Seismic performance assessment of fixed offshore structures by endurance time method

Diznab, Mohammad Ali Dastan; Mehdigholi, Hamid; Seif, Mohammad Saeed

doi:10.1080/17445302.2018.1554325

Cited by 8 publications

(5 citation statements)

References 21 publications

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“…Hence, if a structure is excited using ETEFs, the EDPs at different seismic intensities can be estimated by tracing the response over time. The efficiency of the ET method has been examined in many research studies [97][98][99][100][101][102] on various engineering structures, demonstrating that this method can predict median of EDP versus IM of structures with acceptable accuracy and significantly lower computational demand than the conventional Incremental Dynamic Analysis (IDA) 103 method. However, the efficiency of the ET method in the following cases needs further studies: (1) existing concrete frames with very low ductility and high deterioration rates designed prior to modern seismic codes, and (2) seismic analysis under near-field earthquakes and mainshock-aftershock sequences.…”

Section: Endurance Time Methodsmentioning

confidence: 99%

Life cycle cost‐based optimization framework for seismic design and target safety quantification of dual steel buildings with buckling‐restrained braces

Amiri

Estekanchi

2023

Earthq Engng Struct Dyn

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This study proposes an efficient risk‐targeted framework for integrated optimal seismic design and quantifying target safety of Special Moment‐Resisting Frames (SMRFs) with Buckling‐Restrained Braces (BRBs) in the typical dual steel buildings. This framework provides an automated design procedure formulated as a constrained single‐objective optimization problem to achieve the minimum Life Cycle Cost (LCC) within the Particle Swarm Optimization (PSO) algorithm and can be the basis of current seismic codes for target safety calibration. LCC includes initial construction cost and lifetime seismic losses such as repair cost, repair time, and casualties. FEMA P‐58 methodology is employed for the LCC analysis of the building under possible earthquakes during its lifetime, which is able to take into account potential uncertainties in the hazard‐response‐damage‐loss relationship. An appropriate cost model is developed to estimate the initial and repair cost of the studied BRBs. Minimum requirements of ASCE and AISC codes are considered as design constraints. Nonlinear response history analysis through the Endurance Time (ET) method is utilized to estimate the structural responses versus seismic intensity. Three 4‐, 8‐, and 12‐story steel buildings with dual seismic force‐resisting system consisting of SMRF and BRB (called steel SMRF‐BRB) are selected as the case study. Each building is optimally designed with two approaches: (1) LCC‐based design within the proposed framework and (2) code‐based design to minimize initial construction cost. Comparison of optimized buildings with the two design approaches in terms of structural responses and seismic consequences demonstrates that fulfilling the minimum code requirements at a given seismic hazard level is not sufficient to minimize lifetime seismic losses of steel SMRF‐BRBs. This is because the optimal designs obtained from the code‐based approach are associated with damage concentration, irreparability, and high collapse probability, especially in seismic events more severe than the design level. The proposed LCC‐based approach provides useful information for improving the lifetime seismic performance of steel SMRF‐BRBs.

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Section: Endurance Time Methodsmentioning

confidence: 99%

Life cycle cost‐based optimization framework for seismic design and target safety quantification of dual steel buildings with buckling‐restrained braces

Amiri

Estekanchi

2023

Earthq Engng Struct Dyn

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“…Since the finite element modelling of aforementioned structures results in a considerably large number of solving equations, the ET method will be very efficient compared to the traditional time-history analysis. For this reason, Hasani et al (2017) and Dastan Diznab et al (2019) utilized the ET method to reduce a demanding computational time required for the analysis of offshore structures.…”

Section: Assessment Of Non-building Structuresmentioning

confidence: 99%

A state-of-knowledge review on the endurance time method

et al. 2020

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“…In addition, they did not consider any specific target spectrum to ground motions that is necessary for seismic assessment for certain sites. The recent studies on seismic assessments of jacket platforms investigated reliability against seismic and wave loading [28], dynamic characteristics under seismic loads [29], ground motion's sample size effect on fragility [30], seismic hazard assessments [31], development of multi-modal pushover procedure [32], seismic performance by endurance time method [33], and seismic fragility assessments [34]. Some recent studies illustrated the application of system survival signature [35] and reliability-based optimization [36].…”

Section: Introductionmentioning

confidence: 99%

Influence of Optimal Intensity Measures Selection in Engineering Demand Parameter of Fixed Jacket Offshore Platform

et al. 2021

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This research identifies the significant optimal intensity measures (IM) for seismic performance assessments of the fixed offshore jacket platforms. A four-legged jacket platform for the oil and gas operation is deployed to investigate the seismic performance. The jacket platform is applied with nonlinearly modeled using finite element (FE) software OpenSees. A total of 80 ground motions and 21 different IMs are incorporated for numerical analyses. Nonlinear time-history analyses are performed to obtain the jacket structure’s engineering demand parameters (EDP): peak acceleration and displacement at the top of the structure. Four important statistical parameters: practicality, efficiency, proficiency, and coefficient of determination, are then calculated to find the significant IMs for seismic performance of the jacket structure. The results show that acceleration-related IMs: effective design acceleration (EDA), A95 parameter, and peak ground acceleration (PGA) are optimal IMs, and the acceleration-related IMs have good agreements with the acceleration-related EDP.

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Seismic performance assessment of fixed offshore structures by endurance time method

Cited by 8 publications

References 21 publications

Life cycle cost‐based optimization framework for seismic design and target safety quantification of dual steel buildings with buckling‐restrained braces

Life cycle cost‐based optimization framework for seismic design and target safety quantification of dual steel buildings with buckling‐restrained braces

A state-of-knowledge review on the endurance time method

Influence of Optimal Intensity Measures Selection in Engineering Demand Parameter of Fixed Jacket Offshore Platform

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