Impact Factors Analysis On The Crack Width Of Reinforced Concrete Beams

Crack width of reinforced concrete structure is an important indicator of structural performance. The main factors of bending crack width of reinforced concrete beam are analyzed and discussed in this paper.Both experimental study and finite element analysis are used in this paper. The author has made twelve ordinary rectangular cross-section reinforced concrete beams with net span 1800mm. There are designed to three kinds of reinforcement ratio, and three of each kind are loaded to the elected crack, and the other one is used as the base beam (all beams are loaded at one-third point). The experimental analysis is mainly on the impact of load, steel stress and other factors to the crack width. The finite element is mainly used for calculating the stripping area length and comparing it with the test, and finally analyzing on the impact factors of crack width. Finally, it mainly takes the following conclusions:Firstly, for ordinary reinforced concrete beams, tensile steel stress is the main factor affecting crack width. Testing and analysis show that under the same crack width, the steel stress of cracking section are same, and what is more, crack width and steel stress increase is linear.Secondly, on both sides of the cracks, there are stripping areas in the interface of steel and concrete. The stripping length is directly related to the steel stress, and the calculations show that under the same crack width, the stripping lengths are same.