大跨度钢连廊舒适度分析及减振控制  

Vibration comfort analysis and control of large-span steel corridor

作　　者：郭宏超[1] 王凯励 王德法[1] 刘云贺[1] 蔡玉军[2] 高志宏[2] GUO Hongchao;WANG Kaili;WANG Defa;LIU Yunhe;CAI Yujun;GAO Zhihong(School of Civil Engineering and Architecture,Xi’an University of Technology,Xi’an 710048,China;China Railway The First Survey and Design Institute Group Co.,Ltd.,Xi’an 710043,China)

机构地区：[1]西安理工大学土木建筑工程学院,陕西西安710048 [2]中铁第一勘察设计院集团有限公司,陕西西安710043

出　　处：《西安理工大学学报》2021年第2期269-277,共9页Journal of Xi'an University of Technology

基　　金：国家自然科学基金资助项目(51978571,51722907);陕西省教育厅重点实验室科学研究计划资助项目(18JS072);陕西省科技厅自然科学基础研究计划资助项目(2018JM5006);铁一院科学研究计划资助项目(院科16-59-01)。

摘　　要：针对某45 m大跨度钢桁架连廊的振动舒适性问题,建立了结构有限元模型,对比了目前国内外常用的舒适度标准,选择以AISC-11为代表的能同时考虑振动强度及振动环境的标准进行评价,选取正常使用时可能出现的各种不利工况进行时域及频域内的加速度响应分析。同时对影响大跨度结构舒适性的楼板厚度、边界条件、人的动力特性等进行了参数分析。结果表明:楼板厚度可有效改善大跨度结构的使用舒适度,楼板边界条件的影响较小,人的阻尼特性可以吸收结构振动能量降低结构的振动加速度,不考虑人作用时的结果偏于保守。对不满足舒适度标准的连廊进行减振控制分析,调谐质量阻尼器TMD可有效降低结构的人致振动响应,TMD质量比越大减振效果越好,当质量比为0.22%时,减振效率可达64%;多频率TMD可扩大减振的频带范围,使其更具有鲁棒性,当质量比为0.64%时,可以使减振率进一步提高15%。Aiming at the vibration comfort of the 45 m long-span steel truss corridor,a structural finite element model is established.Compared with commonly used comfort standards at home and abroad,AISC-11 is selected as a representative considering vibration at the same time.Evaluation on the intensity and vibration environment standards,and selection of various unfavorable conditions that may occur during normal use are made to perform acceleration response analysis in the time domain and frequency domain.At the same time,the parameters for floor thickness,boundary conditions and human dynamic characteristics affecting the comfort of large-span structures are analyzed.The results show that the thickness of the floor slab can effectively improve the comfort of the long-span structure,that the boundary conditions of the floor slab have little effect,and that the human damping characteristics can absorb the vibration energy of the structure and reduce the vibration acceleration of the structure.If human actions are not considered,the result will be conservative.The performing vibration reduction control analysis of corridors do not meet comfort standards.Tuned mass damper(TMD)can effectively reduce human-induced structural vibration response.The larger the TMD mass ratio,the better the damping effect.When the mass ratio is 0.22%,the damping efficiency can reach 64%;the multi-frequency TMD can expand the damping frequency band range and make it stronger.When the mass ratio is 0.64%,the damping rate can be further increased by 15%.

关 键 词：大跨度钢结构 人致振动 人行荷载 舒适度 人结构相互作用 调谐质量阻尼器 

分 类 号：TU311.3[建筑科学—结构工程] TU312.3