Research On Dynamic Characteristics And Failure Simulation For Lofty Intake Built In The Bank

Based on the platform of ABAQUS, this paper finished the whole 3D FE-model of a lofty intake built in the bank. It used concrete damage-plasticity model and linear-elasticty model respectively, got the intake's stress and deformation when it undertakes the loads of dead weight, hydraulic pressure and uplift pressure etc. Futhermore, by submodel technique, more detailed to disscuss the cracking-softing of concrete and the phenomena of stress re-distribution around flow channel of the intake etc, also including the effect that rebar resists the cracking of concrete. On the other hand, this paper finished the analysis of the structure's dynamic behavior, evaluated it's performance of earthquake-resistance, disscussed the influence of added mass method for hydrodynamic pressure and the height of fill concrete in free vibration characteristic, and proposed special measure for seismic design. Main content are list as below:1.Considering the difference of rock-layer's lithology along depth, this paper completed the analysis of stress and deformation of the intake when it is in the state of builted-up and operation. The result shows that it has enough stiffness and strength. At the same time, in order to reflect the mechanical behavior of concrete, it compared the influence between concrete damage-plasticity model and linear-elasticty model for stress and deformation in flow channel of the intake.2. Adapting submodel technique, the paper specially discussed the cracking of concrete at top and bottom of flow channel. The facts prove that it can not only improve the solution precision for simulation of critical part of the structure, but also decrease DOF and time of solution. It is useful in nonlinear analysis.3. This paper completed the analysis of characteristic vibariation. All results by simulation calculation show that the method of added-mass representing hydrodynamic pressure and fill concrete on the back of the intake have large effect on dynamic property. It evaluated the performance of seismic design, and provided the measure to improve the whole structure's torsional oscillation and water screen structure's alone-vibariation for seismic design.