Part of #Behavior of Bolted End plate Connections under Internal Blast Load# :
Publishing year : 2012
Conference : Fourth International Conference on Reinforcement
Number of pages : 12
Abstract: Terrorist and hostile attacks, as well as accidental explosions, cause local damage or even general collapse of structures and cause significant loss of life and property. Considering the ever-increasing hostile and terrorist threats, the concept of passive defense should be considered in the design of structures. Therefore, the study of behavior of various structural members including columns, beams and connections under blast loading is very important. Among these structural members, connections have a key role in the overall response of a structure to a blast load and its improper design or construction may result in a structure collapse. In this paper, the behavior of bolted end plate connections under blast loading is investigated. Bolted end plate connections are widely used in steel framed structures. Some of the significant features of end plate connections are the moment resistance, rotational stiffness and ductility. When an explosion occurs in a structure, a large amount of energy is applied to the structure in a very short time and high ductility is needed to absorb such a great amount of energy. The finite element models are used to simulate the behavior of the connection under blast load. To verify the results of finite element models, the model verification is carried out using the results of an experimental experiment conducted by previous researchers. Having ensured the accuracy and capability of the finite element models in predicting the behavior of the bolted end plate connection, a 7-storey building is designed and the moment and shear force at the location of the first-floor connection are used to design the bolted end plate connection. The connection is then exposed to the internal blast of a TNT charge. The charge is assumed to be placed in the room center and its weight is considered to be 15, 30 and 45 kg. Nonlinear explicit dynamic analysis is used to simulate the structure response to blast loading. The results show that shear bolts are unsuccessful due to blast pressures and the beam experiences a torsion. Based on the results of this study, it is recommended to use 2 rows of horizontal shear bolts to prevent the failure of the shear bolts.