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Comparisons of design methods for beam string structure based on reliability and progressive collapse analysis

Hao Zhou, Youbao Jiang, Sondipon Adhikari, Qianqian Yin, Jianguo Cai

Structures, Volume: 33, Pages: 2166 - 2176

Swansea University Author: Sondipon Adhikari

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DOI (Published version): 10.1016/j.istruc.2021.05.085

Abstract

The current design method of ultimate capacity of beam string structure (BSS) is mainly based on the fixed load ratio (FLR) criterion, seldom considers the effect of the random load ratio (RLR) on bearing capacity. This paper compared the coefficient of variation (COV) of bearing capacity obtained b...

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Published in: Structures
ISSN: 2352-0124
Published: Elsevier BV 2021
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URI: https://cronfa.swan.ac.uk/Record/cronfa57082
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spelling 2021-06-30T14:22:04.8475525 v2 57082 2021-06-10 Comparisons of design methods for beam string structure based on reliability and progressive collapse analysis 4ea84d67c4e414f5ccbd7593a40f04d3 Sondipon Adhikari Sondipon Adhikari true false 2021-06-10 FGSEN The current design method of ultimate capacity of beam string structure (BSS) is mainly based on the fixed load ratio (FLR) criterion, seldom considers the effect of the random load ratio (RLR) on bearing capacity. This paper compared the coefficient of variation (COV) of bearing capacity obtained by RLR criterion with that obtained by the FLR criterion. It indicates that the random properties of load ratio have a significant impact on COV and should be accounted for. A more realistic limit state function is built with a practical simplification, which is proved to have a better accuracy by reliability verifications for typical cases. Parametric reliability analyses are also carried out with Monte Carlo simulations. The results show that the reliability with FLR criterion is larger than that with RLR criterion. Thus the reliability of BSS would be overestimated following the current design method, and an unsafe design would be resulted in, too. Three targeted reliability indexes are selected for representative cases. Two improved design methods with optimum load and resistance factors are obtained according to minimum differences between the calculated reliability indexes and targeted ones among cases. Finally, the performance of anti-progressive collapse of BSS designed by the two improved methods is compared when the strut or cable fails. The results show that the representative BSS designed by improved design method 2 with fixed load partial factors and optimum resistance factor, which varies with cases, has better performance of anti-progressive collapse. Journal Article Structures 33 2166 2176 Elsevier BV 2352-0124 Beam string structure, Random load ratio, Reliability analysis, Load and resistance factors, Progressive collapse 1 10 2021 2021-10-01 10.1016/j.istruc.2021.05.085 COLLEGE NANME Science and Engineering - Faculty COLLEGE CODE FGSEN Swansea University 2021-06-30T14:22:04.8475525 2021-06-10T09:28:32.4623670 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Hao Zhou 1 Youbao Jiang 2 Sondipon Adhikari 3 Qianqian Yin 4 Jianguo Cai 5 57082__20114__79db0e123f0c4edd9cc43582ee09e2ff.pdf 57082.pdf 2021-06-10T10:00:21.2421490 Output 9202250 application/pdf Accepted Manuscript true 2022-06-09T00:00:00.0000000 ©2021 All rights reserved. All article content, except where otherwise noted, is licensed under a Creative Commons Attribution Non-Commercial No Derivatives License (CC-BY-NC-ND) true eng http://creativecommons.org/licenses/by-nc-nd/4.0/
title Comparisons of design methods for beam string structure based on reliability and progressive collapse analysis
spellingShingle Comparisons of design methods for beam string structure based on reliability and progressive collapse analysis
Sondipon Adhikari
title_short Comparisons of design methods for beam string structure based on reliability and progressive collapse analysis
title_full Comparisons of design methods for beam string structure based on reliability and progressive collapse analysis
title_fullStr Comparisons of design methods for beam string structure based on reliability and progressive collapse analysis
title_full_unstemmed Comparisons of design methods for beam string structure based on reliability and progressive collapse analysis
title_sort Comparisons of design methods for beam string structure based on reliability and progressive collapse analysis
author_id_str_mv 4ea84d67c4e414f5ccbd7593a40f04d3
author_id_fullname_str_mv 4ea84d67c4e414f5ccbd7593a40f04d3_***_Sondipon Adhikari
author Sondipon Adhikari
author2 Hao Zhou
Youbao Jiang
Sondipon Adhikari
Qianqian Yin
Jianguo Cai
format Journal article
container_title Structures
container_volume 33
container_start_page 2166
publishDate 2021
institution Swansea University
issn 2352-0124
doi_str_mv 10.1016/j.istruc.2021.05.085
publisher Elsevier BV
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
active_str 0
description The current design method of ultimate capacity of beam string structure (BSS) is mainly based on the fixed load ratio (FLR) criterion, seldom considers the effect of the random load ratio (RLR) on bearing capacity. This paper compared the coefficient of variation (COV) of bearing capacity obtained by RLR criterion with that obtained by the FLR criterion. It indicates that the random properties of load ratio have a significant impact on COV and should be accounted for. A more realistic limit state function is built with a practical simplification, which is proved to have a better accuracy by reliability verifications for typical cases. Parametric reliability analyses are also carried out with Monte Carlo simulations. The results show that the reliability with FLR criterion is larger than that with RLR criterion. Thus the reliability of BSS would be overestimated following the current design method, and an unsafe design would be resulted in, too. Three targeted reliability indexes are selected for representative cases. Two improved design methods with optimum load and resistance factors are obtained according to minimum differences between the calculated reliability indexes and targeted ones among cases. Finally, the performance of anti-progressive collapse of BSS designed by the two improved methods is compared when the strut or cable fails. The results show that the representative BSS designed by improved design method 2 with fixed load partial factors and optimum resistance factor, which varies with cases, has better performance of anti-progressive collapse.
published_date 2021-10-01T04:12:33Z
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score 11.036116

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