Cold-Formed Cross-Sectional Folds with Optimal Signature CurveSource: Journal of Engineering Mechanics:;2024:;Volume ( 150 ):;issue: 008::page 04024045-1Author:Babak Ahmadi
,
Shayan Razi
,
Mohammad P. Saghand
,
Navid Changizi
,
Arash S. Fallah
,
Mazdak Tootkaboni
DOI: 10.1061/JENMDT.EMENG-7708Publisher: American Society of Civil Engineers
Abstract: A novel figure of merit based on the concept of signature curve for cold formed steel (CFS) cross sections is used to improve the structural member’s overall behavior regardless of length and boundary conditions. The objective is defined as the area under the signature curve, plus a penalty function that ensures improved performance over standard sections at specified lengths. Charged system search (CSS), a meta-heuristic optimization algorithm, is used to search the design space. End-use and other geometrical constraints suggested by previous studies are considered to arrive at practical cross sections. This includes limiting the fold angles to minimize sharp corners in the optimized cross sections, which might result in residual stresses that diminish axial capacity. Such nonlinear constraints are also taken into account using penalty functions to facilitate integration with the heuristic optimization process. The proposed strategy is examined through a couple of illustrative examples and is shown to yield higher axial capacity at all points when combined with the proper penalization. The optimized cross sections are also analyzed in simple-simple and clamped-clamped boundary conditions showing improved axial capacity compared to the standard lipped-channel sections with the same coil width.
|
Collections
Show full item record
contributor author | Babak Ahmadi | |
contributor author | Shayan Razi | |
contributor author | Mohammad P. Saghand | |
contributor author | Navid Changizi | |
contributor author | Arash S. Fallah | |
contributor author | Mazdak Tootkaboni | |
date accessioned | 2024-12-24T10:25:46Z | |
date available | 2024-12-24T10:25:46Z | |
date copyright | 8/1/2024 12:00:00 AM | |
date issued | 2024 | |
identifier other | JENMDT.EMENG-7708.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4298903 | |
description abstract | A novel figure of merit based on the concept of signature curve for cold formed steel (CFS) cross sections is used to improve the structural member’s overall behavior regardless of length and boundary conditions. The objective is defined as the area under the signature curve, plus a penalty function that ensures improved performance over standard sections at specified lengths. Charged system search (CSS), a meta-heuristic optimization algorithm, is used to search the design space. End-use and other geometrical constraints suggested by previous studies are considered to arrive at practical cross sections. This includes limiting the fold angles to minimize sharp corners in the optimized cross sections, which might result in residual stresses that diminish axial capacity. Such nonlinear constraints are also taken into account using penalty functions to facilitate integration with the heuristic optimization process. The proposed strategy is examined through a couple of illustrative examples and is shown to yield higher axial capacity at all points when combined with the proper penalization. The optimized cross sections are also analyzed in simple-simple and clamped-clamped boundary conditions showing improved axial capacity compared to the standard lipped-channel sections with the same coil width. | |
publisher | American Society of Civil Engineers | |
title | Cold-Formed Cross-Sectional Folds with Optimal Signature Curve | |
type | Journal Article | |
journal volume | 150 | |
journal issue | 8 | |
journal title | Journal of Engineering Mechanics | |
identifier doi | 10.1061/JENMDT.EMENG-7708 | |
journal fristpage | 04024045-1 | |
journal lastpage | 04024045-13 | |
page | 13 | |
tree | Journal of Engineering Mechanics:;2024:;Volume ( 150 ):;issue: 008 | |
contenttype | Fulltext |