Specific Energy Absorbed by Fiber-Reinforced Concrete Under Static and Dynamic Loading

Dynamic strength is one of the factors determining the strain of buildings and structures under extreme impacts caused by, among other things, the restructuring when one of the load-bearing elements fails, as well as the dissipation properties of the materials the structure is made of. The purpose of this research is to analyze the dynamic strength parameters and dissipation properties of concrete and fiber-reinforced concrete under loads typical for emergency impacts and failures of one of the load-bearing elements. The results of the dissipation properties comparison for workpieces made of concrete types with different compression strength grades, as well as concrete reinforced with indirect-reinforcement fiber grid in terms of the specific strain energy absorption allowed the authors to recommend fiber-reinforced concrete for effective local reinforcement of structures taking into account their strength against specific emergency impacts. The suggested analytical expression for the specific strain energy absorption can be used to assess the additional dynamic loading of reinforced concrete building frames under specific emergency impacts.