I-girder with discrete torsional bracings: Lateral-torsional buckling and torsional vibration

C. T. Nguyen, H. E. Lee

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Discrete torsional bracing systems are widely used in practice to increase the strength of Igirders bridges. This paper presents equations for lateral-torsional buckling strength, torsional natural frequency and stiffness requirements of I-girders with discrete torsional bracings. Firstly, the equations to calculate the critical moment of the I-girder with discrete torsional bracings are introduced. An equivalent moment factor C b in terms of the number of bracing points is proposed for I-girder subjected to linear moment gradient when full bracing is provided. The equations to calculate the torsional natural frequency are also presented in the same manner. The proposed equations are then compared with the results of finite element analyses and those from previous studies. From the results, it is found that proposed equations agree well with results of finite element analyses regardless of the number of bracing points. Finally, the reduced formula for the total torsional stiffness requirement is proposed for the design purpose.

Original languageEnglish
Title of host publicationBridge Maintenance, Safety, Management and Life-Cycle Optimization - Proceedings of the 5th International Conference on Bridge Maintenance, Safety and Management
Pages2703-2708
Number of pages6
Publication statusPublished - 2010
Event5th International Conference on Bridge Maintenance, Safety and Management, IABMAS 2010 - Philadelphia, PA, United States
Duration: 2010 Jul 112010 Jul 15

Publication series

NameBridge Maintenance, Safety, Management and Life-Cycle Optimization - Proceedings of the 5th International Conference on Bridge Maintenance, Safety and Management

Other

Other5th International Conference on Bridge Maintenance, Safety and Management, IABMAS 2010
CountryUnited States
CityPhiladelphia, PA
Period10/7/1110/7/15

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Building and Construction

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  • Cite this

    Nguyen, C. T., & Lee, H. E. (2010). I-girder with discrete torsional bracings: Lateral-torsional buckling and torsional vibration. In Bridge Maintenance, Safety, Management and Life-Cycle Optimization - Proceedings of the 5th International Conference on Bridge Maintenance, Safety and Management (pp. 2703-2708). (Bridge Maintenance, Safety, Management and Life-Cycle Optimization - Proceedings of the 5th International Conference on Bridge Maintenance, Safety and Management).