Techno Press
Techno Press

Steel and Composite Structures   Volume 21, Number 6, August30 2016, pages 1307-1325
Numerical investigation of continuous composite girders strengthened with CFRP
Mohammad A. Samaaneh, Alfarabi M. Sharif, Mohammed H. Baluch and Abul K. Azad

Abstract     [Full Text]
    Nonlinear behavior of two-span, continuous composite steel-concrete girders strengthened with Carbon Fiber Reinforced Polymers (CFRP) bonded to the top of concrete slab over the negative moment region was evaluated using a non-linear Finite Element (FE) model in this paper. A three-dimensional FE model of continuous composite girder using commercial software ABAQUS simulated and validated with experimental results. The interfacial regions of the composite girder components were modeled using suitable interface elements. Validation of the proposed numerical model with experimental data confirmed the applicability of this model to predict the loading history, strain level for the different components and concrete-steel relative slip. The FE model captured the different modes of failure for the continuous composite girder either in the concrete slab or at the interfacial region between CFRP sheet and concrete slab. Through a parametric study, the thickness of CFRP sheet and shear connection required to develop full capacity of the continuous composite girder at negative moment zone have been investigated. The FE results showed that the proper thickness of CFRP sheet at negative moment region is a function of the adhesive strength and the positive moment capacity of the composite section. The shear connection required at the negative moment zone depends on CFRP sheet\'s tensile stress level at ultimate load.
Key Words
    continuous span; steel-concrete composite girder; CFRP; Finite Element (FE); contact model
(1) Mohammad A. Samaaneh:
An-Najah National University, Nablus, Palestine;
(2) Alfarabi M. Sharif, Mohammed H. Baluch, Abul K. Azad:
Department of Civil & Environmental Engineering, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia.

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