Overall seismic reliability analysis of aqueduct structure based on different levels under random earthquake

The seismic reliability analysis method of large aqueduct structure is of great significance to its operation and maintenance safety evaluation and seismic toughness evaluation in the life cycle. In this paper, the seismic reliability analysis method of aqueduct structure at different levels is proposed based on the probability density evolution theory and the random ground motion model of engineering physics. Taking Shuangji River aqueduct as an example, 100 random seismic acceleration time-history samples and corresponding probability assignments are generated based on the engineering physical random ground motion model, and combined with the nonlinear response analysis platform of fiber beam element of aqueduct structure,the dynamic response analysis of the aqueduct structure under nonlinear and random coupling conditions is carried out from the perspective of the whole process of nonlinear development. And by introducing different failure criteria of the aqueduct structure, the overall seismic resistance of the aqueduct structure under different fortification targets is quantitatively analyzed. The results show that the coupling of randomness and nonlinearity has a significant impact on the dynamic response of the aqueduct structure. The overall seismic reliability analysis method based on different fortification levels can accurately solve and evaluate the overall seismic reliability of the aqueduct structure under different fortification levels. The research results have important theoretical significance for the overall seismic reliability analysis and design of aqueduct structures based on multi-level fortification targets.