Crack Initiation And Propagation Simulation Of Concrete Bridge Deck Pavement Based On Peridynamic

As the bridge is usually exposed to rain and sunshine in nature and carrying increasing traffic loads, the stress state of bridge deck pavement is very complex. However, the bridge deck pavement is not calculated separately in the common design of bridge, which make the bridge deck pavement usually cracked during its designed lifetime. In addition to the designers pay insufficient attention to the bridge deck pavement as it is an affiliated facility, the main reason is that the crack initiation and propagation rules of bridge deck pavement are not deeply investigated and understood. So it is important to find a new numerical calculation method to simulate the crack initiation and propagation of the bridge deck pavement structures. Integral form of displacement function was used to build movement equations in peridynamics, in which the interaction function contains material failures and damages naturally, and thus additional judgment criteria are not needed for the simulation of crack propagation. We use peridynamics to simulate the crack propagation process of the concrete bridge deck pavement due to its advantages on solving discontinuous problems. The main research work and results are as follows:1,Basic theory and numerical method of peridynamic method was explained firstly.2,Concrete constitutive was introduced to peridynamics to establish concrete PD model. FORTRAN computer program was implemented according to the calculation system of peridynamics. Then two examples(cantilever beam and simply supported beam) are used to analyze the mechanical performance and failure process under static and temperature load through PD model of concrete compared. The results are compared with analytical solution and finite element solutions. The comparison results show three facts:1)the limit cracking load of concrete beam is the same as the analytical solution, 2)the displacement results are consistent with the finite element solution, 3)the cracking position and failure mode are roughly the same as experimental results of related literature. The results demonstrates that the PD model is effective and accurate.3, Local model of concrete bridge deck pavement based on PD was used to analyze the main influence factors of surface crack propagation for bridge deck pavement and simulate crack propagation process and failure mode of bridge deck pavement which contains many cracks. Analysis results show that the critical stress value of crack propagation increases with the initial crack length decreases, and the inclination angle and crack spacing increase. For bridge deck pavement which contains many cracks, the cracks cooperate with each other when crack propagate. PD can simulate the crack propagation process of multiple factors combined action accurately and reliably.