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Moment-less arches for reduced stress state. Comparisons with conventional arch forms
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Lewis, W. J. (Wanda J.), Russell, Justin and Li, Thomas (2021) Moment-less arches for reduced stress state. Comparisons with conventional arch forms. Computers & Structures, 251 . 106524. doi:10.1016/j.compstruc.2021.106524 ISSN 0045-7949.
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Official URL: https://doi.org/10.1016/j.compstruc.2021.106524
Abstract
This paper presents a study of two-pin arches of constant cross-section that are moment-less under statistically prevalent (permanent) load. The arches are defined by analytical form-finding previously reported in Lewis (2016) [1]. The work provides guidance regarding the solution process, and expressions for reactions and axial forces. New analytical results include the derivation of the arch length, and a method for finding co-ordinates of individual arch segments in pre-fabricated construction. The accuracy of the shape prediction for inextensible moment-less arches is good, compared to the results from elastic models. Case studies report on medium and large-span arches, with the latter resembling the iconic Hoover Dam arch. Comparative studies of the moment-less and conventional arch forms (mostly of parabolic configuration), are carried out using permanent and variable loads. Additionally, the Hoover Dam arch is analysed for a discrete load transfer from the deck. Circular arches are analysed for the permanent load only, and are shown to be extremely inefficient in load resistance. Moment-less arches are found to provide a minimal stress response to loading and require least amount of material – a feature observed in natural objects. These characteristics are important from a durability perspective – a key concern for our future infrastructure.
Item Type: | Journal Article | ||||||||
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Subjects: | T Technology > TA Engineering (General). Civil engineering (General) T Technology > TG Bridge engineering |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||||
Library of Congress Subject Headings (LCSH): | Arches, Arch bridges, Elastic analysis (Engineering), Elastic arches, Structural analysis (Engineering) | ||||||||
Journal or Publication Title: | Computers & Structures | ||||||||
Publisher: | Pergamon | ||||||||
ISSN: | 0045-7949 | ||||||||
Official Date: | 15 July 2021 | ||||||||
Dates: |
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Volume: | 251 | ||||||||
Article Number: | 106524 | ||||||||
DOI: | 10.1016/j.compstruc.2021.106524 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
Date of first compliant deposit: | 13 April 2021 | ||||||||
Date of first compliant Open Access: | 21 April 2022 | ||||||||
RIOXX Funder/Project Grant: |
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