TY - GEN
T1 - I-girder with discrete torsional bracings
T2 - 5th International Conference on Bridge Maintenance, Safety and Management, IABMAS 2010
AU - Nguyen, C. T.
AU - Lee, H. E.
PY - 2010
Y1 - 2010
N2 - 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.
AB - 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.
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M3 - Conference contribution
AN - SCOPUS:84863056820
SN - 9780415877862
T3 - Bridge Maintenance, Safety, Management and Life-Cycle Optimization - Proceedings of the 5th International Conference on Bridge Maintenance, Safety and Management
SP - 2703
EP - 2708
BT - Bridge Maintenance, Safety, Management and Life-Cycle Optimization - Proceedings of the 5th International Conference on Bridge Maintenance, Safety and Management
Y2 - 11 July 2010 through 15 July 2010
ER -