Response of steel tanks under seismic action is a structural topic of interest in the framework of industrial risk assessment because collapse of these structures may trigger other catastrophic phenomena, as vapor cloud explosion (VCE) or pool fires. Damages suffered by storage tanks under seismic actions are generally related to large axial compressive stress that can cause the instability of tank shell near the base (known as Elephant Foot Buckling, EFB) and large displacement of unanchored structures (sliding and uplifting) that can induce collapse of piping connections and loss of containment. This paper deals with the seismic response of anchored and unanchored liquid storage tanks focusing on the EFB. The algorithm to solve the equation of motion for simplified tank's model is proposed and seismic demand and seismic fragility are accordingly evaluated. Comparative analyses including both horizontal seismic input are discussed in order to point out the effects of ground motion and effects of two fundamental parameters on the seismic response: filling level and friction factor. The results represent a contribution on the optimization of incremental dynamic procedure to be use in seismic assessment of hazardous materials containment structures and a design support for risk mitigation measures for existing storage plants. © 2008 Taylor & Francis Group.
Fragility analysis of liquid storage steel tanks in seismic areas / Di Carluccio, A.; Manfredi, Gaetano; Iervolino, Iunio; Fabbrocino, G.. - 2:(2008), pp. 1049-1055. (Intervento presentato al convegno 4th International Structural Engineering and Construction Conference tenutosi a Melbourne (Australia) nel 27-28 September 2007).
Fragility analysis of liquid storage steel tanks in seismic areas
MANFREDI, GAETANO;IERVOLINO, IUNIO;
2008
Abstract
Response of steel tanks under seismic action is a structural topic of interest in the framework of industrial risk assessment because collapse of these structures may trigger other catastrophic phenomena, as vapor cloud explosion (VCE) or pool fires. Damages suffered by storage tanks under seismic actions are generally related to large axial compressive stress that can cause the instability of tank shell near the base (known as Elephant Foot Buckling, EFB) and large displacement of unanchored structures (sliding and uplifting) that can induce collapse of piping connections and loss of containment. This paper deals with the seismic response of anchored and unanchored liquid storage tanks focusing on the EFB. The algorithm to solve the equation of motion for simplified tank's model is proposed and seismic demand and seismic fragility are accordingly evaluated. Comparative analyses including both horizontal seismic input are discussed in order to point out the effects of ground motion and effects of two fundamental parameters on the seismic response: filling level and friction factor. The results represent a contribution on the optimization of incremental dynamic procedure to be use in seismic assessment of hazardous materials containment structures and a design support for risk mitigation measures for existing storage plants. © 2008 Taylor & Francis Group.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
