This study investigates the effects of prescribed damage on the walls of masonry buildings by experimental and numerical methods. Ambient vibration survey method was applied to an existing, two-story, unreinforced masonry building to determine its dynamic characteristics, such as mode shapes and natural frequencies. Then, the walls on two exterior sides of the building were demolished, and dynamic testing was repeated for the damaged building. As the next step, the amount of damage on the building was increased by more impacts, and the dynamic characteristics of the heavily damaged building were identified. The results obtained from the undamaged, damaged and heavily damaged building were compared, and the damage effect on the natural frequencies of the building was noted. Besides, finite element analyses of the undamaged, damaged and heavily damaged buildings were performed. It was found that, the numerical models, constructed with code-based material properties, do not sufficiently represent the dynamic behavior of masonry buildings. Secondly, as the result of the sustained damage, while the experimental and the numerical modal analyses revealed the decrease in the dominant frequencies of the building, the difference between them increases with the severity of the damage. With the framework presented in this study, the behavior of masonry buildings can better be determined and used for analysis purposes.

中文翻译：

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基于动态分析的砌体建筑渐进式损伤分析

本研究通过实验和数值方法研究了规定损伤对砌体建筑物墙壁的影响。环境振动测量方法应用于现有的两层无钢筋砌体建筑，以确定其动态特性，如振型和固有频率。随后，拆除了建筑物外侧两侧的墙体，并对受损建筑物进行了动态测试。下一步，更多的冲击增加了建筑物的损坏量，并确定了严重受损建筑物的动态特性。比较了从未损坏、损坏和严重损坏的建筑物获得的结果，并注意到损坏对建筑物固有频率的影响。此外，未损坏的有限元分析，对受损和严重受损的建筑物进行了表演。结果发现，使用基于代码的材料属性构建的数值模型并不能充分代表砌体建筑的动态行为。其次，作为持续损坏的结果，虽然实验和数值模态分析显示建筑物的主导频率下降，但它们之间的差异随着损坏的严重程度而增加。借助本研究中提出的框架，可以更好地确定砌体建筑的行为并将其用于分析目的。虽然实验和数值模态分析显示建筑物的主要频率下降，但它们之间的差异随着损坏的严重程度而增加。借助本研究中提出的框架，可以更好地确定砌体建筑的行为并将其用于分析目的。虽然实验和数值模态分析显示建筑物的主要频率下降，但它们之间的差异随着损坏的严重程度而增加。借助本研究中提出的框架，可以更好地确定砌体建筑的行为并将其用于分析目的。