非对称十字形配钢SRC柱地震损伤特征分析  

Analysis of Seismic Damage Characteristics of SRC Column with Asymmetric Cross-Shaped Steel

作　　者：许晓梁 吴琛[2] XU Xiaoliang;WU Chen(Tongji Architectural Design(Group)Co.,Ltd.,Shanghai 200092,China;Fujian Provincial Key Laboratory of Advanced Technology and Informatization in Civil Engineering,Fujian University of Technology,Fuzhou 350118,China)

机构地区：[1]同济大学建筑设计研究院(集团)有限公司,上海200092 [2]福建工程学院,福建省土木工程新技术与信息化重点实验室,福州350118

出　　处：《结构工程师》2022年第1期85-92,共8页Structural Engineers

基　　金：国家自然科学基金项目(51108083);福建省高校产学合作重点课题(2019Y4011);同济设计集团工程技术类自主立项课题(2020J-JZ08)。

摘　　要：为避免型钢混凝土(SRC)结构在节点处的大量钢筋焊接作业和钢筋穿孔削弱柱型钢截面强度,提出一种非对称十字形配钢SRC柱的构造形式。考虑钢材对混凝土的约束作用,完成了九组SRC柱在低周往复加载下的有限元模拟。以混凝土受压损伤云图表征混凝土损伤演化特征,以累积损伤应变云图反映型钢的损伤分布。研究表明:相同含钢率下,非对称十字形配钢SRC柱与传统对称十字形配钢方式具有相近的承载力,且损伤分布呈现不对称性。在型钢内缩一侧,混凝土的损伤程度和范围均大于型钢未内缩一侧,而型钢则是未内缩一侧的损伤较为严重,并表现出弯曲型、弯剪型和剪切型三种损伤模式。A construction form of Steel Reinforced Concrete(SRC)column with asymmetric cross-shaped steel is proposed to avoid weakening of the column section strength due to massive steel welding work and steel perforation at the joints.Considering the constraint effect of steel on concrete,finite element simulation of nine groups of SRC columns under cyclic loading is completed.The damage evolution characteristics of concrete are represented by the concrete compressive damage nephogram,and the damage distribution of steel is reflected by the accumulated damage strain nephogram.The results show that with the same steel content,the SRC column with asymmetric cross-shaped steel has similar bearing capacity as the traditional symmetric steel,and the damage distribution shows asymmetry.The degree and scope of concrete damage on the receding side of the section steel are greater than that on the other side,while the damage on the un-receding side of the section steel is serious.Three damage modes of bending,bending&shearing and shearing are exhibited.

关 键 词：非对称十字形配钢SRC柱 混凝土受压损伤 型钢累积损伤应变 损伤模式 

分 类 号：TU398.9[建筑科学—结构工程] TU312.3