Effect of local small diameter stud connectors on behavior of partially encased composite beams

- Journal title : Steel and Composite Structures
- Volume 20, Issue 2, 2016, pp.251-266
- Publisher : Techno-Press
- DOI : 10.12989/scs.2016.20.2.251

Title & Authors

Effect of local small diameter stud connectors on behavior of partially encased composite beams

Nguyen, Giang Bergerova; Machacek, Josef;

Nguyen, Giang Bergerova; Machacek, Josef;

Abstract

The paper combines two distinct parts. First the behavior of welded headed studs with small diameters of 10 and 13 mm acting as shear connectors (which are not embraced in current standards) is studied. Based on standard push tests the load-slip relationships and strengths are evaluated. While the current standard (Eurocode 4 and AISC) formulas used for such studs give reasonable but too conservative strengths, less conservative and full load-slip rigidities are evaluated and recommended for a subsequent investigation or design. In the second part of the paper the partially encased beams under bending are analyzed. Following former experiments showing rather indistinct role of studs used for shear connection in such beams their role is studied. Numerical model employing ANSYS software is presented and validated using former experimental data. Subsequent parametric studies investigate the longitudinal shear between steel and concrete parts of the beams with respect to friction at the steel and concrete interface and contribution of studs with small diameters required predominantly for assembly stages (concreting). Substantial influence of the friction and effect of concrete confinement was observed with rather less noticeable contribution of the studs. Distribution of the longitudinal shear and its sharing between friction and studs is presented with concluding remarks.

Keywords

composite beams;nonlinear behavior;numerical modeling;partially encased beams;push-out tests;shear transfer;small studs;

Language

English

References

1.

Assi, I.M., Abed, S.M. and Hunaiti, Y.M. (2002), "Flexural strength of composite beams partially encased in lightweight concrete", J. Appl. Sci., 2(3), 320-323.

2.

Begum, M. and Ghosh, D. (2014), "Simulations of PEC columns with equivalent steel section under gravity loading", Steel Compos. Struct., Int. J., 16(3), 305-323.

3.

Begum, M., Driver, R.G. and Elwi, A.E. (2007), "Finite-element modeling of partially encased composite columns using the dynamic explicit method", J. Struct. Eng., ASCE, 133(3), 326-334.

4.

Chen, Y., Wang, T., Yang, J. and Zhao, X (2010), "Test and numerical simulation of partially encased composite columns subject to axial and cyclic horizontal loads", Int. J. Steel Struct., 10(4), 385-393.

5.

Chicoine, T., Tremblay, R. and Massicotte, B. (2002), "Finite element modelling and design of partially encased composite columns", Steel Compos. Struct., Int. J., 2(3), 171-194.

6.

De Nardin, S. and El Debs, A.L.H.C. (2009), "Study of partially encased composite beams with innovative position of stud bolts", J. Construct. Steel Res., 65(2), 342-350.

7.

Elghazouli, A.Y. and Treadway, J. (2008), "Inelastic behaviour of composite members under combined bending and axial loading", J. Construct. Steel Res., 64(9), 1008-1019.

8.

Elnashai, A.S., Takanashi, K., Elghazouli, A.Y. and Dowling, P.J. (1991), "Experimental behaviour of partially encased composite beam-columns under cyclic and dynamic loads", Proc. Inst. Civil Engrs., 91(2), 259-272.

9.

EN 1994-1-1 (2004), Eurocode 4, Design of composite steel and concrete structures-Part 1-1: General rules and rules for buildings, CEN.

10.

Hanna, E.M. and Amin, A.E-M.M. (2006), "Strength assessment of axially loaded partially encased composite columns", Proceedings of the 31st Conference on Our World in Concrete & Structures, Singapore, August.

11.

Hanswille, G. (2008), "Eurocode 4, composite columns", Eurocodes Background and Applications, Disseminations of information for training, Brussels, Belgium, February.

12.

Hegger, J. and Goralski, C. (2005), "Structural behaviour of partially concrete encased composite sections with high strength concrete", Proceedings of the 5th International Conference in Composite Construction in Steel and Concrete, Kruger National Park, South Africa, July.

13.

Johnson, R.P. and Oehlers, D.J. (1981), "Analysis and design for longitudinal shear in composite T-beams", Proc. Inst. Civil Emgrs., 71(4), 989-1021.

14.

Kindmann, R., Bergmann, R., Cajot, L.G. and Schleich, J.B. (1993), "Effect of reinforced concrete between the flanges of the steel profile of partially encased composite beams", J. Construct. Steel Res., 27(1-3), 107-122.

15.

Kuhlmann, U. and Kurschner, K. (2005), "Structural behaviour of horizontally lying shear studs", Proceedings of the 5th International Conference in Composite Construction in Steel and Concrete, Kruger National Park, South Africa, July.

16.

Kvocak, V. and Drab, L. (2012), "Partially-encased composite thin-walled steel beams", Procedia Eng., 40, 91-95.

17.

Machacek, J. and Cudejko, M. (2009), "Longitudinal shear in composite steel and concrete trusses", Eng. Struct., 31(6), 1313-1320.

18.

Mirza, O. and Uy, B. (2009), "Effects of the combination of axial and shear loading on the behaviour of headed stud steel anchors", Eng. Struct., 32(1), 91-95.

19.

Mirza, O. and Uy, B. (2010), "Finite element model for the long-term behaviour of composite steel-concrete push tests", Steel Compos. Struct., Int. J., 10(1), 45-67.

20.

Oehlers, D.J. and Coughlan, C.G. (1986), "The shear stiffness of stud shear connections in composite beams", J. Construct. Steel Res., 6(4), 273-284.

21.

Okada, J., Yoda, T. and Lebet, J.P. (2006), "The study of the grouped arrangements of stud connectors on shear strength behavior", J. Structural Eng./Earthquake Eng., JSCE, 23(1), 75-89.

22.

Ollgaard, J.G., Slutter, R.G. and Fisher, J.W. (1971), "Shear strength of stud connectors in lightweight and normal-weight concrete", AISC Eng. J., 8(2), 55-64.

23.

Piloto, P.A.G., Mesquita, L.M.R. and Gavilan, A.R. (2006), "Ultimate limit state design for lateral torsional buckling of partially encased steel beams", Proceedings of the 5th International Conference on Mechanics and Materials in Design, Porto, Portugal, July.

24.

Shim, C.S. (2004), "Experiments on limit state design of large stud shear connectors", KSCE J. Civil Eng., 8(3), 313-318.

25.

Shukur, R.K. (2009), "Nonlinear analyses of partially composite steel beams encased in concrete with innovative position of stud bolts", J. Eng., 15(1), 3368-3390.

26.

Tremblay, R., Chicoine, T. and Massicotte, B. (2000), "Design equation for the axial load capacity of partially encased non-compact columns" Proceedings of Composite Construction in Steel and Concrete IV, Banff, Canada, June.