某超高结构加强层的“嵌固”作用讨论
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摘要
伸臂桁架能够协调核心筒和外部框架的变形,使结构整体刚度显著增加,但是加强层引起结构整体刚度突变,对其以上楼层形成"嵌固"作用。兰州市某超限高层采用钢管混凝土框架-核心筒-伸臂桁架结构体系,对该结构进行分析表明加强层处倾覆力矩、剪力和墙肢拉应力产生突变且明显增大,罕遇地震下加强层处是仅次于结构底部的第二屈服部位。
Outrigger truss could coordinate the deformation between core tube and external frame,and make the fstructural integral stiffness increase significantly,however stiffness mutation is caused by strengthened story,which produced fixed effect. A super highrise concrete filled steel tube frame-core tube-outrigger truss structure is discussed,the results show that overturn moment,shear and tensile stress of wall panel change suddenly and increase obviously near strengthened story. This region is the second yield part of the structure under rare earthquake.
Outrigger truss could coordinate the deformation between core tube and external frame,and make the fstructural integral stiffness increase significantly,however stiffness mutation is caused by strengthened story,which produced fixed effect. A super highrise concrete filled steel tube frame-core tube-outrigger truss structure is discussed,the results show that overturn moment,shear and tensile stress of wall panel change suddenly and increase obviously near strengthened story. This region is the second yield part of the structure under rare earthquake.
引文
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[2]王斌,陈以一,等.超高层结构伸臂桁架的承载力及刚度简化计算[J].同济大学学报(自然科学版),2014,42(3):358-364Wang Bin,Chen Yi-yi,Zhao Xian-zhong. A simplified model on strength and stiffness of outrigger truss in super high-rise structure[J]. Journal of Tongji University(Natural Science), 2014, 42(3):358-364(in Chinese)
[3]卫文,陈星.某超高层建筑加强层设置分析[J].建筑结构,2013,43(14):48-52Wei Wen,Chen Xing. Analysis on strengthened story of a super high-rise building[J]. Building Structure,2013,43(14):48-52(in Chinese)
[4]朱伟亮,杨春霞,等.国家金融信息大厦核心筒墙肢拉应力控制研究[J].建筑结构,2014,44(18):18-21Zhu Wei-liang,Yang Chun-xia,et al. Research on the seismic induced tension stress control of core wall in National Financial Information Center[J]. Building Structure,2014,44(18):18-21(in Chinese)
[5]田淑明,聂建国.在抗震设计中带加强层框架-核心筒混合结构合理刚度的评价[J].建筑结构,2013,43(12):9-14Tian Shu-ming,Nie Jian-guo. Assessment of reasonable stiffness for frame concrete corewall hybrid structure with strengthed story in seismic design[J]. Building Structure,2013,43(12):9-14(in Chinese)
[6]卢啸,陆新征,等.特大地震下超高层建筑的倒塌模拟[J].中国科学:技术科学,2011,41(11):1405-1416Lu X,Lu X Z,et al. Collapse simulation of a super high-rise building subjected to extremely strong earthquake[J].Sci China Tech Sci,2011,41(11):1405-1416(in Chinese)