Abstract The use of synthetic macro-fibers for the lining of tunnel segments contributes to increasing strength, but creep and cracking of components may occur over time under continuous bending load. With the improvement of ability to deal with cracks, synthetic macro-fiber will be more and more widely applied in the fabrication of tunnel segments by virtue of its superior economical efficiency and durability. Based on the time-dependent characteristics, this paper analyzes and verifies the creep and shrinkage effects of cross section of macro-fiber reinforced concrete under continuous bending moment and axial stress by numerical examples. The results show that fiber in concrete has limited effect on increasing flexural strength of cross section, but it reduces the creep of component during service and significantly decreases the maximum crack width under interaction of fibers and ordinary rebars.
Abstract：
The use of synthetic macro-fibers for the lining of tunnel segments contributes to increasing strength, but creep and cracking of components may occur over time under continuous bending load. With the improvement of ability to deal with cracks, synthetic macro-fiber will be more and more widely applied in the fabrication of tunnel segments by virtue of its superior economical efficiency and durability. Based on the time-dependent characteristics, this paper analyzes and verifies the creep and shrinkage effects of cross section of macro-fiber reinforced concrete under continuous bending moment and axial stress by numerical examples. The results show that fiber in concrete has limited effect on increasing flexural strength of cross section, but it reduces the creep of component during service and significantly decreases the maximum crack width under interaction of fibers and ordinary rebars.
2020, Vol. 57 