工字形CFRP-高强圆钢管高强混凝土中长柱偏心受压性能研究  

Mechanical Behavior of I-shaped CFRP Profiles-high-strength Concrete-filled High-strength Circular Steel Tube Middle-Long Columns under Eccentric Loading

作　　者：李帼昌[1] 王宁波 李晓 LI Guochang;WANG Ningbo;LI Xiao(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2024年第6期961-972,共12页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金重点项目(51938009)。

摘　　要：目的为避免材料浪费,减小构件截面尺寸,将CFRP型材与高强圆钢管高强混凝土进行结合,形成工字形CFRP型材-高强圆钢管高强混凝土构件,并研究其在偏心受压状态下的力学性能。方法采用试验和有限元相结合的方法对组合构件的工作机理和破坏模态进行研究,选取典型构件进行受力全过程以及变参数分析。结果典型构件荷载-挠度曲线可分为弹性段、弹塑性段、塑性强化段和下降段;CFRP型材在弹塑性段后承担荷载比例逐渐增加且能够与钢管协同工作,对混凝土形成双重约束,提高构件的极限承载力;长细比、偏心率对构件的极限承载力、初始刚度、延性影响较为明显,钢材屈服强度、混凝土强度、含钢率、CFRP配置率影响较小。结论试件受力过程中变形较为稳定,延性较好,试件的变形符合平截面假定。To avoid material waste and reduce the section size of the member,CFRP profiles and high-strength concrete-filled high-strength circular steel tube is combined to form I-shaped CFRP profiles-high-strength concrete-filled high-strength circular steel tube,and their mechanical performance under eccentric compression are studied.The working mechanism and failure mode of the composite members were studied by the combination of test and finite element method.The typical members were selected for the whole process analysis and variable parameter analysis.The results showed that the load-deflection curve of typical members can be divided into an elastic section,elastic-plastic section,plastic strengthening section,and descending section.The proportion of load borne by CFRP profiles after the elastic-plastic section gradually increases and can work together with the steel tube,forming double constraints on the concrete and improving the ultimate bearing capacity of the members.The slenderness ratio and eccentricity have an obvious influence on the ultimate bearing capacity,initial stiffness,and ductility of the members,while the steel yield strength,concrete strength,steel ratio,and CFRP configuration rate have little influence.The deformation of the specimen is stable and the ductility is good,and the deformation of the specimen conforms to the plane section assumption.

关 键 词：工字形CFRP型材 高强圆钢管 高强混凝土 偏心受压 

分 类 号：TU398.1[建筑科学—结构工程]