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Investigation of Snow Load Effects on Modal Parameters of a Steel Structure Roof

机译：雪荷载对钢结构屋盖模态参数影响的研究

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摘要

Snowfall is one of the environmental factors that can cause effects on the identification of structural modal parameters. For the steel structure roof of the Harbin Railway Station, effects of snow load to the modal parameters were investigated. A single-span simply supported beam was analysed from the theoretical perspective to study the principles. FEM-based analyses were conducted for the steel structure roof to illustrate the significance of the snow load effects to modal parameters. Uniformly and nonuniformly distributed snow loads were regarded as the essential factors influencing modal frequencies and mode shapes. Monitoring response data are collected and analysed to confirm the accuracy of analytical results. It is concluded that snowfall-induced variations on structural stiffness and mass matrices reduce the modal parameters and alter the mode shapes. The differences between the change regulations of the various modes are closely related to the distributions of snow loads. The theoretical and numerical analytical results are validated to be feasible and credible using temperature, axial strain, and acceleration measurements from the Harbin Railway Station field monitoring system.
机译：降雪是可能对结构模态参数的识别产生影响的环境因素之一。对于哈尔滨火车站的钢结构屋顶，研究了雪荷载对模态参数的影响。从理论的角度分析了单跨简支梁，以研究其原理。对钢结构屋顶进行了基于有限元分析，以说明雪荷载效应对模态参数的重要性。均匀和不均匀分布的雪荷载被认为是影响模态频率和模态形状的必要因素。收集监视响应数据并进行分析，以确认分析结果的准确性。结论是，降雪引起的结构刚度和质量矩阵变化会降低模态参数并改变模态形状。各种模式的变化规律之间的差异与雪荷载的分布密切相关。利用哈尔滨火车站现场监测系统的温度，轴向应变和加速度测量结果，验证了理论和数值分析结果的可行性和可信性。

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  • 来源
    《Shock and vibration》 |2018年第8期|7018325.1-7018325.24|共24页
  • 作者

    Guan Xiaoshu; Chen Huipin; He Jian; Sun Xiaodan;

  • 作者单位

    Harbin Engn Univ, Coll Aerosp & Civil Engn, Harbin 150001, Heilongjiang, Peoples R China;

    China Railway Construct Engn Grp Co Ltd, Beijing Branch, China Railway Construct Engn Grp, Beijing 100160, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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