Dynamic Analysis Of RC Columns Subjected To Blast Loading

In rencent years, the dynamic responses of structures under impact, as a hot topic, have caused great concern in the civil engineering field.In this paper,the detailed dynamic response and damage feature of RC columns under lateral impact has been studied with experimental investigation. RC columns are the important load-bearing components in frame structure, once the stress destroys extremely possible result in the destruction of the entire building. Study of the anti-impact properties of the RC columns under impact loads has the practical significance and the application value.Considering the different ratio of reinforcement and axial compression ratio frame column sample are designed. To get the strain, the deflection and the support restraint situation of the essential spot through the multi-point loading test. The experiment using the multi-point load to simulate blast load.Through the test platform which is independently designed accurately simulate the actual stress situation of frame column, and satisfies the experimental request. The loading equipment uses the MTS hydraulic pressure serve to plan the power loading system and the gathering equipment uses American Iotech Corporation high speed portable test system DaqBook and StrainBook which can survey the high speed dynamic vibration strain signal.Through the experimental study, obtained the dynamic response and the failure mechanism of RC columns under the impulsive load function; The identical load speed, raises longitudinal reinforcement ratio can enhance ultimate bearing capacity,the deflection and the distortion ability of column; The same ratio of reinforcement,raises the load speed may enhance the ultimate bearing capacity, but will reduce the distortion ability of column; The ultimate bearing capacity improves under the different axial compression ratio,but the increases is little.