Response of ultra-high performance cementitious composites filled steel tube (UHPCC-FST) subjected to low-velocity impact

This paper presents a combined experimental and numerical study on the transverse impact behavior of ultra-high performance cementitious composites filled steel tube (UHPCC-FST). UHPCC-FSTs were firstly fabricated by preparing the UHPCC with the cube compressive strength of 141.5 MPa. Then three specimens were tested in a drop-hammer impact device, and the impact force- and deflection-time histories of specimens under different release heights (5.0, 8.0 and 11.0 m) of the drop hammer were obtained and discussed. Furthermore, by using the commercial finite element (FE) program Hypermesh/LS-DYNA, a FE model was established to predict the impact behavior of UHPCC-FST. K&C constitutive model for concrete was adopted, and the corresponding model parameters for UHPCC were calibrated based on a series of test data (static compressive and direct tensile tests, dynamic compressive and tensile tests, triaxial compressive test, fly plate impact test), which were then validated by the present and existing drop hammer tests.