Abstract
The seismic performance of the aged-concrete gravity dam (aged-CGD) by safety assessment based on the reliability-index is the main focal point of this study. Determination of reliability-index has been handled by the site seismic hazard analysis with the help of PSHRisk-tool (developed by the authors) and risk assessment. Incorporated with the uncertainties, the failure probability has been carried out by the IDA and fragility analysis. For the nonlinear finite element model of the CGD, the concrete damage plasticity (CDP) model is adopted. To investigate the aging effect, the hygro-chemo-mechanical model has been taken for different years consideration. Through the failure risk assessment of serviceability and safety level, the target reliability index has been determined here for an existing CGD in Korea. Despite several types of research on the CGD safety assessment, the main novelty of this proposed approach will help the dam operator to check the safety barrier for the aged-CGD. A safety index is investigated by comparing the target reliability-index of the age-CGD with the reliability-index for two potential earthquake levels. However, the proposed approach can implement to check the safety range of any seismic site for any set of earthquakes.
Highlights
Safety evaluation is intimately involved with the word reliability
The failure probability comes from the fragility analysis of the structure, where the vulnerability is defined as the combination of the failure function and the seismic hazard analysis of the site
Several mathematical tools are available for the DoE, and Central Composite Design method (CCD) developed by Box and Wilson [51] is a very useful tool to reduce the experimental phase
Summary
Safety evaluation is intimately involved with the word reliability. Reliability analysis depicts the probabilistic failure consequences by several natural hazardous conditions. The reliability-based safety index will help someone understand the safety determination of a structure taking the probabilistic meaning of the traditional concept. The definition of reliability analysis is implied through a function containing all random variables and their stochastic distribution [1]. Structural risk analysis is the expansion of the reliability analysis, which leads to the failure function as a structural response. The failure probability comes from the fragility analysis of the structure, where the vulnerability is defined as the combination of the failure function and the seismic hazard analysis of the site. This chapter will briefly discuss the background which will express the related literature review and the scope of this study
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