Seismic Dynamic Reliability Analysis Of The Aqueduct Structures

The south-to-north water diversion Project will change from the water resources on the space-time distribution to adapt to the social development, to the needs of production and life. The aqueduct is the main hydraulic structure of the south-to-north water diversion project, which safety directly related to the use of the entire project of south-to-north water diversion project.The south-to-north water diversion project belongs to the serial structure system,once an important tache was damaged in the earthquake,the water diversion was namly interrupted and may cause some other disasters.So it's significative to evalue the safty of large-scale aqueduct and using the theory of reliability analysis and calculation aqueduct structures in the earthquake effect of failure probability.Based on the thin-wall dynamic analytical model of aqueduct with fluid-structure coupling,using the methods of the moment methods and the maximum entropy methods to calculate the probability of failure of the aqueduct structures.Main content as follows:The first,a three dimensions'model with fluid-structure interaction is made. In this model the influence of the bend-torsion coupling, water-structure coupling and nonlinear rubber bearing isolation are all taken into consideration.The second, using the same target of specification artificial seismic response spectrum method of synthesis, according to the site conditions where aqueduct structures and fortification criteria, the 500 artifical seismic waves are created.The third, according to the established considering the aqueduct of fluid-solid coupling dynamic analysis model of thin-walled structure, analysis of the aqueduct structures self-vibration characteristics, using dynamic time-history analysis and research of the response of aqueduct structures in the natural and artificial seismic waves under the action of earthquake.The fourth, using gradient method to calculate the bottom section of the aqueduct reinforced concrete stents three-bit yield.The fifth, use the calculated aqueduct stents bottom yield three-bit and seismic response of stent bottom bending, in accordance with moment methods of reliability and the maximum entropy principle, the reliability distribution function and the aqueduct failure probability are calculated.