Historic masonry buildings are highly vulnerable to anthropic actions and environmental factors due to their low tensile strength, and bounded compressive strength. Over the years, numerous studies and experimental campaigns have been conducted to characterise the buildings’ response to external actions and identify solutions for their conservation against multiple factors, such as climatic changes, material ageing and earthquakes. However, the historic masonry structures’ response in case of fire and their safety assessment in post-fire conditions, still needs to be thoroughly investigated both from an experimental and numerical point of view. This paper generalises the constitutive equation of (or no-tension) materials under non-isothermal conditions to the case in which the masonry has weak tensile strength and bounded compressive strength, even temperature dependent. The generalised constitutive equation is then implemented in NOSA-ITACA and the explicit solution to the equilibrium problem of a masonry circular ring in plane strain condition is calculated and compared with the numerical solution. Subsequently, the code is used to perform an uncoupled thermo-mechanical analysis of a real case study: a masonry barrel vault tested in fire conditions. The agreement between the experimental and numerical results paves the way for further study and research.

中文翻译：

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火灾条件下砌体结构的热机械分析

历史砖石建筑由于其抗拉强度低且抗压强度有限，极易受到人类活动和环境因素的影响。多年来，人们进行了大量的研究和实验活动来描述建筑物对外部作用的反应，并确定针对气候变化、材料老化和地震等多种因素的保护解决方案。然而，历史砖石结构在火灾中的反应以及火灾后的安全评估仍然需要从实验和数值的角度进行彻底的研究。本文将非等温条件下（或无张力）材料的本构方程推广到砌体具有弱抗拉强度和有界抗压强度，甚至与温度相关的情况。然后在NOSA-ITACA中实现广义本构方程，计算平面应变条件下砌体圆环平衡问题的显式解，并与数值解进行比较。随后，该代码用于对真实案例研究进行非耦合热机械分析：在火灾条件下测试的砖石桶形拱顶。实验与数值结果之间的一致性为进一步的研究铺平了道路。