Verbund-Opferzellen zum Schutz von Stützen bei Nahdetonation

Composite cross sections have been shown to be generally well suited for constructing explosion-resistant load-bearing structural members, such as columns or bridge piers, with high protection demands. Composite sacrificial cells which are built around the member's cross section enhance the protection of columns and piers exposed to high dynamic loading. Due to energy absorption outside the load-carrying cross section the reflected pressure and induced shock wave are significantly reduced. It is investigated whether the layer sequence of two distinct materials (a less dense, more deformable material versus one that is denser and stiff er) is measurably different for protection of other material layers including the structural member's inner core. We also study whether shock wave reflection and reduced transmission of shock waves, achieved with specific material layering in sacrificial cells, practically result in significant protection of the underlying structure. We also compare the protection potential of sacrificial cells with the effectiveness of other protective measures such as the variation of boundary condition and the cross section design. The paper finalizes with an elaborate design diagram which summarizes the residual axial capacity of columns after the blast event and the extent of damage when using sacrificial cells.