Preliminary Investigation of Local Failure Modes in Steel-Plate Composite Walls Subjected to Missile Impact

摘要

Steel-plate composite (SC) walls can provide excellent resilience for impactive and impulsive loading. This is due to their design, which consists of a concrete core sandwiched between two steel faceplates. The perforation resistance of SC walls for missile impact can be evaluated using a three-step method available in the literature. If perforation is prevented, other failure modes such as punching shear failure, excessive deflections, and steel plate fracture failure due to extensive yielding must be checked. Currently, there are no methods or guidance available in the research or design literature for checking these failure modes. This paper presents the results of numerical investigations which evaluate the failure modes of SC walls. A total of 80 detailed numerical models were developed and analyzed to investigate the effects of wall design parameters and boundary conditions. This paper only includes a selection of the total study and is focused only on evaluating shear failure not the other possible failure modes. The numerical results indicate that there are three failure modes other than perforation: (i) brittle shear failure, (ii) ductile flexural yielding followed by fracture of ties, and (iii) highly ductile plastic mechanism formation. The minimum shear (tie bar) reinforcement ratios required to change the failure mode from punching shear to flexural yielding to plastic mechanism formation are discussed.