Experimental Study on Developing Scour Fragility Curves- A Case Study of Bridge Pile Foundation

• Main Authors: Ming-Yi Shen, 沈明毅
• Other Authors: Kuo-Chun Chang
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/39579605510962554552

碩士 === 國立臺灣大學 === 土木工程學研究所 === 101 === The escalating scale of natural disasters associated with global climate change and the growing world population increasingly threatens civil infrastructure. In particular, floods accelerate process of local scour around bridge piers resulting in damage to or failure of cross-water bridge structures. This study proposed a procedure for constructing scour fragility curves from flume experimental data for piled bridge pier. By a series of single-pile bridge pushover tests, the relationship between scour depth and capacity loss can be derived from the results. In addition, several flume experiments with a pier model scouring under controlled conditions were conducted and the scour process variation was observed. The scour depth observed from flume experiments were used to develop scour fragility curve which could be applied to evaluate the scour vulnerabilities of piled bridge pier for preliminary studies. A methodology to construct the scour fragility curve from flume experimental data was presented in this study; the main purpose of this paper is to show how the experimental data were used to build the scour fragility curves which are defined as a function of scour depth ratio or capacity loss ratio. The measured trend of the curves consists with the general scour process and the realistic behavior of piled bridge pier damage sequence. This paper has shown a feasible and practical methodology to construct the scour fragility curves from experiments.