Effect of Using Partial Continuounity by External Post-Tension on The Simple Composite Beams as a Strengthening Technique

A. M. EL-Shihy, H. F. Shabaan, H. M. Abd-Elkade, Ahmed I. Hassanin

Abstract


Composite steel-concrete beams are used widely in bridge and building
construction as the main structural elements in flexure. These structures have a
design life and this may be reduced if loads are increased or environmental
degradation occurs. Strength of such structure members and thus replacement or
retrofitting may need to be considered. One method of retrofitting (stiffening and
strengthening) a composite steel-concrete beam is to externally post-tension the
beam. The present study focuses on evaluating the effect of adding the external
post-tension as a strengthening technique on the simple composite beams. The
study was conducted using the finite element program "ANSYS". Nonlinear
material models for the components of the composite beam were used in the finite
element model. The outcomes got from finite element analysis were confirmed
against available experimental results. A broad parametric study was conducted to
explore the effect of tendons profiles on flexural behaviour. This covers: load
deflection behaviour, converting the simple beam into partially continuous beam,
verifying an external post-tensioned simple beam.


Full Text:

PDF

References


K. Abdel Aziz, “Modélisation et étude expérimental de pouters mixtes acier-béton à connexion partielle ou espacée”, Ph.D. Thesis, Institut National des Sciences Appliquées des Rennes, Rennes, France (in French),1986.

B. M. Ayyub, Y. G. Sohn and H. Saadatmanesh, “Prestressed composite girders under positive moment”, Journal of Structural Engineering Vol. 116, No. 11 pp. 2931-2951, 1990.

S. Chen and P. Gu, “Load Carrying Capacity of Composite Beams Prestressed With External Tendons Under Positive Moment”, Journal of Constructional Steel Research Vol. 61, No. 4 pp. 515-530, 2005.

A. M. El-Shihy, H. M. Fawzy, S. A. A. Mustafa and A. A. El-Zohairy, “Experimental and Numerical Analysis of Composite Beams Strengthened by CFRP Laminates in Hogging Moment Region”, Steel and Composite Structures Vol.10, No. 3 pp. 281-295, (2010).

A. A. El-Zohairy, H. Salim, H. F. Shaaban, S. A. A. Mustafa and A. M. El-Shihy, “Finite-Element Modeling of Externally Post-tensioned Composite Beams”, Journal of Bridge Engineering Vol. 20, No. 12 10.1061/(ASCE)BE.1943-5592.0000756, (2015).

ANSYS Element Manual, 10th Edition, release 4. 1, Swanson Analysis Systems Inc., Canonsburg, PA, (2008).

R. P. Johnson and N. Molenstra “Partial shear connection in composite beams for buildings”, Proceedings of the Institution of Civil Engineers Part 2 Vol. 91, No. 4 pp. 679-704, (1991).

A. M. El-Shihy, H. Shehab El-Din, H. F. Shabaan, S. A. A. Mustafa and S. S. J. Moy, “Partial Interaction in Composite Beams Subjected to Torsion in Sagging Moment Region”.


Refbacks

  • There are currently no refbacks.