忽略梁板轴线相对偏移对人行荷载下大跨楼盖TMD减振的影响  

Effect of Neglecting Neutral Axis Difference on the Vibration Reduction with TMD in Long-span Floor under Human Excitation

作　　者：汪天雷 谢杰文 刘轩 陈海森 WANG Tianlei;XIE Jiewen;LIU Xuan;CHEN Haisen(School of Civil Engineering of Guangzhou University,Guangzhou 510006,China)

机构地区：[1]广州大学土木工程学院,广州510006

出　　处：《结构工程师》2018年第5期98-105,共8页Structural Engineers

基　　金：国家自然科学基金项目(51378135)

摘　　要：为研究忽略梁板轴线相对偏移对大跨楼盖在人行荷载下TMD(调谐质量阻尼器)减振的影响,以某酒店会议中心大跨楼盖为研究对象,将大跨楼盖分为梁板轴线对齐模型和梁顶与板顶齐平模型,分别进行动力特性分析,针对各自主要竖向振型加设人行荷载,依据各人行荷载下楼盖的振动响应,对两种楼盖模型分别设计了不同的TMD减振方案。对比发现:相比于梁板轴线对齐的楼盖结构,考虑梁板轴线相对偏移时,楼盖结构的梁板刚度和竖向自振频率均偏大,各人致激励工况下的振动响应和TMD减振设计方案完全不同。最后,将梁板轴线对齐模型的TMD减振方案以同样位置布置于梁顶与板顶对齐模型时,发现TMD无明显的减振效果,说明了在对大跨楼盖做人行荷载下的舒适度分析时,应充分考虑梁板轴线相对偏移的影响。The purpose of this article is to study the effects of the vibration reduction with TMD(tuned mass damper)in thelong-span floor under human excitation,neglecting neutral axis difference.Taking a hotel conference center as the research object,we divided the large-span floor into the model of beam’s axis aligned with plate’s axis and the model of beam’s top aligned with plate’s top,analyzing the dynamic characteristicsrespectively.Then,we set human excitation loadscorresponding to each main vibration shape.According to the floor vibration responseunderrespectivehuman excitation load,the two floor modelsare respectively designed with different TMD damping scheme.Compared withthe modelswith thebeam’s axis aligned with plate’s axis,the stiffness and vertical frequency of the floor are bigger,when in view of the relative offset between beam and plate’s axis,andeach vibration response under the human excitations and the TMD damping scheme is completely different.At last,when putting the TMD damping schemeapplied to the models with beam’s axis aligned with plate’s axis on the models with beam’s top aligned with plate’s top,it shows thatthe TMD has no obvious effect of vibration reduction,illustratingthat when the long-span floor is analyzed under the human excitation,the relative offset between beam and plate’s axis should be concernedfully.

关 键 词：大跨楼盖 梁板轴线相对偏移 振动舒适度 TMD 减振 

分 类 号：TU311.3[建筑科学—结构工程]