钢管柱-混凝土框架非下插转换节点抗震性能试验研究  

Experimental study on seismic performance of steel-concrete transfer joint without embedding into lower frame

作　　者：高劲洋 聂鑫[1] 丁然[1] 樊健生[1] 范重[2] GAO Jinyang;NIE Xin;DING Ran;FAN Jiansheng;FAN Zhong(Department of Civil Engineering,Tsinghua University,Beijing 100084,China;China Architecture Design&Research Institute,Beijing 100044,China)

机构地区：[1]清华大学土木工程系,北京100084 [2]中国建筑设计研究院,北京100044

出　　处：《建筑结构学报》2023年第2期119-128,共10页Journal of Building Structures

基　　金：国家自然科学基金项目(51890903)。

摘　　要：钢-混凝土竖向混合结构由上部钢结构和下部钢筋混凝土结构组成,通过转换节点实现上下结构的连接和转换。传统节点钢管下插长度大,现场焊接量大,节点域施工困难且不利于施工质量控制。为解决上述问题,在已有研究基础上对钢管柱-混凝土框架转换节点构造进行改进优化,提出钢管柱-混凝土框架非下插转换节点。该节点钢管柱仅下插至节点域,梁底纵筋贯通,混凝土柱纵筋采用间接搭接方式与钢柱连接。制作4个缩尺比1∶2.5的钢管柱-混凝土框架非下插转换节点并进行往复加载试验,对其抗震性能进行研究。试验结果表明:钢管柱-混凝土框架非下插转换节点滞回曲线饱满,耗能能力及延性良好,具有很好的抗震性能;在轴压比为0.05~0.40范围内,增大轴压比可显著提升节点抗震性能,而节点域上部混凝土对抗震性能影响很小;对比分析了钢管柱-混凝土框架非下插转换节点与普通钢管柱-混凝土框架转换节点的承载力、刚度、耗能能力等性能,证明钢管柱-混凝土框架转换节点构造并未削弱其抗震性能,且间接搭接的连接方式传力可靠有效。Steel-concrete vertical hybrid structure is composed of the upper steel structure and the lower reinforced concrete structure. The connection and transformation of the upper and lower structures are realized through the transfer joint. The traditional joint has following limits: steel pipe has a large embedded length, much on-site welding is needed, the construction of joint area is difficult, and the quality is hard to control. To solve the above problems, based on the existing research, this paper improved the details of steel column to concrete frame transfer joint, and proposed a new type of transfer joint. The steel column of the new joint was embedded into the panel zone, and the longitudinal rebars of concrete column were connected with steel column by non-contact lap splices. To study the seismic performance of the new transfer joint, four specimens with 1/2.5 scaling ratio were made and tested under cyclic loading. All the specimens exhibit satisfied seismic performance with plump load-displacement curve, excellent energy dissipation capacity and ductility. Furthermore, in the range of 0.05-0.40, the increase of axial compression ratio shows positive influence on the seismic performance of the joint, while the upper-panel zone concrete has very little influence. Finally, the performance of the new joint and the traditional one were analyzed and compared in terms of capacity, stiffness and energy dissipation, proving that the new joint does not weaken its seismic performance, and the non-contact lap connection was reliable.

关 键 词：混合结构 转换节点 间接搭接 低周反复加载试验 抗震性能 

分 类 号：TU398[建筑科学—结构工程] TU317.1