考虑行人-结构相互作用的悬挑钢筋桁架楼承板振动控制研究  

Human-induced vibration and control for cantilever steel bar truss deck slab based on pedestrain-structure interaction

作　　者：朱前坤[1,2] 刘路路 杜永峰 陈凯[1] 

机构地区：[1]兰州理工大学防震减灾研究所,甘肃兰州730050 [2]大连理工大学土木工程学院,辽宁大连116024 [3]东南大学土木工程学院,江苏南京210096 [4]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050

出　　处：《建筑结构学报》2018年第1期99-108,共10页Journal of Building Structures

基　　金：国家自然科学基金项目(51508257,51668042,51778276);甘肃省高等学校科研项目(2015B-34)

摘　　要：利用新型微电子机械系统AH100B加速度传感器测得连续的人行荷载时程,并建立了傅里叶级数荷载模型。为考虑行人-结构动力相互作用,将人体等效为具有质量、刚度、阻尼的单自由度生物力学模型,确定了行人模型各个参数与步行频率及人体本身质量的拟合表达式。以甘肃科技馆某两层悬挑的钢筋桁架楼承板为工程背景,采用ANSYS有限元软件仿真模拟结构在人行荷载作用下的振动响应,对比分析表明：考虑行人-结构相互作用后,其加速度响应要降低至少10.59%。针对结构最大加速度响应超过舒适度指标限值的情况,分别以单个调谐质量阻尼器和新型3-DOF调谐质量阻尼器对结构的振动响应进行控制,均取得了较好的减振效果,且采用阻尼比较小的3-DOF调谐质量阻尼器效果更好。The continuous pedestrian load time history can be got via the new micro electronic mechanical systems AH100B acceleration sensor and Fourier series loading model can be established through the experiment. In order to consider pedestrain-structure dynamic interaction, the human body can be made an equivalent as a biomechanical model with one degree of freedom of mass, stiffness and damping. And then the fitting expressions of the parameters of the pedestrian model, the step frequency and the mass of the human body are determined. Then selecting a two-layer cantilever steel bar truss deck slab of Gansu Science and Technology Museum as engineering background, using ANSYS finite element software to simulate the human-induced vibration response of the structure, The comparative analysis shows that the acceleration response is reduced by at least 10.59% after considering the pedestrain-structure interaction. According to the case that the maximum acceleration response of the structure exceeds the limit of serviceability index, the vibration response of the structure is controlled by a single tuned mass damper and a new 3-DOF tuned mass damper respectively. Both of them achieve better vibration damping effect, and the 3-DOF tuned mass damper with smaller damping is better.

关 键 词：钢筋桁架楼承板 傅里叶级数荷载模型 人体生物力学模型 人致加速度响应 振动控制 

分 类 号：TU375.5[建筑科学—结构工程] TU311.41