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