Crack is a common quality problem in the construction of high-speed railway bridges,which seriously affects the structural performance and service life of bridges.In order to reduce the probability of cracks in the construction process of high-speed railway bridges and improve the crack resistance performance of bridge structures,this paper analyzes the causes of cracks in bridge concrete structures from the aspects of design,concrete shrinkage,and load,and studies the influence of fibers on the crack resistance of concrete.It is found that by adding fibers,the number of cracks in concrete can be significantly reduced and the crack resistance can be improved.When different types of fibers are added to concrete,the crack resistance effect is obviously different,among which modified polypropylene fibers have the best effect.By adding fibers to concrete,the plastic shrinkage stress of concrete can be reduced and the time when the peak value of plastic shrinkage stress occurs can be delayed.
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