Fragility of Bridge Columns under Vehicle Impact Using Risk Analysis

Kyeongjin Kim,Jaeha Lee

doi:10.1155/2020/7193910

Abstract

In this study, risk analysis was conducted to evaluate the vulnerability of bridge columns to vehicle impact. A three-step risk analysis procedure was used. The first step involved a Preliminary Risk Analysis (PRA), which was an initial screening step to determine whether a bridge column requires second-step analysis or not. The second step was a Simplified Risk Analysis (SRA), which involved determining the level of risk (low, moderate, or high) for a bridge column. The third step comprised a Detailed Risk Analysis (DRA). Computer simulation was based on the results of SRA. In this study, the risk level of 8,267 bridges in South Korea was evaluated, and a resulting total of 58 bridge columns in the Risk Level High (RLH) category were selected as a result of SRA. These bridge columns were classified into five types based on their slenderness ratio. Using these five types of bridge column, DRA was conducted. As expected, larger deformations of the bridge column were observed if the vehicle velocity and slenderness ratio were both increased. Using the bridge columns in the categories of response high and response moderate under vehicle impact, fragility curves were proposed using statistical data of material strength and the few results of the numerical analysis.

Highlights

Bridges are important pieces of infrastructure that can help with the mobility of goods and people
Preliminary Risk Analysis (PRA) is a screening step, and this step judges the requirement of risk analysis before any further analysis. erefore, the details of factors such as the existence of a bridge column, type of bridge column, and existence of a lower road near a bridge column, as shown in Table 2, are confirmed in this step
It is reckoned that because column type I has a relatively smaller slenderness ratio and the top part of the column is restrained in the loading direction, a smaller support rotation from column type I was obtained

Summary

Introduction

Bridges are important pieces of infrastructure that can help with the mobility of goods and people. For designing bridge columns and to find the vulnerability of any bridge column under vehicle impact, risk analysis should be performed that takes account of factors such as service life, safety level, and distance from industrial areas. E risk analysis using risk-based methodology defines hazards that cause structural damage due to many factors [2]. Min et al [3] performed vehicular collision risk analysis of highway bridge columns. Ey defined both maintenance and repair costs as importance factors for performing risk analysis. E dimensions and locations of each of the bridge columns were considered as factors for estimating the vulnerability and occurrence of vehicle impact. Based on the estimated vulnerability and occurrence, typical types of highway bridge column were selected. Simulations of the bridge column truck collisions for evaluation of the selected bridge columns were conducted as part of a detailed risk analysis

Vehicular Collision Risk Analysis

Design load

Numerical Analysis

Conclusions and Further Study