The System Reliability Of Arc Dam

With the development of computer technology, the calculation of arc dam is more accurate. But the development of precision in calculation is not ultimate intention. All in all, the development of the precision in calculation is served to grasp the safety of arc dam as a whole. If not have a proper method to calculate the safety of arc dam, the development of precision in calculation will have no significance. The arc dam is a kind of superior pattern of dam. The system reliability of arc dam can reflect the integral safety of arc dam very well. This is important to raise the safety of dam and to defend the people's life and asset.The system reliability of arc dam is an important part in the study of reliability. The study in reliability of arc dam principally has more concentration on the study of the intensity reliability of the arm's body and the study of the stability reliability of the dam's base. But has little concentration on the study of the system reliability of arc dam. How to incorporate the reliability of dam's body with the reliability of dam's base is a high direction in the reliability study of arc dam in future.In this article,the system reliability of arc dam is mostly discussed. First, simply introduce the methods of calculation in the reliability. And introduce the rationale and the course of the calculation of the stress and the stability of arm's base in fixed value as a rule. Also assay the stress and the stability of arm's base in fixed value with a great finite element method. Second, combine with the certain number method and the theory of reliability. Also take the stochastic peculiarity of variable into account. Through the SFEM establish the relationship of loading effect(such as stress,internal force,etc) and random variable. Final compile the SFEM program. Third, assay the intensity reliability of arm's body and the stability reliability of arm's base which take the crack surface into account with this SFEM program. Also calculate the index of corresponding reliability.In the end, the index of the intensity reliability of arm's body and the stability reliability of arm's base which take the crack surface into account is calculated. Assay the change tendency in the two circumstance. Then obtain the influence of the crack surface on the reliability index. Calculate the integral reliability of dam's body in two circumstance by means of step-by-step method. Assay the influence of the crack surface on the integration reliability of dam's body. Then starting from the reliability of the arm's body and the stability, look the destruction of pull force and the destruction of pressure and the losing of stability as three failure modes. Look all the destructions of pull force in the dam's body as failure elements of the destructions of pull force failure mode, as well as the destruction of pressure and the losing of stability. The failure modes are serial each other. But the failure elements in the same failure mode are multiple. At last, obtain the system reliability of arc dam. To find out a method to calculate the system reliability of arc dam. And calculate it in two circumstance. Assay the influence of the crack surface on the system reliability of arc dam. In the end, obtain some useful conclusion.