Fatigue and Overloading Behavior of Steel–Concrete Composite Flexural Members Strengthened ...

Fatigue and Overloading Behavior of Steel–Concrete Composite Flexural Members Strengthened ...

11 Pages · 2007 · 1.27 MB · English

the fundamental behavior of steel–concrete composite scaled bridge beams strengthened with new high modulus carbon fiber-reinforced polymer (HM CFRP) materials. The behavior of the beams under overloading conditions and fatigue loading conditions was studied as well as the possible presence 

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Fatigue and Overloading Behavior of Steel–Concrete Composite Flexural Members Strengthened with High Modulus CFRP Materials M Dawood 1; S Rizkalla 2; and E Sumner 3 Abstract:Due to corrosion and the continuous demand to increase traf?c loads, there is a need for an effective system which can be used to repair and/or strengthen steel bridges and structures This paper describes an experimental program, recently completed, to investigate the fundamental behavior of steel?concrete composite scaled bridge beams strengthened with new high modulus carbon ?berreinforced polymerHM CFRPmaterials The behavior of the beams under overloading conditions and fatigue loading conditions was studied as well as the possible presence of shear lag at the interface of the steel surface and the CFRP strengthening material The test results are compared to an analytical model based on the fundamental principles of equilibrium and compatibility, to predict the behavior of the strengthened steel?concrete composite beams Based on the ?ndings of this research work, combined with other work in the literature, a design guideline is proposed for the use of HM CFRP for strengthening the steel ?exural members typically used for bridges and structures DOI:101061/ASCE10900268200711:6659 CE Database subject headings:Fatigue; Composite materials; Fiber reinforced polymers; Flexure; Beams; Bridges Introduction The use of ?berreinforced polymerFRPmaterials has become a common practice for the repair and strengthening of concrete structures and bridges Due to the success of this technique, sev eral researchers have also investigated the use of externally bonded carbon FRPCFRPmaterials for the repair and strength ening of steel bridges and structures A number of different ap proaches have been investigated to assess the effectiveness of using CFRP materials for rehabilitation of steel bridge girders including repair of naturally deteriorated girdersMertz and Gillespie 1996, repair of overloaded girdersSen et al 2001, strengthening of undamaged girdersTavakkolizadeh and Saadat manesh 2003c, and repair of girders with simulated corrosion damageAlSaidy et al 2004 Other research has been conducted to study the fatigue durability of CFRP strengthening systems Miller et al 2001 Early research focused on the use of conventional modulus CFRP materials to repair naturally corroded bridge girdersMertzand Gillespie 1996 The research ?ndings indicated that CFRP materials can be effectively used to restore the stiffness and ?ex ural capacity of the damaged girders to levels comparable to those of the undamaged girders Researchers have also investigated the use of conventional CFRP materials to repair steel?concrete composite bridge girders which were damaged due to severe overloading conditionsSen et al 2001 The CFRP strengthening system helped to increase the nominal capacity of the beams by up to 52% The presence of the CFRP also substantially increased the yield load and postelas tic stiffness of the strengthened beams In another study, three undamaged steel?concrete composite beams were strengthened with one, three, and ?ve layers of CFRP strips, respectivelyTavakkolizadeh and Saadatmanesh 2003c The CFRP materials increased the nominal capacity of the strengthened beams by up to 76%, however, the increase of the elastic stiffness was minimal In a related study, the tension ?ange of three other steel?concrete composite beams were notched with a 13 mm wide notch at midspan to simulate 25, 50, and 100% loss of the area of the tension ?angeTavakkolizadeh and Saadat manesh 2003b The repair restored the elastic stiffness and nomi nal capacity of the girders to levels comparable to the undamaged beams and helped in reducing the residual de?ections due to over loading conditions Other researchers have simulated corrosion damage by remov ing a uniform portion of the tension ?ange along the entire length of the girdersAlSaidy et al 2004 CFRP materials were sub sequently used to repair the girders The technique restored the lost strength of the damaged beams to levels higher than those of the undamaged girders However, only 50% of the lost stiffness of the beams was recovered Investigations on the fatigue durability of steel beams strengthened with CFRP materials have been limited Tavakkolizadeh and Saadatmanesh2003ademonstrated that installation of externally bonded CFRP patches can reduce crack 1Graduate Research Assistant, Constructed Facilities Laboratory, North Carolina State Univ, 2414 Campus Shore Dr, Campus Box 7533, Raleigh,

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