Abstract
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.
Highlights
Over the past thirty years, damage identification has been focused on the structural health monitoring (SHM) field
Environmental factors can deter the application of these methods, which can obstruct the identification of modal parameters and reduce the reliability of SHM
Environmental factors such as snow, wind, temperature, freeze, and thaw conditions alter the response of structures and impeding reliable damage identification. erefore, it is of great interest to study the responses of structures under environmental factors and the mechanisms that cause these responses
Summary
Over the past thirty years, damage identification has been focused on the structural health monitoring (SHM) field. Based on the load-bearing capacity status and the failure on actual structures, a number of studies of the effects of snow loads on specific structures have been published and serve as references for related analysis methods. Lazzari et al proposed nonlinear dynamic analysis methods considering the static and dynamic effects of wind and snow on the roof of Montreal Olympic Stadium to assess the associated structural behaviour [8]. Research on the changes of modal parameters caused by snow loads is helpful to the safety assessment of long-span spatial structures. Studies on this topic can reduce the impact of snowfall and improve the accuracy and reliability of damage assessment based on SHM.
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