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Study on natural vibration and forced vibration of the steel-concrete hybrid structure
Author(s): 
Pages: 261-268
Year: Issue:  2
Journal: Journal of Vibration Engineering

Keyword:  hybrid structurenatural vibration behaviorforced vibrationmodel experimentnumerical simulation;
Abstract: 对风机激励下钢-混凝土结构的振动响应开展了模型试验和有限元对比计算分析,系统研究了结构的自振性能、共振形态、受迫振动特性、动位移和动应变等力学行为.研究表明:试验数据与计算结果吻合较好.前两阶振型接近,振型在A形架处有回收趋势,说明该处质量和刚度发生突变.同一测点东西向和南北向反应峰值不同时出现,角部测点的振动反应比中间测点大.悬挑部位测点振动响应较大,说明风机激振力导致了局部杆件振动.结构振动响应随着风机开启数量的增加而增大.风机全部开启时结构最大振动位移约0.1mm,最大动应变为256.5×10-6.结构低阶共振响应大于高阶共振响应,风机高频运转时出现局部杆件强迫振动.建议避开结构前三阶频率,同时应采用合理构造措施防止构件疲劳破坏.
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