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| 地震作用下防屈曲支撑减震结构附加有效阻尼比计算及变化规律研究 | |
| 引用本文： | 吴克川,陶 忠,韦光兰,胡大柱,余文正.地震作用下防屈曲支撑减震结构附加有效阻尼比计算及变化规律研究[J].振动与冲击,2016,35(2):146-152. |
| 作者姓名： | 吴克川 陶 忠 韦光兰 胡大柱 余文正 |
| 作者单位： | 1.昆明理工大学 土木工程系，昆明 650500； 2. 上海应用技术学院 城市建设与安全工程学院，上海 201418； 3.上海蓝科建筑减震科技有限公司，上海 200433 |
| 摘 要： | 基于《建筑消能减震技术规程》(JGJ 279-2013)的附加有效阻尼比计算方法，推导防屈曲支撑(Buckling-Restrained Brace， BRB)减震结构等效单自由度体系的附加有效阻尼比计算式，分析主体结构处于不同工作阶段附加有效阻尼比变化规律，并用自由振动衰减法验证其变化规律的正确性。结果表明，主体结构弹性时，附加有效阻尼比随结构变形增加先增大后减小；主体结构塑性时，BRB附加给结构的有效阻尼比与结构屈服后刚度有关。讨论阻尼器型BRB(记为第Ⅲ类)设计原则，并分析结构第一阶段抗震设计时附加有效阻尼比的取值原则。 |
| 关 键 词： | 防屈曲支撑 附加阻尼比 消能减震 自由振动衰减 双线性模型 |
Research on additional damping ratio calculation of buckling-restrained brace structure and its variety law under earthquake |
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| WU Ke-chuan,TAO Zhong,WEI Guang-lan,HU Da-zhu,YU Wen-zheng.Research on additional damping ratio calculation of buckling-restrained brace structure and its variety law under earthquake[J].Journal of Vibration and Shock,2016,35(2):146-152. | |
| Authors: | WU Ke-chuan TAO Zhong WEI Guang-lan HU Da-zhu YU Wen-zheng |
| Affiliation: | 1. Civil Engineering Institute ,Kunming University of Science and Technology,Kunming 650500,china; 2 .College of Urban Construction and Safety Engineering, Shanghai Institute of Technology, Shanghai 201418, China; 3.Shanghai Lanke Building Damping Technology Co. ,Ltd. ,Shanghai 200433，China |
| Abstract: | Based on the calculation method of "Technical specification for seismic energy dissipation of building", the additional effective damping ratio formula for single-degree-freedom system with buckling restrained braces has been derived,additional effective damping ratio of structure is analyzed under different conditions, and the results are verified by free vibration decrement method. The results show that:before the structure yields,the additional effective damping ratio increased at first and then decreased with the increment of the structure deformation,after the structure yields,the additional effective damping ratio varies with the stiffness of structure.The design principles of damping buckling restrained brace and the selection method of the additional effective damping ratio its provide to the structure are also discussed. |
| Keywords: | buckling restrained brace additional damping ratio energy dissipation free vibration decrement bilinear model |
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