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To reasonably evaluate the seismic safety of concrete dams,by introducing the ageing degradation function into dynamic damage constitutive model, a method which is used to evaluate the seismic safety of long-term operating concrete dams is proposed,the method can consider the effect of ageing of concrete on the safety assessment of the dam under earthquake load.The ageing damage model also is adopted to evaluate the 1ife of concrete dam.In order to illustrate the application of the model, examplification is given according to the model at the end of the paper.The results show that the effects of ageing damage on the dynamic response of the dam are significant under earthquake load. The nvestigations, in this paper, are not only important improvement for seismic safety evaluation method of oncrete dam, but also the solid foundations for further study on the seismic safety of inservice concrete dams.

Due to the steel radial gates’ characteristics of structural and acting forces, the investigation on parametric resonance of radial gates’ arms has always been the hot topic in the research field of radial gate’s dynamic stability. In this paper, the simplified space frame is taken as the analytical model, and according to the elastomer perturbation equation and beam element model of thin-walled structure, the dynamic instability region of radial gates can be obtained by the finite element method, then the computational method is applied to calculate the main regions of dynamic instability for a working radial gate. Furthermore, combing with the physical and numerical models, a new method recognizing the parameter resonance of steel radial gates is proposed. The investigations, in this paper, are not only important improvement for the radial gates’ parametric vibration computational method, but also a solid foundation for further study on the dynamic stability of radial gate structure.