Determination of the secondary bending stress in cold-formed steel connection
- Apai Benchaphong, Department of Civil Engineering, Faculty of Engineering, Rajamangala University of Technology Krungthep, Bangkok 10120, Thailand
- Rattanasak Hongthong, Department of Civil Engineering, Faculty of Engineering, Rajamangala University of Technology Krungthep, Bangkok 10120, Thailand
- Sutera Benchanukrom, Faculty of Agricultural Technology and Industrial Technology, Phetchabun Rajabhat University Petchabun, Petchabun 76000, Thailand
- Nirut Konkong, Irrigation Office 3 - Royal Irrigation Department, Phitsanulok 65000, Thailand, Corresponding author; email@example.com
The purpose of this analysis was to study the effect of bolt load transfers and geometric variables which influence the secondary bending stress factor of cold-formed steel bolt connections using the analytical method. The Neutral Line Concept (NLC) was a method for determining the effect of secondary bending in bolt connection, but some important factors were ignored, such as load transmission occurring at the middle row bolts, overlap stiffening due to the action of manufactured and bolt stiffness. There was an effect on the level of the secondary bending stress in the bolt-row. To obtain accurately the secondary bending stress factor, the Modified Neutral Line Concept (MNLC) was proposed. MNLC was modified from NLC by added ignoring factors to the process of calculating. The accuracy of MNLC was validated by finite element analysis. The results showed that the analytical method had a good correlation with the finite element analysis. The most critical points for secondary bending stress in a lap shear connection were in the outer bolt rows of the connection.
A325M-94. (1994). High strength bolts for structural steel joints [Metric], ASTM International, West Conshohocken, PA, 19428-2959 USA. www.astm.org
ANSYS. (2014). ANSYS user’s manual Revision 15, ANSYS, Inc.
ASTM A370-07. (2007). Standard Test Methods and Definitions for Mechanical Testing of Steel Products, ASTM International, West Conshohocken, PA, 19428-2959 USA. www.astm.org
Chanamai, P., & Rodkwan, S. (2019). Numerical simulation of gas-solid flow in a cement precalciner using adaptive mesh refinement. Journal of Current Science and Technology, 9(2), 107-122. DOI: 10.14456/jcst.2019.11
Chung, K. F., & Ip, K. H. (2000). A general design rule for bearing failure of bolted connections between cold-formed Steel Strips. International Specialty Conference on Cold-Formed Steel Structures, 593-605.
De Rijck, J. J. M. (2005). Stress analysis of fatigue cracks in mechanically fastened joints: An analytical and experimental investigation (Doctoral thesis, Delft University of Technology, The Netherlands). Publisher Delft University Press 316 pp. Retrieved from https://www.narcis.nl/publication/RecordID/oai:tudelft.nl:uuid:c6253348-532d-4159-bb4c-00cb8a1f5c2b
Egan, B. T., McCarthy, C., McCarthy, M. A., & Frizzell, R. F. (2012). Stress analysis of single-bolt, single-lap, countersunk composite joints with variable bolt-hole clearance. Composite Structures, 94(3), 1038-1051. DOI: 10.1016/j.compstruct.2011.10.004
Ekh, J., & Schön, J. (2005). Effect of secondary bending on strength prediction of composite, single shear lap joints. Composites Science and Technology, 65(6), 953-965. DOI: https://doi.org/10.1016/j.compscitech.2004.10.020
Ekh, J., Schon, J., & Melin, L. G. (2005). Secondary bending in multi-fastener composite-to aluminum single shear lap joints. Composites Part B: Engineering, 36(3), 195-208. DOI: https://doi.org/10.1016/j.compositesb.2004.09.001
Hart-Smith, L. J. (1985). Bonded-bolted composite joints. Journal of Aircraft, 22(11), 993-1000. DOI: https://doi.org/10.2514/3.45237
Ireman, T. (1998). Three-dimensional stress analysis of bolted single-lap composite joints. Composite Structures, 43(3), 195-216. DOI: https://doi.org/10.1016/S0263-8223(98)00103-2
Konkong, N., & Phuvoravan, K. (2017a). An analytical method for determining the load distribution of single-column multi bolt connection. Advances in Civil Engineering. DOI: 10.1155/2017/1912724.
Konkong, N., & Phuvoravan, K. (2017b). Parametric study for bearing strength in cold-formed steel bolt connections. International Review of Civil Engineering (I.RE.C.E.), 8(3), 87-96. DOI: 10.15866/irece.v8i3.11850.
Machniewicz, T., Korbel, A., Skorupa, M., & Winter, J. (2018). Analytical, numerical and experimental investigation of the secondary bending of riveted lap joints. AIP Conference Proceedings. Volume 2028, Issue 1. DOI: https://doi.org/10.1063/1.5066400
Schijve, J. (1972). Some elementary calculations on secondary bending in simple lap joints, Report NLR TR 72036, Amsterdam (Netherlands): NLR. National Technical Reports Library, https://ntrl.ntis.gov/NTRL/dashboard/searchResults/titleDetail/N7231911.xhtml
Skorupa, M., Korbel, A., Skorupa, A., & Machniewicz, T. (2015). Observations and analyses of secondary bending for riveted lap joints. International Journal of Fatigue, 72, 1-10. DOI:
Starikov, R. (2002). Mechanically fastened joints - Critical testing of single overlap joints
Scientific Report FOI-R-0441-SE. Stockholm, Swedish Defense Research Agency, Aeronautics Division, FAA
Timoshenko, S. P (1922). LXVI. On the correction for shear of the differential equation for transverse vibrations of prismatic bars,” Philosophical Magazine, 41, 744-746. DOI: https://doi.org/10.1080/14786442108636264