# Numerical Simulation on Dynamic Behavior of Slab-Column Connections Subjected to Blast Loads
## 2 Literature Review  
There are some studies on the structural behavior of the slab-column connections according to the position of columns under static loads. [PERSON] et al. (1960) performed tests on a total of 45 specimens of the interior, edge, corner, and isolated columns [9]. As a result, the effective strength of the interior column-slab joint was 75% of the column strength and 1.5 times the slab strength. However, when the column strength exceeds the slab strength by 1.4 times, the effective strength of the column-slab joint at the edge and corner columns is not significantly increased by the restraint of the surrounding slab [9]. [PERSON] et al. (2000) performed a total of 12 test specimens consisting of column-slab specimens and isolated column specimens [10]. The interior column showed greater axial compressive strength than the isolated column due to the restraint effect of the slab, and also showed ductile behavior [10]. [PERSON] et al. (2007) performed column load transmission experiments depending on the position of the column. As a result, the interior column test specimen has improved ultimate load capacity than the isolated column specimen due to the slab restraint effect [11]. There are also many studies on the structural behavior of slab-column connections under dynamic loads. Some of them experimentally confirmed that the amount of flexural reinforcement affects the seismic behavior of the slab-column joint [12; 13; 14; 15; 16]. Some studies have investigated the seismic response of slab-column joints with high-strength concrete (HSC) applied to the slab, and they showed that the specimens with HSC had superior performance in terms of ductility and strength, compared to specimens with conventional normal strength concrete (NSC) [17; 18; 19; 20]. [PERSON] and [PERSON] (2016) performed cyclic experiments on four full-scale exterior slab-column connections made of normal concrete and fiber-reinforced lightweight aggregate concrete [21]. They reported that the addition of steel fibers to the concrete mix improved the hysteretic behavior of slab-column connections [21]. Several researchers have studied the progressive collapse and robustness of building structures due to column or joint collapse [22; 23; 24; 25; 26]. [PERSON] et al. (2019) performed numerical analysis on slab-column connections subjected to cyclic loading and captured the characteristics of cyclic degradation observed in experiments with nonlinear finite analysis and suggested a simplified design method for punching shear [27]. As shown above, studies dealing with the structural behavior of joints under dynamic loads mainly focus on seismic loads. While there are relatively many experimental and numerical investigations of reinforced concrete (RC) slabs subjected to blast loading [28; 29; 30; 31; 32; 33; 34; 35; 36; 37], there are few studies of slab-column connections. [PERSON] et al. (2021) numerically investigated the blast response and progressive collapse of RC structures equipped with viscoelastic dampers [38]. They found that viscoelastic dampers designed for seismic loads resulted in a suitable performance for reducing the response of structures to blast loads [38]. [PERSON] (1999) reported that plastic hinge control through diagonal reinforcing bars can contribute to the improvement of the blast resistance performance of the connections [39]. [PERSON] et al. (2016) have reported the blast-resistance performance of joints of slab-interior and slab-edge columns [40]. However, there is no study on the blast-resistance behavior for the slab-corner column connection and for the relatively large explosive load. Additionally, the method of transmission of the explosive load has not been verified sufficiently in the numerical analysis. Therefore, it is necessary to investigate the blast-resistance performance of slab-column connections depending on the type of the column and the amount of explosive load.