Analysis of Nonbuilding Structures Connected by Large Diameter Pipe while Subjected to Seismic Loads

Wey, Eric; Naqvi, Dawar; Glasscock, David; Sepaha, Ankur

doi:10.1061/41171(401)210

Cited by 2 publications

(2 citation statements)

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“…The error is less than 10 percent and is due to the ASCE 7 design response spectrum break at Ts = 0.45 seconds in this example falling in between Tc = 0.217 seconds and TG = 0.664 seconds causing a drop in base shear. This issue with the effects of the design response spectrum has been documented in other works [see Wey et al (2011)] where changes in the base shear ratio graphs are accounted for by the structural period of the more flexible structure being greater than Ts. The example in this paper are regular structures with dominant fundamental natural periods.…”

Section: Resultsmentioning

confidence: 75%

Examples of Triggers for Combined Seismic Analysis of Stacked Industrial Structures

Wey¹,

Mejia²,

Litoff³

2020

Structures Congress 2020

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Petrochemical facilities frequently have large equipment supported by equally large nonbuilding structures. Examples of stacked nonbuilding structures in petroleum refineries include coker structures, vacuum tower structures, and fluidized catalyst cracking reactor and regenerator structures. Some of these stacked nonbuilding structures have a supported structure with a fundamental period that is larger than the fundamental period of the supporting structure. Examples are provided that show that when the ratio of fundamental periods is greater than two, then the supported structure can be decoupled and analyzed as if it were supported on a rigid base. In other stacked nonbuilding structures, such as elevated compressors supported by a reinforced concrete tabletop structure, the fundamental period of the supported structure is low compared to the fundamental period of the supporting structure. An established trigger for combined analysis of stacked structures is when the ratio of the supported structure weight to the combined weight of both structures is greater than twenty percent. Examples are provided that show that when the ratio of fundamental period is less than one half, then the supporting structure can be decoupled and analyzed as if there were a rigid mass on top of the supporting structure. The provided examples illustrate that decoupling triggers based upon natural frequency ratios are reliable for stacked structures.

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Section: Resultsmentioning

confidence: 75%

Examples of Triggers for Combined Seismic Analysis of Stacked Industrial Structures

Wey¹,

Mejia²,

Litoff³

2020

Structures Congress 2020

Self Cite

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show abstract

“…Based on the studies, it was suggested that the strength and stiffness of the connecting truss be improved due to its large vertical acceleration under strong earthquakes. In a more related work [Wey et al ., ], among the very few studies spotted, three methods of seismic analysis of two nonbuilding structures connected by a large diameter pipe were compared. In the first method, the two structures were analysed independently, and the loads arising from seismic displacements of an independent pipe model were included.…”

Section: Introductionmentioning

confidence: 99%

A method for rapid estimation of dynamic coupling and spectral responses of connected adjacent structures

Behnamfar

Dorafshan

Taheri

et al. 2015

Structural Design Tall Build

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A simple method is presented for estimation of dynamic coupling and maximum seismic responses of structures connected through links. The purpose is preparing a simple measure for distinguishing the cases where two connected structures interfere in the response of each individual structure and incorporating such cases in spectral analysis. First, each structure is analysed independently, and the natural modes with considerable interference with the other structure are identified. Then the spectral responses corresponding to such modes are modified in modal space. It is shown that the proposed method can estimate the spectral responses of adjacent systems with good accuracy.On the main diagonal, mk = 1 and no interaction exists. 614 F. BEHNAMFAR ET AL.dynamic response considerably, and second, they can be analysed separately at a preliminary design stage including the effect of the adjacent system if needed. Therefore, this method can reduce the time of the whole design process of such systems considerably. The splitting method was derived for two SDF systems and then was extended to two MDF systems connected at any level. The results of spectral analyses of the sample systems illustrated good accuracy in estimation of the maximum lateral displacements of each connected structure when analysed separately. AUTHORS' BIOGRAPHIESFarhad Behnamfar is a faculty member at the Isfahan University of Technology, Iran, from 2003.

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Analysis of Nonbuilding Structures Connected by Large Diameter Pipe while Subjected to Seismic Loads

Cited by 2 publications

References 1 publication

Examples of Triggers for Combined Seismic Analysis of Stacked Industrial Structures

Examples of Triggers for Combined Seismic Analysis of Stacked Industrial Structures

A method for rapid estimation of dynamic coupling and spectral responses of connected adjacent structures

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