A simplified risk-targeted decision model for the verification of the seismic performance of critical infrastructure components to the operational limit state

Celano, Francesca (author), Dolšek, Matjaž (author)

A simplified risk-targeted decision model for the verification of the seismic performance of infrastructurecomponents to the operational limit state is presented. It assumes linearity between the intensity measure andthe engineering demand parameter and requires the evaluation of the displacement demand for a hazard-tar-geted design earthquake and of the displacement capacity. The latter is defined as the ratio between the op-erational limit-state displacement and a risk-targeted safety factor, which depends on the seismicity of the re-levant location, on the randomness of the intensity measures causing the operational limit-state, and on theacceptable (target) probability of exceeding this limit state. In the paper, the theoretical background of risk-targeted safety factor is first explained, followed by a discussion on the sensitivity of the risk-targeted safetyfactor to the input parameters. The design procedure involving the simplified risk-targeted decision model isthen introduced and demonstrated by means of an example of a simple pipe rack located at a petrochemicalplant. Within the scope of the presented example, the operational limit-state displacement of the pipe rack isestimated on thebasis of the limit-statestrains of a pipe attached to the frame. The risk-targeted safety factor isthen evaluated, and the frame is designed. It is shown that the application of the proposed procedure isstraightforward once the operational limit-state displacement has been determined. The advantage of the pro-cedure is that the target risk is accounted for by the risk-targeted safety factor, which can be calculated withrespect to the importance of the equipment of the critical infrastructure. Additionally, the proposed decisionmodelcanbeeasilyadoptedbyengineers,becausetheseismicdemandiscalculatedbyanalogytotheEurocode.However,atthisstageoftheresearch,theapplicationoftheproposeddecisionmodelislimitedtostructuresthatdo not exhibit any significant nonlinear seismic response at the operational limit state, and to structures wherethe equal displacement rule applies.

• Language: English
• Keywords: civil engineering, engineering structures, earthquake engineering
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Publication status: Published
• Publication version: Author Accepted Manuscript
• Year: 2020
• Number of pages: Str. 1-14
• Numbering: letn. 204, Št. 110019
• PID: 20.500.12556/RUL-115061
• UDC: 624.042.7
• ISSN on article: 0141-0296
• DOI: 10.1016/j.engstruct.2019.110019
• COBISS.SI-ID: 9028961
• Publication date in RUL: 10.04.2020

Record is a part of a journal

• Title: Engineering structures
• Shortened title: Eng. struct.
• Publisher: Elsevier
• ISSN: 0141-0296
• COBISS.SI-ID: 7750666

Licences

• License: CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Description: The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
• Licensing start date: 10.04.2020

Secondary language

• Language: Slovenian
• Keywords: gradbeništvo, gradbene konstrukcije, potresno inženirstvo