Fragility Curves of Corrosion Steel Cylindrical Tanksunder Seismic Loadings

• Main Authors: Lin, Jhong-You, 林忠佑
• Other Authors: Chen, Kuan-Hsoung
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/22013267861076253059

碩士 === 國立金門大學 === 土木與工程管理學系碩士班 === 105 === The objective of this research is to develop the corrosion cylindrical steel tanks subjected to seismic loading. The fluid-structure-soil interactions are incorporated in the dynamic analysis. The tanks are modeled as thin shells. The hydraulic loading includes impulsive mass and convective mass. The soil mediums are simulated three dimensional solid elements. The viscous transmitting boundary is attached to boundary to avoid seismic wave reflection. The nearfault seismic ground accelerations only consider the horizontal components. Chapter 1 is devoted to introduction, including motivation of this research, methodology, literature review of the previous studies, and the organization of this thesis. Chapter 2 addresses the description of cylindrical steel tanks with various ratios of heights and radii. In the chapter 3, the forty-six near-fault earthquake components with pulse-like velocities are served as horizontal input ground accelerations. Chapter 4 is concerned with modal analysis and dynamic analyses of steel tanks with different degree of corrosion. Based on results of chapter 4, the fragility curves of corrosion steel tanks subjected to near fault earthquakes are developed in chapter 5. The damage indexes based on the drift ratios use to classify the various damage states. The fragility curves of corrosion steel tanks are developed with this damage indexes, accordingly.Chapter 6 presents the conclusions and final remarks, the contribution and feature of this research as well as the future study. The results of this research can be implemented in the primary design of aged corrosion steel tanks.