The Seismic Response Analysis Of Concrete Dam's Joint

The concrete dam's joint problem essentially belongs to contact problem. Nonlinear response of concrete dam containing construction joints to earthquake excitations were carried out with contact model in this paper, in order to obtain the concrete dam's actual displacement and stress status. The main contents are as follows:1.The concrete dam's joint types were analyzed. Then continuous medium model, discontinuous medium model and contact model which are joint models commonly used in structure analysis were reviewed. The FEM calculate method for contact problem, i.e. LAGRANGE multipliers, penalty methods and direct constrains were discussed. At the same time, studied the famous nonlinear FEM software.2.The structure behavior of concrete dam's joint was studied. The joint's mechanics conception was dissertated, the contact model's FEM equation, calculated method and analysis course were also dissertated and the model's feasibility and rationality were validated by several examples.3.Several dynamical analysis methods were studied. The two commonly used methods that can analyze the dynamic fluid pressure in the engineering field, i.e., the FEM method and the generalized Westergaard method were discussed. Several examples verified the correctness based on this.4.The dam's dynamical characteristic and pivotal part's displacement and stress were analyzed with the consider of the LONGYANGXIA concrete arch dam. The influence of joint to the concrete dam was analyzed by much calculation. At the same time, the behavior of the dam's joint in different earthquake excitations were analyzed, and a little of valuable results were obtained.