Failure Behavior Of Reinforced Concrete Columns Subjected To Strong Impact Load

As the most common structure of modern architecture,reinforced concrete framestructures are widely used in constructional engineering.When the reinforced concreteframe structure is in service, it could well suffer severe strong impact loading inaddition to quasi-static load, such as collisions from cars to the frame bottom columnsin underground parking, glancing collisions at the corner of the street orterrorist bombings arising from the increasingly rampant terrorism. In the event,architectural structures could be badly damaged.Frame columns are primary members of the structure,for which theirfailure behavior will directly affect the dynamic response of the overall frame structure,especially the frame bottom columns, are the priority for all. This paper is directedagainst the condition of blast struck, in which the structure finite element analysissoftware SAP2000is applied to simulate the overall frame structure to study thedynamic response of reinforced concrete frame columns under explosion load and thefollowing dynamic response of frame structure result from it. Therefore, for the sake ofprimary study on the anti-explosion of frame structure, the following two core contentswill be study in the paper.(1)We used SAP2000to simulate the frame structure model to conduct thenonlinear dynamic time history analysis. Then we studied the acceleration anddisplacement time history curve of beam-column joints with the addition of plastichinge development of structure, to summary the dynamic response characteristics andthe law of frame columns and structure under explosion load.(2)In order to study the failure behavior of frame columns further, we analyzed theparameters effect of a2×3frame to study the influence of principal factors such asscaled distance, configuration of longitudinal bar and strength grades of concrete onanti-explosion behavior of reinforced concrete frame columns.