粘弹性阻尼器在网架结构减震控制中的优化设置  

Optimum installation of viscoelastic dampers in space frame structures

作　　者：薛素铎[1] 凌和海[1] 

机构地区：[1]北京工业大学建筑工程学院,北京100022

出　　处：《建筑结构学报》2007年第4期51-57,75,共8页Journal of Building Structures

基　　金：北京市自然科学基金资助项目(8042008);北京市属市管高等学校人才强教计划资助项目

摘　　要：将粘弹性阻尼器应用于空间网架结构,给出了网架结构体系的控制原理.分别从控制网架结构的节点位移、节点加速度和杆件轴力三个方面选定控制目标,编制了有限元分析程序.研究探讨了粘弹性阻尼器在网架结构减震控制中的优化设置,分析了阻尼器在网架结构中的布置位置、布置数量、阻尼器支撑倾斜角度等参数的影响,对在各种工况下的减震效果进行了对比分析.结果表明,在结构中合理布置阻尼器可显著提高阻尼器的减震控制率.最后,提出了在结构中设置粘弹性阻尼器的基本优化步骤,对粘弹性阻尼器在网架结构中的优化设置提出如下建议：（1）阻尼器宜布置在跨度等分点处;（2）阻尼器沿结构纵向布置优于沿横向布置,纵横向综合布置效果最佳;（3）阻尼器支撑倾斜角度宜取α＝45°～60°;（4）阻尼器与网架下弦节点连接优于与网架上弦节点连接;（5）阻尼器的布置数量宜适中.本文成果可为粘弹性阻尼器在网架工程中的实际应用和设计提供借鉴.Optimum installation of viscoelastic dampers in space frame structures is investigated in this paper. The principle for vibration control of the structure is introduced. Control objectives are determined by considering nodal displacement, nodal acceleration, and member axial forces, separately. A computer program is developed for optimum analysis of control performance. The effects of damper arrangements, positions, numbers, and inclined angle of damper supporting, and so forth, are analyzed and discussed. A comparison is made between vibration reduction efficiencies under different cases of damper installations. It is indicated that optimum installation of viscoelastic damper in structures will significantly improve control effectiveness for the structure. Finally, fundamental steps for optimization of viscoelastic dampers in practical structures are proposed. Following suggestions are provided for optimum installation of dampers： （1） the dampers would be better to be located in equally divided positions along the span; （2） installing dampers along longitudinal side is better than along transverse side, and it is the best to install the dampers jointly in both sides; （3） the optimum inclined angle of damper supporting is suggested as a = 45~ ~ 60~; （4） connecting dampers to the lower chord of the structure is better than to the upper chord; （5） the number of dampers should be properly determined. This paper provides a good reference for practical application and design of viscoelastic dampers in space frame structures.

关 键 词：粘弹性阻尼器 网架结构 优化设置 

分 类 号：TU311.3[建筑科学—结构工程]