Abstract
The Concrete Damaged Plasticity (CDP) constitutive is introduced to study the dynamic failure mechanism and the law of damage development to the aqueduct structure during the seismic duration using a large-scale aqueduct structure from the South-to-North Water Division Project (SNWDP) as a research object. Incremental dynamic analysis (IDA) and multiple stripe analysis (MSA) seismic fragility methods are introduced. The spectral acceleration is used as the scale of ground motion record intensity measure (IM), and the aqueduct pier top offset ratio quantifies the limit of structural damage measure (DM). The aqueduct structure’s seismic fragility evaluation curves are constructed with indicators of different seismic intensity measures to depict the damage characteristics of aqueduct structures under different seismic intensities through probability. The results show that penetrating damage is most likely to occur on both sides of the pier cap and around the pier shaft in the event of a rare earthquake, followed by the top of the aqueduct body, which requires the greatest care during an earthquake. The results of two fragility analysis methodologies reveal that the fragility curves are very similar. The aqueduct structure’s first limit state level (LS1) is quite steep and near the vertical line, indicating that maintaining the excellent condition without damage in the seismic analysis will be challenging. Except for individual results, the overall fragility results are in good agreement, and the curve change rule is the same. The exceedance probability in the case of any ground motion record IM may be estimated using only two factors when using the MSA approach, and the computation efficiency is higher. The study of seismic fragility analysis methods in this paper can provide a reference for the seismic safety evaluation of aqueducts and similar structures.
Highlights
The aqueduct is a water conveyance structure commonly used for irrigation, water transfer, and supply in water conservancy projects
The construction of the aqueduct structure can alleviate the severe water shortage disaster for human beings, and contributes to the local economic, science and technology, and social development, achieving the main sustainable development goals (SDG) that are employed by the United
Considered the concrete elastoplastic random damage constitutive relationship and the random seismic excitation model to carry out a random nonlinear seismic response analysis of the double trough aqueduct structure
Summary
The aqueduct is a water conveyance structure commonly used for irrigation, water transfer, and supply in water conservancy projects. Ying et al [5] studied the foundation soil property on the dynamic characteristics and responses of rectangular aqueducts. Some researchers have looked into the dynamic failure process of aqueduct structures under earthquake ground motion, taking into account the effect of fluid–structure interactions [7,8,9,10]. Li et al [11] proposed a simplified beam–water coupled system to investigate the seismic ground motion response to long spans of large-scale aqueduct structures. The traditional seismic dynamic analysis focuses on the dynamic response of the aqueduct structure itself under the action of ground motions, which can directly reflect the actual conditions of the aqueduct structure under seismic excitation. Most of the large-scale aqueduct structures studied by researchers today are in areas prone to earthquakes. Research on the damage and collapse of aqueduct structures under powerful earthquakes is critical to the structural safety assessment of engineering procedures to assure the safety of aqueducts and normal regulation of water resources during strong earthquakes
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