上海中心大厦伸臂桁架与巨柱和核心筒连接的抗震性能试验研究
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摘要
在上海中心大厦伸臂钢桁架与柱和核心筒连接单调静力试验的基础上,进行了该连接的抗震性能试验。试验设计了3种不同的反复加载路径,以考察普通循序渐增加载方式和不同损伤累积后再以普通循序渐增加载方式下试件滞回特性和耗能能力的差别。结果表明:在几种不同路径反复荷载作用下,试件最终破坏均发生在伸臂桁架斜腹杆和下弦杆端部,伸臂桁架与巨柱和核心筒连接的节点板塑性应力水平较低,滞回曲线形状饱满,延性较好,满足结构抗震设计要求;伸臂桁架在不同加载路径下的累积塑性耗能引起的塑性损伤对伸臂桁架的滞回性能退化有一定影响,但并不显著;单斜腹杆作为伸臂桁架耗能的主要构件,其累积轴力耗能占伸臂桁架总耗能的70%左右。
Seismic tests were carried out on the outrigger truss and its connections with mega column and core tube of the Shanghai Tower following the previous monotonic experiments.Three different loading protocols were designed to investigate the effects of various damage accumulation processes on the hysteretic and energy dissipation behaviors of the specimens.Experimental results show that all the specimens fail due to excessive plastic deformation and inelastic local buckling of the web member,as well as fracture at the low chord,while the connecting elements of the outrigger to main structural members develop small plastic strains.The specimens exhibit full hysteretic loops and good ductility.So designed outrigger truss and its connection can meet the requirements for seismic design.The analysis reveals that the damage cumulated under different loading protocols has certain but not very significant effect on the degradation of seismic performance of specimens.About 70% of the energy dissipation in the form of cumulated axial force energy is in the diagonal web member,making it the main energy dissipation member in the outrigger truss.
Seismic tests were carried out on the outrigger truss and its connections with mega column and core tube of the Shanghai Tower following the previous monotonic experiments.Three different loading protocols were designed to investigate the effects of various damage accumulation processes on the hysteretic and energy dissipation behaviors of the specimens.Experimental results show that all the specimens fail due to excessive plastic deformation and inelastic local buckling of the web member,as well as fracture at the low chord,while the connecting elements of the outrigger to main structural members develop small plastic strains.The specimens exhibit full hysteretic loops and good ductility.So designed outrigger truss and its connection can meet the requirements for seismic design.The analysis reveals that the damage cumulated under different loading protocols has certain but not very significant effect on the degradation of seismic performance of specimens.About 70% of the energy dissipation in the form of cumulated axial force energy is in the diagonal web member,making it the main energy dissipation member in the outrigger truss.
引文
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[3]丁洁民,巢斯,赵昕,等.上海中心大厦结构分析中若干关键问题[J].建筑结构学报,2010,31(6):122-131.(DING Jiemin,CHAO Si,ZHAO Xin,et al.Critical issues of structural analysis for theShanghai Center project[J].Journal of BuildingStructures,2010,31(6):122-131.(in Chinese))
[4]杨晓明,丰定国,杨睿.不同加载制度下钢筋混凝土柱抗震性能的试验研究[J].工业建筑,2005,35(9):42-45.(YANG Xiaoming,FENG Dingguo,YANG Rui.Experimental study on a seismicperformance of RC column under different loadingsystems[J].Industrial Construction,2005,35(9):42-45.(in Chinese))
[5]Scribner C F,Hwang Tze-How.江近仁,译.加荷过程的变化对钢筋混凝土受弯构件循环反应的影响[J].国外地震工程,1982(1):55-60.(Scribner C F,Hwang Tze-How.Translated by JIANG Jinren.Effect ofload history variation on cyclic response of R.C flexuralmembers[J].World Earthquake Engineering,1982(1):55-60.(in Chinese))
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