Refined Analysis of Fatigue Crack Initiation Life of Beam-to-Column Welded Connections of Steel Frame under Strong Earthquake

This paper presents a refined analysis for evaluating low-cycle fatigue crack initiation life of welded beam-to-column connections of steel frame structures under strong earthquake excitation. To consider different length scales between typical beam and column components as well as a few crucial bea...

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Main Authors: Weilian Qu, Ernian Zhao, Qiang Zhou
Format: Article
Language:English
Published: Wiley 2017-01-01
Series:Shock and Vibration
Online Access:http://dx.doi.org/10.1155/2017/7946286
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author Weilian Qu
Ernian Zhao
Qiang Zhou
author_facet Weilian Qu
Ernian Zhao
Qiang Zhou
author_sort Weilian Qu
collection DOAJ
description This paper presents a refined analysis for evaluating low-cycle fatigue crack initiation life of welded beam-to-column connections of steel frame structures under strong earthquake excitation. To consider different length scales between typical beam and column components as well as a few crucial beam-to-column welded connections, a multiscale finite element (FE) model having three different length scales is formulated. The model can accurately analyze the inelastic seismic response of a steel frame and then obtain in detail elastoplastic stress and strain field near the welded zone of the connections. It is found that the welded zone is subjected to multiaxial nonproportional loading during strong ground motion and the elastoplastic stress-strain field of the welded zone is three-dimensional. Then, using the correlation of the Fatemi-Socie (FS) parameter versus fatigue life obtained by the experimental crack initiation fatigue data of the structural steel weldment subjected to multiaxial loading, the refined evaluation approach of fatigue crack initiation life is developed based on the equivalent plastic strain at fatigue critical position of beam end seams of crucial welded connections when the steel frame is subjected to the strong earthquake excitation.
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publishDate 2017-01-01
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series Shock and Vibration
spelling doaj-art-d1389311217148ceb5514b4b9f8e73e02025-02-03T01:24:20ZengWileyShock and Vibration1070-96221875-92032017-01-01201710.1155/2017/79462867946286Refined Analysis of Fatigue Crack Initiation Life of Beam-to-Column Welded Connections of Steel Frame under Strong EarthquakeWeilian Qu0Ernian Zhao1Qiang Zhou2Hubei Key Laboratory of Roadway Bridge and Structure Engineering, Wuhan University of Technology, Wuhan, Hubei 430070, ChinaHubei Key Laboratory of Roadway Bridge and Structure Engineering, Wuhan University of Technology, Wuhan, Hubei 430070, ChinaHubei Key Laboratory of Roadway Bridge and Structure Engineering, Wuhan University of Technology, Wuhan, Hubei 430070, ChinaThis paper presents a refined analysis for evaluating low-cycle fatigue crack initiation life of welded beam-to-column connections of steel frame structures under strong earthquake excitation. To consider different length scales between typical beam and column components as well as a few crucial beam-to-column welded connections, a multiscale finite element (FE) model having three different length scales is formulated. The model can accurately analyze the inelastic seismic response of a steel frame and then obtain in detail elastoplastic stress and strain field near the welded zone of the connections. It is found that the welded zone is subjected to multiaxial nonproportional loading during strong ground motion and the elastoplastic stress-strain field of the welded zone is three-dimensional. Then, using the correlation of the Fatemi-Socie (FS) parameter versus fatigue life obtained by the experimental crack initiation fatigue data of the structural steel weldment subjected to multiaxial loading, the refined evaluation approach of fatigue crack initiation life is developed based on the equivalent plastic strain at fatigue critical position of beam end seams of crucial welded connections when the steel frame is subjected to the strong earthquake excitation.http://dx.doi.org/10.1155/2017/7946286
spellingShingle Weilian Qu
Ernian Zhao
Qiang Zhou
Refined Analysis of Fatigue Crack Initiation Life of Beam-to-Column Welded Connections of Steel Frame under Strong Earthquake
Shock and Vibration
title Refined Analysis of Fatigue Crack Initiation Life of Beam-to-Column Welded Connections of Steel Frame under Strong Earthquake
title_full Refined Analysis of Fatigue Crack Initiation Life of Beam-to-Column Welded Connections of Steel Frame under Strong Earthquake
title_fullStr Refined Analysis of Fatigue Crack Initiation Life of Beam-to-Column Welded Connections of Steel Frame under Strong Earthquake
title_full_unstemmed Refined Analysis of Fatigue Crack Initiation Life of Beam-to-Column Welded Connections of Steel Frame under Strong Earthquake
title_short Refined Analysis of Fatigue Crack Initiation Life of Beam-to-Column Welded Connections of Steel Frame under Strong Earthquake
title_sort refined analysis of fatigue crack initiation life of beam to column welded connections of steel frame under strong earthquake
url http://dx.doi.org/10.1155/2017/7946286
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AT ernianzhao refinedanalysisoffatiguecrackinitiationlifeofbeamtocolumnweldedconnectionsofsteelframeunderstrongearthquake
AT qiangzhou refinedanalysisoffatiguecrackinitiationlifeofbeamtocolumnweldedconnectionsofsteelframeunderstrongearthquake