In order to explore the shrinkage characteristics and cracking behavior of high performance concrete under stud restrained,steel-concrete composite components were made,and the effects of different factors of studs on the shrinkage strain,restrained degree and cracking risk of high performance concrete were analyzed through experiments.The effect of stud diameter,spacing and height on restrained shrinkage of high performance concrete was study by orthogonal test,and the main sensitive factors were obtained.The results show that the development trend of restrained shrinkage strain of high performance concrete is smoother than that of ordinary concrete.The sensitivity of each factor to restrained shrinkage is in the order of diameter,spacing and height.The concrete shrinkage presents a certain shrinkage gradient in the height direction,and the restrained shrinkage strain increases with the increase of height.But the stud height changing at 30 mm,spacing changing at 75 mm,diameter changing at 150 mm have little effect on restrained shrinkage.The restrained effect of studs on concrete can be defined as three stages,namely,the restrained enhancement stage,the restrained descent stage and the restrained stability stage.The maximum cracking risk of composite beam members occurs at the root of studs.When the stud spacing decreases from 150 mm to 75 mm,and the diameter increases from 13 mm to 22 mm,the maximum cracking risk increases by 20.03%and 36.05%,respectively.But the change of stud height has no effect on the maximum cracking risk.The shrinkage and cracking risk of concrete can be effectively reduced by using high performance concrete and stud arrangement with small diameter and high height.
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