Review on Experimental Research on Blast Resistance of Concrete Filled Steel Tubular Columns
Terrorist bombing attacks are frequent in the world today,with many of them targeting buildings and bridges.Columns,as important components of buildings and bridges,often become targets of attacks.Concrete filled steel tube columns have many excellent structural performances under conventional loads and have been increasingly widely used in engineering practice.In order to explore their anti-explosion performance,many scholars have conducted a lot of experimental research work.This paper summarizes these experimental research works and finds that the scaled distance between the explosive and the surface of the column and the quality of the explosive are the main factors determining the failure mode of the concrete filled steel tube columns.According to the differences in scaled distance and explosive quality,concrete filled steel tube columns will exhibit three different failure modes:local crater failure,local crater and overall bending failure,and overall bending failure.Factors such as the cross-sectional form of steel tubes,the ratio of outer diameter to wall thickness,concrete strength,and axial compression ratio all have a certain impact on the degree of failure under specific failure modes.In addition,after being subjected to near-range detonation,the axial and seismic residual bearing capacity of the concrete filled steel tube columns decreased,and the degree of decrease is proportional to the degree of explosion damage.On the basis of summarizing existing literature,this paper provides further research directions for the anti-explosion performance test of concrete filled steel tube columns.
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