Parametric Study on the Performance of UHPC and Nano-modified Polymer Concrete (NMPC) Composite Wall Panels for Protective Structures

摘要

This study presents the performance of hybrid concrete walls incorporating ultrahigh-performance concrete (UHPC) and nano-modified polymer concrete (NMPC) under blast loading. UHPC has compressive strength with failure strain very close to that of conventional concrete. Such strain is insufficient to sustain large plastic deformations required for structures subjected to very high strain rates. However, NMPC made from cement replacement by epoxy polymer provides failure strain ten times higher than conventional concrete, tensile, and excellent bond strengths. The nonlinear finite element code LS-DYNA has been used to conduct the numerical analyses. The hybrid composite concrete walls were produced by interconnecting elements made of UHPC and NMPC and were assessed for post-blast damage. The key parameters considered were charge weights, standoff distances, and the composite action of the composite UHPC and NMPC wall panels. The proposed hybrid concrete walls showed outstanding resistance to blast scenarios.