Research On Antiknock Performance Of Steel Reinforced UHPC Column Under Blast Loading

On the one hand, terrorist bombing attacks occur frequently on the world inrecent years, the other hand,flammable materials inside the building due to natural orhuman-induced accidental explosion also occurr. Explosion near the explosion sourcewill cause serious personnel casualties and severe property damage.In addition strongshock produced by the explosion will be applied to the surrounding buildings, whichcauses severe shock surrounding buildings and damages destruction, and even makethe key component of constructions lose carrying capacity,which results in theprogressive collapse of the building, and thus lead to more serious disaster. Improvethe material properties is a powerfull mean to improve the antiknock performance ofbuilding structures, to prevent structural loads in strong explosion to collapse.Therefore, in order to effectively prevent strong in a variety of structures under blastloading failure occurs collapsed, to the greatest extent possible to protect people’slives and property, this paper, ultra-high performance concrete (Ultra-HighPerformance Concrete) as the starting point, the system of ultra-the mechanicalproperties of high performance concrete reinforced concrete columns and ultra-high-performance blast loads in the dynamic response and antiknock proofperformance, ultra-high performance on the role of reinforced concrete column in theblast loading and ultra-high performance reinforced concrete column in the explosionloads nonlinear response, destruction, damage and failure mechanisms of a detailedfield test and numerical simulation. The main research work includes the followingaspects:（1）Through the ultra-high performance concrete mix design, not only studiednanomaterials on ultra-high performance concrete fluidity influence also studiednanomaterials and steel fibers for ultra-high performance concrete mechanicalproperties of the final choice and to develop an optimal mixture ratio.（2）By means of ultra-high performance concrete basic mechanical propertiesof the optimal mix produced using ultra-high performance concrete basic mechanicalproperties.（3）An explicit dynamic finite element analysis software LS-DYNA forultra-high performance concrete compressive and flexural tests were simulated, andthe results of numerical simulation and experimental results are compared to verifythe materials used model parameters adaptability and effectiveness. （4）Eestablished under blast loading ultra-high performance dynamic responseof reinforced concrete columns and damage destruction numerical simulation method,in this method, the use of reinforced concrete separate model, does not consider thebond between steel and concrete slip.（5）For ultra-high performance concrete and reinforced concrete columnsunder blast loading in the same dynamic response were compared. Study suggests.Ultra-high performance reinforced concrete columns antiknock performance thanordinary reinforced concrete columns antiknock performance has greatly improved.