，从理论的角度来看，裂化柱中钢套环的存在增加了临界载荷，从而确保了整体性能，而从实际的角度来看，该技术非常便宜，并且易于临时加固混凝土。破裂的列。

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