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Shaking Table Experimental Study on Diagnosis of Damage and its Evaluation in Steel Structure

机译：钢结构损伤诊断的振动台实验研究与评价

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摘要

The methods of diagnosis of damage through measuring the changes in dynamic structural properties have been intensively studied for many years now. On the contrary to mechanical or aeronautical engineering, however, the practical application of the methods in the case of civil engineering structures meets a number of difficulties indicating the need for further research. This concerns in particular the need for the shaking table investigations since the results of such tests are very limited. Therefore, the aim of the present paper is to show the results of the shaking table study conduced on a model of two-storey steel frame building. The 1.56 m high model structure was constructed of columns with cross section of 8×8 mm. Damage was defined as a reduction in stiffness and introduced by replacing the columns with elements having 6×6 mm cross section. Seven different structural damage cases described by different number of columns with the reduced cross section were considered in the study. During the shaking table experiment the base of the structure was excited under the sweep-sine loading. The results of the study show a characteristic decrease in the natural frequencies with the progression of damage. This trend has been especially observed for the first natural frequency, for which the decrease in the frequency value has been found to be uniform. The results of further analysis show the scattered values of the structural damping ratios without showing any relation with the level of structural damage.
机译：通过测量动态结构特性的变化来诊断损伤的方法已经进行了很多年的研究。然而，与机械或航空工程相反，该方法在土木工程结构中的实际应用遇到了许多困难，这表明需要进一步研究。由于这种测试的结果非常有限，因此特别需要进行振动台研究。因此，本文的目的是展示基于两层钢框架建筑模型的振动台研究结果。 1.56 m高模型结构由截面为8×8 mm的圆柱构成。损坏定义为刚度的降低，并通过用横截面为6×6 mm的元件替换圆柱来引入破坏。在研究中考虑了七种不同的结构损坏案例，这些案例由不同数量的横截面减小的圆柱描述。在振动台实验期间，结构的基础在正弦扫描载荷下被激发。研究结果表明，自然频率随损伤的发展而降低。对于第一固有频率，尤其已经观察到了这种趋势，对于该固有频率，发现其频率值的减小是均匀的。进一步分析的结果表明，结构阻尼比的分散值与结构破坏程度没有任何关系。

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