【作者】 黄耀英；

【导师】 吴中如；

【作者基本信息】 河海大学 ， 水工结构工程， 2003， 硕士

【摘要】 混凝土坝接缝问题本质上属于接触问题。本文应用接触模型对具有结构缝的混凝土坝在地震荷载作用下的非线性地震响应进行了研究，以期得到该混凝土坝在地震荷载作用下较合理的位移与应力状态。主要研究内容如下： 1、研究分析了混凝土坝接缝的类型、常用结构分析的三种接缝模型——连续介质模型、不连续介质模型和接触模型；同时探讨了接触问题的三种计算方法——拉格朗日乘子法、罚函数法和基于求解器的直接约束法；此外，研究了目前国际上著名的大型非线性有限元软件。 2、对混凝土坝接缝的结构行为进行了研究，论述了接缝的力学概念、模拟精度较高的接触模型的有限元方程、计算方法和分析过程。通过考题的验证，表明了本文所采用模型的可行性和合理性。 3、研究了几种常用的动力分析方法，探讨了工程上常用的两种对动水压力分析的方法——按有限元计算的方法和按广义Westergaard公式计算的方法，在此基础上，结合实例论证了计算的正确性。 4、结合龙羊峡重力拱坝，分析了该大坝的动力特性、关键部位的应力和位移量值及其变化过程；并通过大量的分析计算，比较了水工结构中横缝对坝体地震响应的影响；与此同时，分析了该大坝的横缝在不同方向地震荷载作用下的动力行为，取得了一些有参考价值的结论。更多还原

【Abstract】 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.更多还原