Stability Analysis and Dynamic Analysis of Structures due to Internal and External Explosions in Far Field and Near Field Earthquakes

Earthquake and explosion are destructive dynamic forces. These forces can cause severe damage to the structure due to the time-dependent nature of the impact. One of the most important parameters for checking the stability of structures is the study of their buckling modes. The stability check has a direct relationship with the critical load of the columns. In this paper, the effects of simultaneous explosions and nearearthquake earthquakes on the stability of structures are investigated. The purpose of this research is to numerically simulate the state that earthquake-induced vibrations cause explosives to explode near structures. Therefore, the dynamic and buckling behavior of structures under the effects of earthquake and explosion have been investigated. In this article, the explosion enters the structure in three phases with the earthquake simultaneously. These three stages include before the earthquake, at the time of the earthquake and after the earthquake. In this regard, in this paper, structures are affected by internal and external structural explosions and the simultaneous effects of earthquakes. This article has shown that the most critical situation is when the vibrations caused by an earthquake trigger an explosion during its strong movement. The results of this paper show that the combination of explosion and earthquake is not very effective if the explosive is more than 500 kg TNT. In fact, earthquakes in this case have little effect on the nonlinear response of the structure. In this paper, it is shown that the effects of P-Delta consideration do not have much effect on the structure response. Based on the results provided for different explosions and earthquakes, it can be seen that the combination of explosion and earthquake has a greater effect on dynamic analysis.