界面脱空缺陷对方钢管混凝土柱轴压性能的影响  

Axial compression performance of concrete-filled square steel tubular column with interface defect

作　　者：闫翔宇 郭家逸[2] 张浩泽 陈志华 YAN Xiangyu;GUO Jiayi;ZHANG Haoze;CHEN Zhihua(Institute of Marine Energy and Intelligent Construction,Tianjin University of Technology,Tianjin 300384,China;School of Civil Engineering,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津理工大学海洋能源与智能建设研究院,天津300384 [2]天津大学建筑工程学院,天津300072

出　　处：《福州大学学报(自然科学版)》2025年第1期94-102,共9页Journal of Fuzhou University(Natural Science Edition)

基　　金：国家重点研发计划资助项目(2019YFD1101005)。

摘　　要：为探究界面脱空缺陷对方钢管混凝土柱轴压性能的影响规律,开展24根无缺陷与不同缺陷类型、不同缺陷尺寸和位置的方钢管混凝土柱轴压试验比较,由此得到相应破坏形态和荷载位移曲线,并分析试验过程中试件的受力情况、破坏模式和缺陷对轴压承载力的影响.在模型可靠性得到验证的基础上,参数化分析界面脱空率、缺陷位置、混凝土强度等级等对方钢管混凝土柱轴压性能的影响.结果表明,界面脱空会降低构件的极限承载力,降低程度与脱空率、脱空类型、脱空位置有关.单侧高度方向贯通缺陷脱空率小于5.00%时,极限承载力损失小于5.00%.高强度混凝土可提高构件的极限承载力,但可能导致承载力损失程度变大.环向脱空和单侧均匀脱空会对构件的承载力产生较大影响,承载力平均下降13.30%.长方体孔洞脱空较半圆柱体孔洞脱空对构件的承载力影响更大,脱空率均为5.00%时,两种构件的轴压承载力相差约2.00%.In order to explore the influence of interface voiding defects on the axial compressive properties of concrete-filled square steel tubular columns,24 axial compression tests were carried out with different defect types,different defect sizes,locations or without defects.The failure modes and load displacement curves were obtained.The bearing conditions,failure modes of the specimens and the imperfection influences on the axial compressive bearing capacity were analyzed.Based on the verification of the reliability of the model,the effects of interface voiding rate,defect location,concrete strength grade and other influences on the axial compressive properties of concrete-filled square steel tubular columns were conducted.The results indicate that interface voids reduce the ultimate bearing capacity of the components,and the reduction is related to the void ratio,void type,and void position.When the unilateral height direction through-hole void ratio is less than 5.00%,the loss of ultimate bearing capacity is less than 5.00%.High-strength concrete can improve the load-bearing performance of the components,but it may lead to a larger load-bearing capacity loss ratio.The presence of circumferential voids and unilateral uniform voids has a significant impact on the bearing capacity of the components,with an average decrease of 13.30%in bearing capacity.Rectangular voids have a greater impact on the bearing capacity of the components compared to cylindrical voids,with a difference of approximately 2.00%when the void ratio is 5.00%.

关 键 词：方钢管混凝土柱 界面脱空 脱空率 破坏模式 有限元模型 

分 类 号：TU398.9[建筑科学—结构工程] TU317