钢混组合梁栓钉锈胀下混凝土板开裂行为数值分析  

Numerical analysis on cracking behavior of concrete slab due to corrosion expansion of stud connector in steel-concrete composite beam

作　　者：肖林[1] 魏欢博 卫星[1] 康志锐 XIAO Lin;WEI Huan-bo;WEI Xing;KANG Zhi-rui(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学土木工程学院,成都610031

出　　处：《吉林大学学报（工学版）》2024年第7期1958-1965,共8页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(52078424,52178170);广西重点研发计划(桂科AB23026124).

摘　　要：为研究腐蚀环境中钢-混组合梁栓钉锈胀引发的混凝土板开裂行为,本文利用ABAQUS有限元分析软件建立混凝土板塑性损伤模型。采用环向均匀位移模拟栓钉锈胀作用,选用基于牵引力-分离法则(Traction-separation law)的粘聚区模型模拟混凝土开裂,计算分析3种不同约束边界、4种不同栓钉间距及4种栓钉直径条件下,混凝土板锈胀应力分布及开裂行为。研究结果表明:随着边界约束的增加,栓钉需要更大的腐蚀深度才会引起混凝土板开裂。栓钉横向间距从50 cm增加到80 cm,使混凝土边缘开裂需要锈蚀深度增加到1.59倍。栓钉直径从16 mm增加到25 mm,使混凝土边缘开裂需要锈蚀深度减小到0.87倍。In the long-term service of steel-concrete composite beams,due to the carbonization of concrete and the intrusion of chloride ions,the passive film on the surface of the stud connectors is destroyed,and the studs will rust.The corrosion expansion of the stud connector will cause the cracking of the concrete slab,which will seriously affect the durability and safety of the steel-concrete composite structure.In order to study the cracking behavior of concrete slab in steel-concrete composite beams caused by the corrosion expansion of stud connector in corrosive environment,the plastic damage model of concrete slabs were established by using ABAQUS finite element analysis software in this paper.The uniform radial displacement of the stud hole is used to simulate the corrosion expansion of the stud,and the cohesion zone model based on the traction-separation law is used to simulate the concrete cracking.Considering 3 different constraint boundaries,4 different stud spacing and 4 different stud diameters,the corrosion expansion stress distribution and cracking behavior of concrete slabs were investigated.The research results show that,with the increase of boundary constraints,concrete slab will be cracked due to the larger corrosion depth of the studs.The transverse spacing is increased from 50 cm to 80 cm,and the corrosion depth required for concrete edge cracking is increased to 1.59 times.When the diameter of stud increases from 16 mm to 25 mm,the corrosion depth required for concrete edge cracking decreases to 0.87 times.

关 键 词：桥梁工程 栓钉连接件 锈胀 混凝土板 开裂 数值分析 

分 类 号：TU398.9[建筑科学—结构工程]