Numerical Simulation of a Subway Station Structure Subjected to Terrorism Bombing

Qiushi Yan

doi:10.2174/1874149501509010688

Abstract

Subway stations are important means of transportation and main targets attacked by terrorists. In order to study the subway station response and damage subjected to blast loading, numerical simulation is carried out to estimate a subway station in beijing. An “explosive-air-structure ” dynamic interactive numerical model is built for the blast dynamic analysis of subway station subjected to blast. The patterns of damage about column are compared in different charges of explosive. The damages of concrete and reforcing bar in column are discussed. Although the column near the explosive is destoried under the charge of 30kg TNT, The calculations showns that it’s safe for the subway station to subject to blast loading under the charge of 30kg TNT. The local damage of column influence collapse of the station little. The dynamtic response of the structure is given to support the protection on the subway station against terrorism bombing.

Highlights

INTRODUCTIONR Subway are important means of transportation in city. A make lots of people deaths and injured, with the station structures collapse or damage
R Subway are important means of transportation in city.Once an explosion happens inside a subway station, it mightA make lots of people deaths and injured, with the station structures collapse or damage
When the dynamite explodes in the subway station, the blast wave reflects and superposes inside close-in space

Summary

INTRODUCTION

R Subway are important means of transportation in city. A make lots of people deaths and injured, with the station structures collapse or damage. Numerical techniques are better method to simulate subway stations subjected to blast. A subway station in Beijing has been analysed which subject to blast loading with the TNT charges of 5kg, 10kg. It’s difficult to simulate the interaction bettween the blast wave and the structures. The response of structure can be researched with the previous blast load. A kind of “explosive - air -structure ” dynamic interactive numerical model is built for the blast dynamic analysis of subway station subjected to blast in this paper. R columns are main bearing members in subway station, the reinforcing bars and concrete in columns are modeled sepa-. It’s a three-invariant model, uses three shear failure surfaces, includes damage and strain-rate effects. The main parameters of the concrete constitutive model are listed in Table 1, where c is the concrete density, Ec is elastic modulus, is Poisson ratio, fc is compressive strength of concrete, ft is tensile strength of concrete, f is failure strain of concrete

Material Constitutive Models

NUMERICAL RESULTS AND DISCUSSIONS

CONCLUSION

E Received