含可更换剪切型耗能梁段的组合钢框筒性能优势研究

Study on the Performance Advantage of Composite Steel Framed-Tube Structure with Replaceable Shear Links

针对传统框筒结构延性差和震后修复困难的问题,提出了一种新型框筒结构形式——含可更换剪切型耗能梁段的组合钢框筒结构。为了体现这种结构的性能优势,利用SAP2000软件进行了静力弹塑性分析,将其与传统钢框筒结构(1个Q460钢框筒结构和2个Q345钢框筒结构)的承载力、层间位移角、楼层剪力、层刚度、剪力滞后效应、塑性铰分布和用钢量进行了对比,并给出一些设计建议。分析结果表明:该新型结构相对于Q345钢框筒结构可节省用钢量约15.5%;其翼缘框架剪力滞后效应与传统钢框筒结构相差不大;该新型结构的延性系数为1.73,相较于传统钢框筒结构的延性系数可提高26.3%;与传统钢框筒结构相比,该新型结构在中震和大震下可降低地震作用约20.1%和33.6%,并且将结构的塑性变形集中在可更换耗能梁段上,方便震后的识别和替换。在高烈度区,该新型结构的主体抗侧力构件钢材建议采用Q390~Q460,剪切型耗能梁段钢材建议采用LY160~Q345。

To overcome low ductility of traditional framed-tube structure and its difficulty of repairing under severe earthquake,an innovate steel framed-tube structure,namely a composite steel framed-tube structure with replaceable shear links,is presented in this paper.In order to reflect the advantages of structural performance,it is compared with three ordinary steel framed-tube structures(one constructed by Q460 and two constructed by Q345)using the static elastic-plastic analysis by SAP2000 software.The bearing capacity,story drift angle,story shear,story stiffness,shear lag,plastic hinge distribution and usage amount of steel,and some design suggestions are given.The analysis results show that the new structure can save about 15.5%of steel,compared with Q345 steel framed-tube structures.The degree of shear lag of flange frame of the new structure is equivalent to that of common steel framed-tube structures.The ductility coefficient of the new structure reaches 1.73,and it increases 26.3%than that of traditional ones.The new structure can reduce the earthquake action on average about 20.1%and 33.6%under moderate earthquake and rare earthquake,respectively,and it can concentrate plastic deformation of the structure on link,and it is convenient to distinguish and replace damage after earthquake,compared with ordinary steel framed-tube structures.In highly seismic region,Q390~Q460 steel is recommended for lateral resisting members of new structure,and LY160~Q345 steel is recommended for shear links.