Numerical Simulation Of The Fiber Pulled Out From Steel-fiber Concrete

Steel fiber reinforced concrete material is widely used in bridges, buildings, and water conservancy engineering environment because of its excellent mechanical properties, the study of mechanical properties of steel fiber reinforced concrete is inevitable demand of modern industrial development. The interfacial debonding slip model is the mechanical properties of steel fiber reinforced concrete core content. It is difficult to study the mechanical properties just through experimenta. Without considering concrete the damage of concrete, this paper used ANS YS software and the finite-element method to analyze the process of steel fiber pull-out from the concrete matrix, and provides a basis for the study on fracture toughness of steel fiber reinforced concrete.First of all, this paper established the finite element model of flat steel fiber concrete. In order to consider the effects of fiber properties and concrete interface layer, interface layer is arranged on the fiber and concrete bonding between fiber and concrete, simulated by node coupling and coupling and deboning of the role, the interfacial shear stress strength criterion as the basis for judging the debonding of fibers, the flat steel fiber pull-out process simulation of concrete, and comparison with experimental results. Study on the influence of diameter of fiber, interfacial elastic modulus and fiber buried depth for the stress distribution on the interface. It analyses the interfacial shear strength of residual stress, interfacial elastic modulus and interfacial shear stress influence on the straight fiber pull-out characteristic.Second, this paper used the contact element to simulate contact interface of fiber and concrete, ignoring the effect of concrete matrix damage, considering plastic deformation of fibers, studied on the hooked-end steel fiber pull-out of concrete process, and compared with test results. It discussed the interface friction coefficient, elastic modulus of matrix, the tensile strength of steel fiber and concrete shrinkage characteristics effecting on the pull-out process of fibers.Finally, this paper shows fiber pull-out energy consumption by displacement load curves of fibers. It discusses the hook-end fibers’ pull-out energy with different embedding angles and sizes make reasonable anticipation to hook-end fibers’ pull-out energy.