基于动态试验方法的金属框架刚度评定

Proceedings of the International Symposium "Engineering and Earth Sciences: Applied and Fundamental Research" dedicated to the 85th anniversary of H.I. Ibragimov (ISEES 2019) Pub Date : 2019-08-01 DOI:10.2991/ISEES-19.2019.45

M. Nesterenko, V. Zhadanov, A. Nesterenko, G. Stolpovskij, P. Romanyuk

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引用次数: 1

摘要

．本文介绍了一种通过动态测试来评估金属框架抗弯刚度的方法。在动力试验中，强迫振荡的来源是一个具有阶跃频率控制的机械振荡器形式的模态激振器。给出了框架固有频率、激振器强迫振荡频率和对数阻尼减量的确定结果。计算了动力力和动力系数。对框架单元进行了刚度评估，并与有限元模型中规定的理论值进行了比较。模型在LIRA-SAPR设计软件2013中进行编译。对于框架单元，根据实验数据和模型数据计算了弯曲形状的曲率。单元的实验刚度比理论刚度平均小8.81%。提出的方法允许在测量现场实现结构弯曲刚度的无损检测。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Stiffness Evaluation of a Metal Frame by the Method of Dynamic Tests

. The article presents the method for assessing bending stiffness by dynamic testing using an example of the experienced metal frame. The source of forced oscillations during dynamic tests was a modal vibration exciter in the form of a mechanical oscillator with stepwise frequency control. The results of determining the natural frequencies of the frame, the frequency of forced oscillations of the exciter and logarithmic damping decrement are shown. Dynamic force and dynamic coefficient were calculated. Stiffness evaluation of the frame elements was carried out in comparison with its theoretical value specified in the finite element model. The model was compiled in the LIRA-SAPR design software 2013. For the frame elements, the curvature of a bend shape was calculated from experimental and model data. The experimental stiffness of elements on average was 8.81% less than the theoretical. The proposed ap-proach allows realizing non-destructive testing of a bending stiffness of a structure at the measurement site.

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来源期刊

Proceedings of the International Symposium "Engineering and Earth Sciences: Applied and Fundamental Research" dedicated to the 85th anniversary of H.I. Ibragimov (ISEES 2019)

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