Distortional buckling of I-steel concrete composite beams in negative moment area

다국어 초록 (Multilingual Abstract)

The predominant type of buckling that I-steel concrete composite beams experience in the negative moment area is distortional buckling. The key factors that affect distortional buckling are the torsional and lateral restraints by the bottom flange. This study thoroughly investigates the equivalent lateral and torsional restraint stiffnesses of the bottom flange of an I-steel concrete composite beam under negative moments. The results show a coupling effect between the applied forces and the lateral and torsional restraint stiffnesses of the bottom flange. A formula is proposed to calculate the critical buckling stress of the I-steel concrete composite beams under negative moments by considering the lateral and torsional restraint stiffnesses of the bottom flange. The proposed method is shown to better predict the critical bending moment of the I-steel composite beams. This article introduces an improved method to calculate the elastic foundation beams, which takes into account the lateral and torsional restraint stiffnesses of the bottom flange and considers the coupling effect between them. The results show a close match in results from the calculation method proposed in this paper and the ANSYS finite element method, which validates the proposed calculation method. The proposed calculation method provides a theoretical basis for further research on distortional buckling and the ultimate resistance of I-steel concrete composite beams under a variable axial force.

참고문헌 (Reference)

1 Bi, C., "Two-grid discontinuous Galerkin method for quasi-linear elliptic problems" 49 (49): 311-331, 2011

2 Atanackovic, T.M., "Theory of Elasticity for Scientists and Engineers" Springer-Verlag New York Inc. 2012

3 Zhou, W., "The distortional buckling calculation formula of the steel-concrete composite beams in the negative moment region" 29 (29): 446-450, 2012

4 Bradford, M.A., "Strength of compact steel beams with partial restraint" 53 (53): 183-200, 2000

5 Johnson, R.P., "Strength and stiffness of discrete U-frames in composite plate girders" 99 (99): 199-209, 1993

6 Johnson, R.P., "Stability of continuous composite plate girders with U-frame action" 99 (99): 187-197, 1993

7 Ronagh, H.R., "Progress in the methods of analysis of restricted distortional buckling of composite bridge girders" 3 (3): 141-148, 2001

8 Tinh, Q.B., "Meshfree Galerkin Kriging model for bending and buckling analysis of simply supported laminated composite plates" 10 (10): 1350011-, 2013

9 Bradford, M.A., "Lateral-Distortional buckling of steel I – Section members" 23 (23): 97-116, 1992

10 Goltermann, P., "Lateral distortional buckling: Predicting elastic critical stress" 114 (114): 1606-1625, 1988

11 Svensson, S.E., "Lateral buckling of beams analysed as elastically supported columns subject to a varying axial force" 5 (5): 179-193, 1985

12 Weston, G., "Lateral buckling in continuous composite bridge girders" 69 (69): 79-87, 1991

13 Vrcelj, Z., "Inelastic restrained distortional buckling of continuous composite Tbeams" 65 (65): 850-859, 2009

14 Bradford, M.A., "Inelastic buckling of composite bridge girders near internal supports" 83 (83): 143-159, 1987

15 Dekker, N.W., "Factors influencing the strength of continuous composite beams in negative bending" 34 (34): 161-185, 1995

16 Ye, J., "Elastic restrained distortional buckling of steel-concrete composite beams based on elastically supported column method" 13 (13): 1-29, 2013

17 Chen, W., "Elastic lateral and restrained distortional buckling of doubly symmetric I -beams" 10 (10): 983-1016, 2010

18 Jun Li, "Dynamic stiffness analysis of steel-concrete composite beams" 국제구조공학회 16 (16): 577-593, 2014

19 Johnson, R.P., "Distortional lateral buckling of unstiffened composite bridge girders" 1983

20 Johnson, P.R., "Distortional lateral buckling of continuous composite beams" 91 (91): 131-161, 1991

21 Bradford, M.A., "Distortional buckling solutions for continuous composite beams" 118 (118): 73-89, 1992

22 Bradford, M.A., "Distortional buckling of elastically restrained cantilevers" 47 (47): 3-18, 1998

23 Zhou, W., "Distortional buckling analysis of steel-concrete composite girders in negative moment area" 2014 (2014): 1-10, 2014

24 Lizhong Jiang, "Distortional and local buckling of steel-concrete composite box-beam" 국제구조공학회 14 (14): 243-265, 2013

25 Lawson, M.R., "Design of Haunched Composit e Beams in Buildings, Steel Construction Institution"

26 British Standards Institution, "Code of Practice for Design of Steel Bridge"

27 Champenoy, D., "Calculating the critical buckling force in compressed bottom flanges of steel-concrete composite bridges" 18 (18): 271-292, 2014

28 Bradford, M.A., "Buckling of elastically restrained beams with web distortions" 6 (6): 287-304, 1988

29 Bradford, M.A., "Buckling in continuous composite beams" 2 (2): 169-178, 2000

30 Williams, F.W., "Buckling curves for elastically supported columns with varying axial force, to predict lateral buckling of beams" 7 (7): 133-147, 1987

31 Fu, Y., "Analytical solutions of thermal buckling and postbuckling of symmetric laminated composite beams with various boundary conditions" 225 (225): 13-29, 2013

32 Kalkan, I., "A numerical and analytical study on distortional buckling of doubly-symmetric steel I-beams" 70 : 289-297, 2012

33 Wang, D., "A Hermite reproducing kernel Galerkin meshfree approach for buckling analysis of thin plates" 51 (51): 1013-1029, 2013