摘要
现有的黏滞阻尼器布置机构的位移放大系数计算公式是基于结构剪切型侧移模式推导的,而多高层建筑结构的侧移模式一般为弯剪型,这有可能导致采用现有方法计算多高层建筑结构中的黏滞阻尼器的位移放大系数和附加阻尼比不准确。采用解析几何方法,推导了单层弯剪型结构和一般多高层结构中阻尼器布置机构位移放大系数的计算公式,包括对角布置机构、剪刀撑布置机构、下套索布置机构、上套索布置机构。按照阻尼器布置机构位移放大系数现有计算方法和本文提出的方法,采用应变能法计算了多层钢框架结构中布置黏滞阻尼器的附加阻尼比,并与自由振动衰减法的计算结果进行了对比,本文方法的计算误差不到1%。这验证了本文提出的考虑弯剪变形的黏滞阻尼器布置机构位移放大系数的计算方法对一般多高层结构具有更好的计算精度。
The existed calculation formula for the magnification factor of viscous damper installation configuration is derived based on the structural shear lateral displacement mode, but the lateral displacement modes of multi-storey and high-rise buildings are generally shear-bending type, which may result in inaccuracy for calculating the magnification factor and the additional damping ratio of viscous damper installation configuration in multi-storey and high-rise buildings. Formulas for magnification factors of viscous damper installation configurations, including diagonal, scissors-jack, lower toggle and upper toggle brace configuration, installed respectively in single-story shear-bending structures and multi-storey and high-rise structures are derived using analytical geometry method. According to the existed calculation method and the method proposed in this paper, the strain energy method is used to calculate the additional damping ratios of viscous dampers installed in a multi-story steel frame structure, and the results are compared with those obtained from the free vibrationattenuation method. The calculation error is less than 1%, which indicates that the calculation method for the magnification factor of viscous damper installation configuration considering structural shear-bending deformation proposed in this paper has better calculation accuracy for multi-storey and high-rise buildings.
作者
朱丽华
于安琪
李红庆
Zhu Lihua;Yu Anqi;Li Hongqing(State Key Laboratory of Green Building in Western China,Xi’an University of Architecture&Technology,710055,Xi’an,China;School of Civil Engineering,Xi’an University of Architecture&Technology,710055,Xi’an,China)
出处
《应用力学学报》
CAS
CSCD
北大核心
2020年第4期1689-1695,I0021,I0022,共9页
Chinese Journal of Applied Mechanics
基金
国家自然科学基金(51878552)
国家重点研发计划资助项目(2017YFC0703600)
陕西省重点研发计划重点产业创新链(群)项目(2018ZDCXL-SF-03-03-01)。
关键词
黏滞阻尼器
阻尼器布置机构
位移放大系数
附加阻尼比
弯剪型结构
viscous damper
damper installation configuration
magnification factors
additional damping ratio
shear-bending type structure
作者简介
第一作者:朱丽华,男,1979年生,博士,西安建筑科技大学,教授,研究方向——地震工程、结构振动控制。E-mail:zhulihuaxa@163.com。
