Probability distribution and recommended value of impact coefficient on crack width in steel fiber reinforced high-strength concrete beams with high-strength reinforcements
In order to investigated the influence of steel fiber on the maximum crack width of RC beam under normal serviceability states,17 steel fiber reinforced high-strength concrete(SFRC)beams and one reinforced high-strength concrete(RC)beam with high-strength steel bars were investigated by means of flexural experiments.Test results indicate that the maximum crack width of RC beam with high-strength steel bars under bending obviously decreases with the addition of steel fibers,and steel fiber impact coefficient value on the crack width of SFRC beam with high-strength steel bars is greater than that specified in JGJ/T 465-2019"Standard for design of steel fiber concrete structures".The applicability of the impact coefficient of steel fiber in current code of China for the calculation of maximum crack width of SFRC beam with high-strength steel bars,of which the impact coefficient value is used to reflect the influence of steel fiber on the maximum crack width of SFRC beam under bending,is also discussed.The probability distribution of steel fiber impact coefficient on the crack width was analyzed through the experimental data of flexural beams collected from relevant literatures,and the impact coefficient for the different types of steel fibers with various guarantee rates were obtained.Finally,the suggested value of steel fiber impact coefficient on the crack width was proposed to be 0.45.
万方数据
维普
