某钢-混凝土混合结构动力振动响应分析  

Analysis on Dynamic Vibration Response of a Steel-Concrete Hybrid Structure

作　　者：姚泽良[1] 白国良[2] 党发宁[1] 刘林[2] 

机构地区：[1]西安理工大学水利水电学院,西安710048 [2]西安建筑科技大学土木工程学院,西安710055

出　　处：《武汉理工大学学报》2010年第9期199-202,共4页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(50778150)

摘　　要：钢筋-混凝土结构质量和刚度分布极不均匀,与动力设备耦合振动明显。采用有限元软件SAP2000建立足尺计算模型,研究了结构的动力性状,利用谐响应分析方法计算了不同工况下不同频率时结构动力振动响应,分析了典型节点的位移响应和峰值频率对应的应力。结果表明,结构扭转和振型耦合作用明显。低阶共振大于高阶共振,风机应避开结构前3阶频率。当风机同向全开且风机频率与结构自振频率一致时,结构动位移最大。位移和内力随风机变频变向而频繁变化,应注意疲劳破坏,建议用良好冲击韧性和冷弯性能的钢材和摩擦型高强螺栓。Steel-concrete hybrid structural stiffness and mass is highly non-uniform at vertical direction.The couple vibration of the structure and dynamic equipments is obvious.A calculation model was established with the finite element software SAP2000.Its dynamic properties were researched.Its dynamic vibration response under different working conditions and different frequencies is analyzed with the harmonic response analysis method.The displacement and stress response of typical nodes is analyzed.Results show that the structural torsion and mode couple is obvious.The sympathetic vibration under the low frequency excitation of the fans is bigger than that under the high frequency excitation of the fans.The fans＇ frequencies should be kept away from the front three steps＇ frequency of the structure.The structural dynamic displacement is maximal when all fans are opened at the same direction and their frequencies are same as the structural natural frequency.The structural fatigue breakage should be noticed because its displacement and internal force is changed with the change of the fans＇ frequency and turning.It is suggested that the steel having good impact toughness and cool bend properties and the bolts having friction and high strength properties should be used.

关 键 词：钢-混凝土混合结构 共振 动力行为 疲劳 

分 类 号：TU398.9[建筑科学—结构工程] TU271.1