# Dynamic Response and Damage Characteristics of Large Reinforced Concrete Slabs under Explosion
## 1 Introduction  
Reinfor forced concrete is widely used in many kinds of buildings because of its low cost and outstanding mechanical properties. With the rapid development of modern industry, there are an increasing number of explosion incidents caused by industrial explosion accidents, and reinforced concrete buildings are subjected to explosion damage. As one of the main load-bearing components of a building, the dynamic response and damage characteristics of the reinforced concrete slabs under explosion load have important effects on the whole structure of the building. Recently, many studies on the dynamic response characteristics of reinforced concrete slabs under explosion loads have been reported [1,2]. [PERSON] [3] studied fragments of reinforced concrete slabs (1 m \(\times\) 2 m \(\times\) 0.12 m) under the conditions of nearby explosions. Based on the experimental results, [PERSON] [4] introduced an Arbitrary Lagrangian Eulerian-FEM-smoothed particle hydrodynamics (ALE-FEM-SPH) coupling method to predict the spalling damage of RC slabs (1 m \(\times\) 2 m \(\times\) 0.12 m) subjected to a blast load. In terms of other blast loading conditions, [PERSON] [5] studied the dynamic behaviors of RC slabs (2.4 m \(\times\) 1.0 m \(\times\) 0.1 m) under long-duration (85-135 ms) near-planar explosion loadings in a specified apparatus. [PERSON] [6] carried out a research investigation on the structural response of RC slabs subjected to combined fire and blast. [PERSON] [7] studied the blast resistance of air-backed RC slabs against underwater contact explosions. [PERSON] [8] investigated the failure characteristics of two-way RC slabs (1 m \(\times\) 1 m \(\times\) 0.04 m) under combined blast andfragment loading and conducted numerical studies based on the finite element-smoothed particle hydrodynamics (FEM-SPH) method. [PERSON] [9] analyzed and compared the failure modes of reinforced concrete slabs under different explosion conditions. [PERSON] [10] studied the surface damage characteristics of external RC slabs (4.4 m \(\times\) 1.46 m \(\times\) 0.15 m) reinforced by carbon (CFRP) and E-glass (GFRP) fibers. [PERSON] [11] revealed the failure modes and blast-resistant mechanism of steel-wire-mesh-reinforced high-performance concrete slabs (1.5 m \(\times\) 1.5 m \(\times\) 0.15 m) protected by an ultrahigh-molecular-weight polyethylene (UHMWPE) fiber-reinforced cloth (FRC). In addition, polyurea-woven glass fiber mesh composites and engineered cementitious composites were also reported as reinforcement materials for RC slabs [12; 13]. [PERSON] [14] investigated the practicality of using machine learning to predict the maximum displacement of fiber-reinforced polymer-strengthened RC slabs. There are a few relevant studies on large-sized RC slabs and large-charge explosion tests. For damage assessment, pressure-impulse (_P-I_) curves can not only reflect the damage effect of the explosion peak overpressure but can also consider the influence of the cumulative impulse generated by explosion overpressure, and they are the most scientific and effective evaluation tool at present. Based on the dimensionless analysis method of the single-degree-of-freedom (SDOF) model, [PERSON] [15; 16] adopted the failure criterion based on maximum displacement to obtain the normalized _P-I_ curves of the SDOF system. [PERSON] et al. [17] obtained the _P-I_ curves of brick walls based on the test data of 236 groups of brick walls under explosions. [PERSON] et al. [18; 19; 20] studied the _P-I_ curves of reinforced concrete members by using the SDOF numerical solution method. The approximate positions of the overpressure asymptotes and impulse asymptotes of the _P-I_ curves were determined using the energy balance method. Then, the _P-I_ curve corresponding to the critical damage degree was obtained through a large number of numerical simulation calculations and necessary curve fitting methods. [PERSON] et al. [21] derived the _P-I_ curves of reinforced concrete slabs through a numerical simulation.