Crack Width Calculation Method of Reinforced Steel Fiber Concrete Shield Segment

Precast concrete segment is the most commonly used lining structure form of subway shield tunnel. In order to give full play to the advantages of reinforced steel fiber concrete shield segments and obtain an accurate calculation method of crack width, four groups of 18 steel fiber reinforced concrete beam test schemes were designed. Based on the experimental data and the finite element analysis of ABAQUS, the research results show that: (1) Based on the data obtained from the test of bending beam and pure bending beam, the calculation method of crack width of reinforced steel fiber reinforced concrete pure bending and large eccentric compression members is proposed. (2) The influence of steel fiber content and reinforcement ratio on crack width is analyzed by finite element analysis. When the steel fiber content increases, the tensile strength of steel fiber reinforced concrete increases gradually, and the crack width of the component decreases gradually. When the reinforcement ratio increases, the corresponding load when the steel bar reaches the yield strength increases gradually, and the crack width decreases gradually. (3) Through the measured test of shield segment crack width, the crack width calculated by the formula and the Model Code is relatively close to the segment test results, and the average difference is 56% and 50% respectively. (4) The proposed crack width calculation method effectively considers the influence of steel fiber content and reinforcement ratio on crack width. The calculation results are more accurate and can effectively evaluate the crack width calculation of C50 steel fiber reinforced concrete shield segment.