Distortion-induced stress investigation of double angle stringer-to-floorbeam connections in railroad bridges

Robert C. Guyer, Jeffrey A. Laman

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Research has shown that double angle stringer-to-floorbeam connections in riveted railway bridges are susceptible to fatigue cracking caused by secondary, distortion-induced stress. This stress, caused by stringer end rotation is not easily calculable, therefore more detailed analysis techniques are needed to quantify connection behavior. The present study was initiated to determine the effect that connection parameters: (1) gage length of the outstanding angle leg, (2) angle depth, (3) angle thickness, and (4) stringer length have on moment-rotation behavior and stress concentrations from a typical 286,000 pound railcar load. Seventy-two unique double angle connection configurations were investigated using 3D and 2D finite element analysis software. Maximum principal stress in the connection angle was investigated in each analysis case and a subsequent stress prediction equation was developed through linear regression analysis. The proposed equation is a function of connection parameters and provides an easily calculable and effective method to predict the magnitude of stress range in connection angles. This facilitates fatigue life evaluation without the need for rigorous analysis.

Original languageEnglish (US)
Pages (from-to)104-112
Number of pages9
JournalEngineering Structures
Volume38
DOIs
StatePublished - May 1 2012

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Railroad bridges
Stringers
Fatigue of materials
Linear regression
Regression analysis
Gages
Stress concentration
Finite element method

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering

Cite this

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abstract = "Research has shown that double angle stringer-to-floorbeam connections in riveted railway bridges are susceptible to fatigue cracking caused by secondary, distortion-induced stress. This stress, caused by stringer end rotation is not easily calculable, therefore more detailed analysis techniques are needed to quantify connection behavior. The present study was initiated to determine the effect that connection parameters: (1) gage length of the outstanding angle leg, (2) angle depth, (3) angle thickness, and (4) stringer length have on moment-rotation behavior and stress concentrations from a typical 286,000 pound railcar load. Seventy-two unique double angle connection configurations were investigated using 3D and 2D finite element analysis software. Maximum principal stress in the connection angle was investigated in each analysis case and a subsequent stress prediction equation was developed through linear regression analysis. The proposed equation is a function of connection parameters and provides an easily calculable and effective method to predict the magnitude of stress range in connection angles. This facilitates fatigue life evaluation without the need for rigorous analysis.",
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Distortion-induced stress investigation of double angle stringer-to-floorbeam connections in railroad bridges. / Guyer, Robert C.; Laman, Jeffrey A.

In: Engineering Structures, Vol. 38, 01.05.2012, p. 104-112.

Research output: Contribution to journalArticle

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