Reinforced Mechanism and Cracking Strength Study of Fiber Concrete Based on Spacing Theory

摘要

For fiber reinforced concrete in which the fiber is continuous uniform distribution, the elastic interface stress is analyzed by selecting single fiber. The stress distribution of single fiber is an exponential function. According to the theory of fiber spacing, considering the coupling effect of multiple fibers, the multiple fibers stress can be got by superposition the sigle fiber stress in same site. The minimum resultant stress is regarded as the fiber reinforced stress, and the site of minimum resultant stress is the most dangerous point of fiber concrete member. After known the fiber stress, according to balance equation for member, the stress relationship between concrete matrix and member can be obtained. Assumed the concrete stress gets to the cracking stress, the cracking load of member can be calculated. The value of cracking load calculated by proposed formula is compared with the test results. The theoretical calculation value and test results are in good conformity.