Abstract
Load bearing columns exist in most constructions and are applied for instance as floor columns or as bridge piers. The study performed here addresses the question how the load-bearing column behaves under blast load and which constructive measures result in an enhanced resistance against the blast pressure wave. Simple single-cell steel cross section set-up is changed stepwise by implementation of multi steel cells or by filling the hollow steel section with concrete. In doing so, the column is not generated as an isolated member, but installed in a flexible neighboring system, which allows taking the connection ductility into account. The response behavior of representative steel and composite column types is investigated, the section is searched for local overstresses and the failure mechanisms of the structural member are defined. The evolution of the cross section set-up and the corresponding changes in the simulation results enable the formulation of decisive parameters which contribute to the enhancement of member blast resistance. The study pursues the specific local resistance design approach and aims at developing constructive protection technology in order to avoid the detected local damages. The column base appears to be the vulnerable section at the column rigidly or less flexible connected to the ground. The strategic use of ductile bearing condition is applied to reduce stress concentration by allowing deformation and energy dissipation, in order to safely transmit the high lateral forces into the fundaments. Structural solutions which represent an invisible protection measure are evaluated in regards to their effectiveness. The numerical analysis of this study is performed by using the MD Nastran software.
Translated title of the contribution | Effect of ductile connections on blast resistant load bearing columns |
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Original language | German |
Pages | 436-446 |
Number of pages | 11 |
Volume | 77 |
No | 6 |
Specialist publication | Stahlbau |
DOIs | |
State | Published - Jun 2008 |