摘要
提出一种装配式核心钢管混凝土(PCSTRC)柱建造技术,实现混合框架结构的柱-柱快速拼装,并完成4个足尺框架柱试件的单向轴压试验,包含1个整浇RC柱、1个整浇核心钢管混凝土(CSTRC)柱和2个PCSTRC柱试件。最后,在受力分析的基础上,提出PCSTRC柱的轴向荷载-变形曲线理论模型。研究结果表明:整浇CSTRC柱轴压承载力和极限变形相对整浇RC柱分别提高27.6%和25.6%。PCSTRC柱承载力高于整浇RC柱且随核心钢管配钢率增加而增加,最大提高21.7%;PCSTRC柱的极限变形比整浇RC柱最大提高了29.2%,但轴压刚度略低于整浇试件;在相同核心钢管配钢率下,PCSTRC柱轴压承载力比整浇CSTRC柱降低15.7%,极限轴向变形基本相同;PCSTRC柱整个轴压受力过程分为弹性、塑性发展和承载力衰减3个阶段;弹性和塑性发展阶段可忽略套管约束作用,按照普通CSTRC柱进行设计;承载力衰减阶段应考虑套管对核心钢管混凝土部分的附加约束作用进行残余承载力计算。
A prefabricated core steel tube reinforced concrete(PCSTRC) column was proposed to achieve rapid assembly for columns of hybrid frame structures. Four full-scaled specimens, including one monolithic RC column, one monolithic core steel tube reinforced concrete(CSTRC) column and two PCSTRC columns, were tested under monotonic axial compression. A theoretical model between the axial compression load and deformation response of PCSTRC columns was finally proposed based on the analysis of the axial load bearing mechanism. The research results show that the axial compression capacity and the ultimate axial deformation capacity of the monolithic CSTRC column increase by 27.6% and 25.6%, respectively, compared with those of the monolithic RC column. The axial compression capacity of the prefabricated columns is higher than that of the monolithic RC column and increases with the increase of steel ratio of the core steel tube. Compared with the RC column, the maximum increase ratio of the axial compression capacity of the PCSTRC columns is 21.7%. The maximum ultimate axial deformation capacity of the PCSTRC columns is 29.2% higher than that of the RC column, while the axial stiffness of PCSTRC columns is slightly lower. The axial compression capacity of the PCSTRC column decreases by 15.7% compared with the monolithic CSTRC column with the same steel ratio of core steel tube, while the ultimate axial deformation capacity of both columns is almost the same. There are three phases during the whole monotonic axial loading process, which are the elastic phase, plastic deformation developing phase and degradation phase. The confinement of the splicing steel tube to the core steel tube could be neglected during the first two phases and the PCSTRC columns can be designed following the ordinary CSTRC columns. However, this confinement has to be considered into calculation the residual load carrying capacity at the third phase.
作者
刘阳
王超
郭子雄
王品治
许一鹏
LIU Yang;WANG Chao;GUO Zixiong;WANG Pinzhi;XU Yipeng(College of Civil Engineering Huaqiao University,Xiamen 361021,China;Key Laboratory for Structural Engineering and Disaster Prevention of Fujian Province,Huaqiao University,Xiamen 361021,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2019年第12期3127-3136,共10页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(51878304
51578254)::福建省科技重大专项基金资助项目(2019HZ07011)::福建省自然科学基金资助项目(2018J01074)~~
关键词
装配式结构
核心钢管混凝土柱
轴压性能
试验研究
受力机理
prefabricated structures
core steel tube reinforced concrete
axial compression performance
experimental study
loading bearing mechanism
