摘要
从能量原理出发,推导出采用不同材料加层结构的阻尼比的精确计算公式;同时,根据剪切变形为主的结构特点,推导出适合于手算的不同材料加层结构阻尼比的计算公式,计算公式只与结构振型和楼层质量相关,与精确公式相比有较好的精度。文章通过2个算例分析发现:采用不同材料加层结构的各振型阻尼比不同,各振型阻尼比受加层结构阻尼比的影响也不同;用纯剪切型结构直接计算框架结构的振型阻尼比存在较大误差。
Significant differences occur in the damping ratio after adding different material stories on the top of the original building. The precise formule for the damping ratio of different type of story-added structures are deduced based on energy principle. According to the shear structure characteristics, the formule adapted to the written calculations are derived. The formule is only related to the vibration mode and story mass with good precision compared with precise formula. Two calculation examples are suggested. It is found that modal damping ratio varies with different story-added material and different damping ratio of story-added structure respectively. There is a big error for calculating the damping ratio of frame structure directly with the shear frame structure model.
出处
《工程抗震与加固改造》
2008年第2期91-95,共5页
Earthquake Resistant Engineering and Retrofitting
关键词
非比例阻尼
加层
能量法
阻尼比
non-classical damping
story-adding
energy method
damping ratio
