内置型钢圆形截面不锈钢管混凝土柱滞回性能研究  

Hysteresis behaviours of circular steel reinforced concrete-filled stainless steel tubular columns

作　　者：王志滨[1] 黄书恬 彭桂瀚[1] 林万福 李鑫雷 WANG Zhibin;HUANG Shutian;PENG Guihan;LIN Wanfu;LI Xinlei(College of Civil Engineering,Fuzhou University,Fuzhou 350108,China;Fujian Lugang(Group)Co.,Ltd,Quanzhou 362000,China)

机构地区：[1]福州大学土木工程学院,福建福州350108 [2]福建路港(集团)有限公司,福建泉州362000

出　　处：《建筑结构学报》2024年第12期97-110,共14页Journal of Building Structures

基　　金：国家自然科学基金项目(52178122);泉州市科技计划(2021C015R);广东省普通高校特色创新类项目(2022KTSCX246)。

摘　　要：为研究内置型钢圆形截面不锈钢管混凝土柱的滞回性能,进行了6根内置型钢圆形截面不锈钢管混凝土柱和3根圆形截面不锈钢管混凝土柱的滞回试验,主要参数为轴压比。试验结果表明:内置型钢圆形截面不锈钢管混凝土柱的破坏模态均为压弯破坏,表现为钢管局部屈曲、型钢局部屈曲和混凝土压碎等,轴压比较小时,其不锈钢管还被拉裂;与圆形不锈钢管混凝土柱相比,其峰值荷载、位移延性系数、等效黏滞阻尼系数、累积耗能和抗弯刚度分别平均提高了34.2%、10.3%、20.4%、144.8%和3.0%。建立了该类组合柱的有限元模型,基于验证的有限元模型开展了参数分析,结果表明,构件的峰值荷载随着内置型钢含钢率、不锈钢管截面含钢率、型钢屈服强度、不锈钢屈服强度、混凝土强度以及型钢截面回转半径的增大而增大,但随着长细比及轴压比的增大而减小。建议了该类组合柱的P-Δ恢复力模型,其计算结果与试验结果吻合较好。In this paper,the hysteresis tests of six circular steel reinforced concrete-filled stainless steel tubular(SRCFSST)columns and three circular concrete-filled stainless steel tubular(CFSST)columns were carried out to study the hysteresis behaviors of SRCFSST columns.The main parameter investigated in the tests was the axial load ratio.The tests reveal that the typical damage mode of circular SRCFSST columns is compression-bending damage,including profiled steel buckling,steel tube buckling,and concrete crushing.When the axial load ratio is relatively low,the stainless steel tube can be subjected to tensile rupture.Compared to circular stainless steel tubular concrete specimens,the peak load,displacement ductility coefficient,equivalent damping ratio,cumulative energy dissipation,and flexural stiffness of steel reinforced concrete-filled stainless steel tubular columns improve by an average of 34.2%,10.3%,20.4%,144.8%,and 3.0%,respectively.The composite column was simulated using a finite element(FE)model,and a parametric study was conducted using the verified FE model.The parametric study show that the ultimate load-carrying capacity of the columns increases with higher steel content ratio of the internal steel section,higher steel content ratio of the stainless steel tube section,higher yield strength of the steel section,higher yield strength of the stainless steel,higher concrete strength,and larger radius of gyration of the steel section.However,it also found that the peak load decreases with the increasing slenderness ratio and axial load ratio.Finally,the P-Δrestoring force model of the composite column was recommended,and it is shown that the P-Δrestoring force model can accurately predict test results.

关 键 词：圆形不锈钢管混凝土 内置型钢 滞回试验 有限元模型 恢复力模型 

分 类 号：TU398.9[建筑科学—结构工程] TU317.1