局部锈蚀对偏心受压圆钢管混凝土构件性能的影响研究  

Research on Local Corrosion Effects on Mechanical Properties of Concrete-Filled Circular Steel Tubes Under Eccentric Compression

作　　者：张雨晨 郭现钊 张晨明 张磊 陈广锐 张素梅 ZHANG Yuchen;GUO Xianzhao;ZHANG Chenming;ZHANG Lei;CHEN Guangrui;ZHANG Sumei(School of Civil and Environmental Engineering,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China;China Railway Design Group Co.,Ltd.,Tianjin 300142,China)

机构地区：[1]哈尔滨工业大学(深圳)土木与环境工程学院,广东深圳518055 [2]中国铁路设计集团有限公司,天津300142

出　　处：《工业建筑》2023年第9期69-77,共9页Industrial Construction

基　　金：国家自然科学基金项目(51778185);中国铁路设计集团有限公司科技项目(2018-029)。

摘　　要：对18个圆钢管混凝土试件进行了锈蚀试验和锈蚀后构件的偏心受压试验。采用通电加速金属锈蚀的方式,得到具有不同锈蚀程度的圆钢管混凝土试件。对锈蚀后构件进行了偏压性能试验,探究了局部锈蚀对圆钢管混凝土柱力学性能的影响。通过ABAQUS有限元程序建立了局部均匀锈蚀、宏观不均匀锈蚀和微观不均匀锈蚀的圆钢管混凝土偏心受压柱的理论分析模型,提出了考虑钢管局部锈蚀的圆钢管混凝土柱有限元建模方法建议。研究结果表明:局部锈蚀的圆钢管混凝土长柱试件在偏压试验中均发生截面压溃破坏。试件的极限承载力会随着锈蚀率、环向锈蚀率、偏心率以及长细比的增大而降低;相较于未锈蚀试件,当试件几何参数和锈蚀区域相同,锈蚀率增大到20.00%时,试件极限承载力降低11.70%。建立局部锈蚀的圆钢管混凝土有限元模型时,建议根据钢管表面锈蚀形貌选择不同锈蚀模型。18 specimens of concrete-filled circular steel tubular long columns were tested for corrosion and subsequently subjected to eccentric compression.The specimens with different corrosion degrees were obtained by accelerated corrosion of electricity.After the corrosion,eccentric compression tests were carried out to explore the effects of local corrosion on the mechanical properties of the circular concrete-filled steel tubes.Three theoretical analysis models of locally corroded circular concrete-filled steel tubes under eccentric compression were established by ABAQUS finite element program,including uniform corrosion,macro uneven corrosion and micro uneven corrosion,which provided references for the locally-corroded concrete-filled circular steel tubular models.The results showed that the locally-corroded concrete-filled circular steel tubes suffered cross-section crush failure.The ultimate bearing capacity decreased with the increase of corrosion rate,circumferential corrosion rate,eccentricity and slenderness ratio.Compared with the uncorroded specimens,when the geometric parameters were the same as the corrosion area,and the corrosion rate increased to 20.00%,the ultimate bearing capacity decreased by 11.70%.When establishing a finite element model of locally-corroded concrete-filled circular steel tube,it was recommended to select different corrosion models according to the surfaces of the corroded steel tubes.

关 键 词：局部锈蚀 钢管混凝土 偏心受压 极限承载力 有限元分析 

分 类 号：TU398.9[建筑科学—结构工程]