Anti-seismic Optimal Design Of Concrete Gravity Dam

Concrete gravity dam has many advantages such as security, simplicity of design and construction, better applicability to terrain and geology condition and can easily solve difficulties caused by construction diversion and permanent flood discharge, etc. It is the predominant dam type used in practical engineering presently in China. However, the designing principles used to control construction quantity and reliability of the gravity dam was mainly based on experiences.China is a country with frequent earthquake, concrete gravity dam unavoidably subject to seismic operation, but passive control method is the major means to be used to protect earthquake-resistance of structures in the present, optimization is irregularly used. As the increasing of dam height, it appears especially more importance to develop and apply optimization under the static and dynamic situation at the same time.Finite element method, which was developed in 1950s, is an efficient tool for complex structural analysis and had got satisfactory effects in the dam analysis. Genetic algorithm, a method which can search optimum solution intelligently and globally, has developed rapidly. This paper introduces base theory of genetic algorithm specific application in large hydraulic architecture, associated with finite element method.In this paper, binding practice, the mode of concrete gravity dam for anti-seismic optimal design is built and the stress and seismic response of the 5th monolith of a concrete gravity dam are analyzed using finite element method. The dam's figure is optimized by genetic algorithm, which is improved by judging whether the new object function is improved in first time ,then verifying whether the geometric restrain conditions meet the requirement, in the end, checking the character restrain whether meet the requirement. The optimal result, compared with material mechanics method optimal result, testified this method is appropriate and the result is reliable. The optimized figure is more perfect in volume, stress target and anti-seismic ability than the first figure. This optimal result was recommended to design institute and the anti-seismic optimal design method of concrete gravity dam, created in this paper, has good practicability in engineering.