Finite element analysis of flexural behavior of different fiber reinforced ultra-high-strength concrete beam under different environments

In this paper, finite element simulation of ANSYS was carried out to study initial crack load, ultimate load and load-deflection relationship of ultra-high-strength concrete beam with different ratio of steel fiber and PVA fiberunder general environment and corrosive environment respectively. The results show that with the increase of the content of steel fiber, the initial crack load and ultimate load of ultra-high-strength concrete beam are increasing; and with the increase of fiber content, the toughness of the beam is improved; with the increase of the content of PVA fiber, the initial crack load and ultimate load of ultra-high-strength concrete beam increase first and then decrease. The incorporation of the two kind of fibers increases the toughness of the beam to a certain extent and limits the occurrence and development of the crack. When steel fiber mixing rate was 3% in common environment, initial crack load and ultimate load is increased by 155.4% and 7.0% compared with HSC beam, respectively. When PVA fiber mixing rate was 0.5% in the case of easy corrosion, initial crack load and ultimate load is increased by 56.6% and 3.7% compared with HSC beam, respectively, which can effectively improve the flexural performance of the ultra high strength concrete beams.