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- 검색키워드
- 저자 : George Karagiannakis (검색결과 2 건)
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Seismic Assessment of Pipe Racks Accounting for Soil-Structure Interaction
Luigi Di Sarno,George Karagiannakis 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.6
The research on the seismic assessment of pipe racks accounting for coupling and soil-structure interaction eff ects is still scarce. Common industrial practice overlooks critical design aspects due to the insuffi ciency of current codes that might result in over-conservative or unsafe design. This work addresses the nonlinear analysis of a petrochemical plant steel pipe rack accounting for dynamic interaction with horizontal vessels and pipelines. Soil-structure interaction was evaluated both on pipe rack and pipelines in terms of interstorey-drift ratio and stress–strain response. An attempt was made for correlating the ratio with piping strain to make comparisons with common acceptance criteria for building structures, since code provisions do not address currently limit state design concept for pipe racks. Additionally, seismic fragility curves along with 95% confi dence intervals were evaluated for diff erent intensity measures and were used as a tool to demonstrate that the soil deformability could act as an isolation mechanism for pipelines. The increase of pipe rack displacements was an additional impact of soil, though, it was not as much profound as on the seismic response of the pipelines. The detailed structural assessment through extensive nonlinear dynamic analyses demonstrated that the return period of exceedance of pipe rack and pipelines limit state, considering the median spectral acceleration as a measure, occurred 1.84 and 2.64 greater than the design one, and this might be an indication that the performance-based concept should be applied for pipe rack systems to achieve a safe, risk-consistent among structural and nonstructural members and cost-eff ective design.
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Luigi Di Sarno,George Karagiannakis 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.1
The investigation of the seismic integrity of petrochemical plant steel structures should be commensurable to their importance given the high necessity for human life safety and fi nancial robustness. To date, it is demonstrated in the existing literature that still many grey areas of knowledge exist upon the appropriate application of code provisions on non-building structures design. Indeed, the selection of seismic design parameters such as system performance factors or important classes are still vague aspects, in contrast with those for common building structures, either because of the paucity of information of seismic codes or due to the structural peculiarities that characterise the industrial structures resulting in the diffi culty of defi ning ‘all-encompassing’ design parameters. The present paper aims at highlighting those parameters considering also a case-study that pertains to a steel pipe rack. The pipe rack is designed and analysed in the linear and nonlinear regime, both statically and dynamically, according to the Italian and European codes. American code provisions are examined as well so as possible inconsistencies might be found. It is demonstrated that the common nonlinear static analysis (pushover analysis) cannot be used to assess the response of the rack and the behaviour factor selection from current standards could be unjustifi able. Also, common engineering demand parameters, e.g. interstorey drift ratio, need further assessment vis-à-vis the response of nonstructural components of which the current design method does not comply with modern methods.
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