Vol. 21 No. 3 (2018) Cover Image
Vol. 21 No. 3 (2018)

Published: September 30, 2018

Pages: 356-367

Articles

Analytical Modeling and Results Evaluation of Composite Open Web Steel Joists Behavior

Ali Farhan Hadeed 1 Laith Khalid Al-Hadithy 2 Riyadh J. Aziz 3
1 Building and Construction Technology Eng. Dep., Al-Esra'a University College, Baghdad, IRAQ
2 Civil Engineering Dep., Al-Nahrain University, Baghdad, IRAQ
3 Architecture Dep., Al- Esra'a University College, Baghdad, IRAQ
History
  • Received: October 26, 2017
  • Revised: January 23, 2018
  • Accepted: April 30, 2018
  • Available Online: September 1, 2018
DOI

https://doi.org/10.29194/NJES.21030356

Abstract

In this study, the analytic model (Azmi Model) had been considered for computation the load capacities of the composite open web steel joists and compared them with those obtained from experimental tests. The capacities of seven joists had been studied, each including one of the following variables (distribution of headed studs, connection degree of the connectors, inclination of the web, shape of the web, density of slab concrete, length of connectors).Theoretically, according to the Analytic model, the referenced joist of (45° web inclination , uniformly distributed ,over connected ,short headed studs) exhibited maximum load capacity of (18.45) ton, while the joist of (45° web inclination, uniformly distributed, under connected, short headed studs) exhibited minimum load capacity of (16.23) ton at yield point of bottom chord. Experimentally, the referenced joist exhibited maximum load capacity of (15.51) ton, while the joist of (34° web inclination, uniformly distributed, over connected, short headed studs) exhibited (12.49) ton load capacity. The load capacities values of the tested joists ranged between (67%-85%) of the predicted values according to the analytic model.

Keywords

References

  1. Supplement No 1, "Standard specifications for Composite steel Joists and code of standard practice", Steel Joist Institute (SJI), Vol. 32, December, 2010.
  2. David Samuelson, "Composite Steel Joists", Engineering Journal / Third Quarter, 2002, 111 p.
  3. Azmi, M. H., "Composite Open-Web Trusses with Metal Cellular Floor", M.Sc. Thesis, McMaster University, Hamilton, Ontario, Canada, April, 1972.
  4. Douglas F. Lauer, "Ultimate strength analysis of composite and fully composite open-web steel joists", M.Sc. Thesis, Virginia Polytechnic Institute and State University, October, 1994.
  5. BS 5950: Part 3: Section 3.1, "Code of Practice for Design of Simple and Continuous Composite Beams", British Standards Institution, London, 1990.
  6. Cran, J. A., "Design and Testing Composite Open Web Steel Joists", Proc. First Specialized Conference on Cold–Formed Steel Structures, University of Missouri, MO., 1971, pp. 186-197.
  7. Gibbings, D. R. and Easterling, W. S., "Strength of Composite Long Span Joists", Report CE/VPI–ST91/02, Department of Civil and Environmental Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA, 1991.