Blast Responses and Vibration of Flood-Defense Structures under High-Intensity Blast Loadings

Yonghee Ryu,Bu-Seog Ju,Wooyoung Jung,Hoyoung Son

doi:10.1155/2018/4750345

Yonghee Ryu, Bu-Seog Ju + Show 2 more

Open Access

https://doi.org/10.1155/2018/4750345

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Abstract

This study presented the blast behavior of flood-defense structures subjected to high-intensity loadings such as blast shock waves. In order to understand the blast behavior of weir structures, PHAST program was used to predict blast loadings in consideration of material reactivity and congestion levels. Environment factors such as weather data and atmospheric parameters were also considered in this study. Then, nonlinear dynamic analyses were performed using the ABAQUS platform to evaluate structural responses and blast vibration of concrete weir structures subjected to various types of blast loadings, due to uncertainties of the magnitude and durations of blast loads as a function of distance from the explosion. It was shown that the blast damage to concrete weir structure was significantly influenced by congestion levels or material reactivity. Also, the stress concentration under blast loading was observed at the connection area between the concrete weir body and stilling basin.

Highlights

Critical infrastructures such as bridges, dams, nuclear power plants, lifelines, and buildings can be exposed to terrorist attacks and chemical explosions
Fujikura et al [8] described the behavior of bridge pier systems under multihazard scenarios such as seismic and blast loadings based on FEMA [9] and FHWA [10]
In order to understand the behavior of weir structure as a flood-defense structure subject to high-intensity loadings such as explosions, a numerical Finite Element (FE) model was developed using the ABAQUS [18] platform in this study

Summary

Introduction

Critical infrastructures such as bridges, dams, nuclear power plants, lifelines, and buildings can be exposed to terrorist attacks and chemical explosions. In order to generate a scenario involving blast loads related to man-made hazards, PHAST [12] as a consequencemodeling program was employed for several important factors such as humidity, temperature, material reactivity, and congestion. This validated program [13,14,15] is widely used to calculate the blast loadings using a Baker-Strehlow-Tang (BST) model in which the blast model is validated by experimental data [16, 17].

Selected Target Areas and Flood-Defense Structures

Numerical Model of Weir Structures

Blast Loading from Gas Explosion

Prediction of Blast Pressure Using PHAST

Findings

Conclusions