圆柱面巨型网格结构的粘滞阻尼器减震研究  

Study on Vibration Reduction of Cylindrical Reticulated Mega-structures with Viscous Dampers

作　　者：贺拥军[1] 郭文豪[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《防灾减灾工程学报》2017年第2期230-236,共7页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家重点研发计划项目(2016YFC0701201);湖南省高校科技创新团队滚动资助计划[湘财教指(2015)616号]资助

摘　　要：以圆柱面交叉立体桁架系巨型网格结构为研究对象,在多遇地震下,选取结构的节点位移、加速度峰值为控制指标,运用ANSYS软件采用时程分析法从粘滞阻尼器的布置方案、阻尼系数等方面研究减震效果。比较分析后确定较优的布置方案及阻尼系数,进一步分析罕遇地震时的减震效果。结果表明,多遇地震时,采用大网格均匀布置的方式较部分大网格集中布置有更好的减震效果。随着阻尼系数的增大,位移减震率呈增长速率逐渐减小的递增趋势。当阻尼系数相对较小时,加速度减震率增长速率很快,但随阻尼系数增大会有降低的趋势。罕遇地震时,减震控制下的结构响应明显减小,屈服杆件大幅减少,粘滞阻尼器表现出较好的耗能特性。该研究结果对粘滞阻尼器应用于巨型网格结构中的减震设计有指导意义。The cylindrical latticed-intersected-three-dimensional-bean〉system reticulated megastructure is selected to research the efficiency of vibration reduction of viscous dampers from the aspects of the distribution of viscous dampers and damping coefficient based on the measurements of the peak values of displacement and acceleration by using time-history method under frequent earthquakes. The efficiency of dampers under rare earthquake is explored combined with the bet- ter distribution and coefficient of viscous dampers found above. The calculation results show that the uniform arrangements have higher efficiency of vibration reduction than lumped arrange- ments. With the increase of damping coefficient, the vibration reduction rate of displacement has the trend of growth which becomes slower. The reduction rate of acceleration increases rapidly with relatively low damping coefficient, while the rate tends to decrease as the damping coeffi- cient increases. Under rare earthquake, the response and the number of yielding bars of struc- tures that takes viscous dampers to control vibration reduction decrease obviously. The result is aimed to provide reference for the design of viscous dampers to reduce the vibration of cylindrical reticulated mega-structure.

关 键 词：巨型网格结构 粘滞阻尼器 减震控制 时程分析 

分 类 号：TU393.3[建筑科学—结构工程] TU323.4