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Although many studies on the blast-resistant performance of structures have focused mainly on single members such as beams and columns, there is little research on the behavior of joints that are subjected to blast loads. In this study, the structural behavior of a slab–column connection subjected to blast load was investigated using a numerical analysis method. LS-DYNA was used as a finite element analysis program, and in order to improve the accuracy of numerical analysis, mesh size, material model, and simulation method of blast load were determined through preliminary analysis. The effect of different restraints of the joints, depending on the position of the columns in the slab, on the blast resistance performance was investigated. As a result, the highly confined slab-interior column connection showed better behavior than other edge and corner columns. The drop panel installed between the lower column and the slab was effective in improving the blast-resistance performance of the slab–column connection. For a more accurate evaluation of blast resistance performance, it was suggested that various evaluation factors such as ductility ratio, reinforcing stress, and concrete fracture area can be considered along with the support rotation, which is an important evaluation factor suggested by many standards.
Kwang Mo Lim; Taek Hee Han; Joo Ha Lee. Numerical Simulation on Dynamic Behavior of Slab–Column Connections Subjected to Blast Loads. Applied Sciences 2021, 11, 7573 .
AMA StyleKwang Mo Lim, Taek Hee Han, Joo Ha Lee. Numerical Simulation on Dynamic Behavior of Slab–Column Connections Subjected to Blast Loads. Applied Sciences. 2021; 11 (16):7573.
Chicago/Turabian StyleKwang Mo Lim; Taek Hee Han; Joo Ha Lee. 2021. "Numerical Simulation on Dynamic Behavior of Slab–Column Connections Subjected to Blast Loads." Applied Sciences 11, no. 16: 7573.
The behavior of a slab-column joint subjected to blast loads was studied by numerical analysis using a general-purpose finite element analysis program, LS-DYNA. Under the explosive load, the joint region known as the stress disturbed zone was defined as a region with a scaled distance of 0.1 m/kg1/3 or less through comparison with ConWep’s empirical formula. Displacement and support rotation according to Trinitrotoluene (TNT) weight and scaled distance were investigated by dividing in and out of the joint region. In addition, fracture volume was newly proposed as an evaluation factor for blast-resistant performance, and it was confirmed that the degree of damage to a member due to blast loads was well represented by the fracture volume. Finally, a prediction equation for the blast-resistant performance of the slab-column joint was proposed, and the reliability and accuracy of the equation were verified through additional numerical analysis.
Kwang Mo Lim; Do Guen Yoo; Bo Yeon Lee; Joo Ha Lee. Prediction of Damage Level of Slab-Column Joints under Blast Load. Applied Sciences 2020, 10, 5837 .
AMA StyleKwang Mo Lim, Do Guen Yoo, Bo Yeon Lee, Joo Ha Lee. Prediction of Damage Level of Slab-Column Joints under Blast Load. Applied Sciences. 2020; 10 (17):5837.
Chicago/Turabian StyleKwang Mo Lim; Do Guen Yoo; Bo Yeon Lee; Joo Ha Lee. 2020. "Prediction of Damage Level of Slab-Column Joints under Blast Load." Applied Sciences 10, no. 17: 5837.