Behavior Of Concrete Filled Steel Tubular Column Under Blast Loading

Building structure may have to carry blast or impact loading induced by terrorism oraccidental explosion. Under blast loading, progressive collapse of building structure was ofteninduced the failure of key component of building structure. In this dissertation, the dynamicresponse of concrete filled steel tubular(CFST) under blast loading is studied. The primarywork and conclusions are as follows:(1) Introduces the equivalent single degree of freedom model(ESDOFM) of CFST, andthe derivation of parameters of ESDOFM are proposed. Although any components of thestructures are able to calculate their corresponding transform coefficients, but the method onlyfor relatively simple structure system is effective. The key problem is to assume thedeformation curve for different deformation stages and the maximum resistance of each phase.The shear deformation have to be considered for some cases.(2) The dynamic response of reinforced concrete column under blast loading is simulatedbased on ANSYS/LS-DYNA. The material parameters are determined based on experimentalresults. The numerical results are compared with experimental analysis and good agreementscan be observed.(3) The dynamic response of concrete filled steel tubular column numerical simulationanalysis is carried out based on simulation method. Three failure modes under different blastloads are investigated. The numerical results indicates that concrete filled steel tube columnstend to shear failure under the impulse loads, and it tends to bending failure under quasi-staticload. For most cases under dynamic load, concrete filled steel tube column are more likely tohappen bending and shearing failure.