火烧砖石拱顶的模态分析

Fire Pub Date : 2024-06-08 DOI:10.3390/fire7060194
Armando La Scala, Pierpaolo Loprieno, S. Ivorra, Dora Foti, Massimo La Scala
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引用次数: 0

摘要

本研究分析了砖拱顶的热机械行为以及火灾对其动态特性的影响。根据对一个净跨度为 161 厘米、净升高 46.5 厘米的真实桶形拱顶的实验测试结果,建立了一个精确的数值模型,用于模拟砖混结构在热机械应力下的行为。通过比较拱顶各点的基石位移和温度的变化,我们可以肯定所采用的微观建模方法具有良好的准确性和可行的计算能力。最后,本研究从数值角度展示了如何预测火灾等极端情况下的结构特征频率变化。这对于制定有效的干预和预防策略至关重要,有助于保护我们宝贵的文化和历史资源。
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Modal Analysis of a Fire-Damaged Masonry Vault
This study analyzes the thermo-mechanical behavior of a brick vault and the effect of a fire on its dynamic characteristics. Based on the results of an experimental test of a real barrel vault with a net span of 161 cm and a net rise of 46.5 cm, an accurate numerical model to simulate the behavior of the brick-and-mortar structure under thermo-mechanical stresses has been implemented. The comparison of the evolution of the displacement in the keystone and the temperatures at various points of the vault allows us to affirm that the adopted micro-modeling approach presents a good accuracy and a feasible computational effort. Finally, this study shows, from a numerical point of view, how the variation in the structure’s eigenfrequencies can be predicted for extreme situations, such as fire damage. This aspect can be critical to develop effective intervention and prevention strategies, which can be useful for the preservation of our valuable cultural and historic resources.
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