低屈服点钢防屈曲支撑在桁架结构中的减震研究  

Vibration Reduction of Low Yield Point Steel Buckling Restrained Brace of Truss Structure

作　　者：王秀丽[1,2] 梅凤军 李鹏博[3] 

机构地区：[1]兰州理工大学空间结构研究所,甘肃兰州730050 [2]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050 [3]中国北车唐山轨道客车有限责任公司,河北唐山063035

出　　处：《甘肃科学学报》2015年第5期80-84,共5页Journal of Gansu Sciences

基　　金：国家自然科学基金项目(51278236);国家科技支撑计划(2011BAK12B07)

摘　　要：以实际工程为背景,在三种地震波作用下,对带有低屈服点钢防屈曲耗能支撑的钢桁架屋盖结构进行减震性能分析,通过在上部大跨度空间钢桁架加入低屈服点钢防屈曲支撑,通过不同的防屈曲布置方式,设置不同的防屈曲布置方案,并和无BRB桁架结构的动力响应进行对比分析,得出带有防屈曲耗能支撑钢桁架减震效果指标。经过对防屈曲耗能支撑结构进行罕遇地震作用下时程分析发现,带有防屈曲耗能支撑的桁架结构的轴力减震效果明显,对钢桁架上弦杆某些关键杆件,其上弦杆、下弦杆和腹杆的轴力减震效果良好,其轴力减震率分别高达30.6%,36.0%和20.1%,可见,这种结构具有良好的经济价值和实际意义。On the basis of the actual project, the vibration-reducing performance of the steel truss roof structure supported with low yield point steel buckling restrained braces was analyzed under the action of three seismic waves. A different anti-buckling layout scheme was devised through the addition of low yield point steel buckling restrained braces to the upper large-span steel truss and the different arrangements of buckling restrained braces. And through the comparison with the dynamic response of the steel truss without braces,the indices of vibration reduction effects of the steel truss with buckling restrained braces were obtained. The time history analysis of steel trusses with buckling restrained braces under the action of rare earthquakes showed that the vibration of key rods of the steel truss was excellently reduced through the axial force of its upper chord, bottom chord and web member, and the vibration reduction rate of the axial force was respectively as high as 30.6% （upper chord）,36.0% （bottom chord） and 20. 1% （web member）.

关 键 词：防屈曲耗能支撑 时程分析 钢桁架 减震性能 

分 类 号：TU391[建筑科学—结构工程]