Impact analysis of I-Lam sandwich system for over-height collision protection of highway bridges

Qiao, Pizhong; Yang, Mijia; Mosallam, Ayman

doi:10.1016/j.engstruct.2004.03.004

Cited by 39 publications

(19 citation statements)

References 24 publications

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“…The faces and core are connected by an adhesive that provides structural continuity across the panel depth. In 2004, Qiao, Yang, and Mosallam [29] discussed the implementation of functionally-degraded sandwich panels for overheight collision protection of highway bridges that was developed by the Mosallam in 1994 [19]. The I-Lam sandwich panel that is made of a composite sandwich construction with multi-layer aluminum honeycomb core and top and bottom aluminum thin face sheets, and they are developed/designed specifically for impact damage protection of bridge girders (e.g., reinforced concrete girders).…”

Section: Related Workmentioning

confidence: 99%

Structural evaluation of reinforced concrete beams strengthened with innovative bolted/bonded advanced frp composites sandwich panels

Mosallam

Elsanadedy

Almusallam

et al. 2015

Composite Structures

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Section: Related Workmentioning

confidence: 99%

Structural evaluation of reinforced concrete beams strengthened with innovative bolted/bonded advanced frp composites sandwich panels

Mosallam

Elsanadedy

Almusallam

et al. 2015

Composite Structures

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“…The total strain energy absorbed by the structure during the deformation includes not only the elastic component but also the plastic strain energy. On the other hand, the peak crushing force P max is sometimes considered one of the critical design objectives to prevent the occupant's body from severe biomechanical injury (Qiao et al 2004). In the load-displacement curve, the peak crushing force P max is defined as the maximum collapse load during the crushing strike.…”

Section: Objective Functions Of Structural Crashworthinessmentioning

confidence: 99%

Multi-objective optimization of functionally graded thickness tubes under external inversion over circular dies

Mohammadiha

Ghariblu

2016

Int J Mech Mater Eng

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This paper optimizes the crushing response and energy absorption of functionally graded thickness (FGT) inversion tubes using the multi-objective optimization method. The numerical results, which are validated by the experimental tests, confirm that optimizing geometry of FGT inversion tube improves energy absorption capacity with respect to ordinary uniform tube UT with the same weight. Our study shows that the die radius r, coefficient of friction μ d between the die and tube, and thickness distribution function have great influence on the responses of FGT inversion tubes. The specific energy absorption (SEA), peak crushing force P max , and dynamic amplification factor (DAF) are selected as the objectives of crashworthiness optimal design. Finally, the weighted average method, multi design optimization (MDO) technique, constrained single-objective optimization, and geometrical average method were employed to find the optimal configuration of the proposed inversion tube. The results give new design ideas to improve crashworthiness performance of inversion tubes.

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“…This novel system was designed and developed by the author. The use of these newly-developed composite sandwich panels [13] was found to be very successful in upgrading flexural strength of reinforced concrete beams [19], steel bridge members [14]) and was also was utilized as collision protection for RC bridges [24]. The advantages of using these sandwich panels in this application includes: (i) ease and rapid installation, (ii) increase in quality control of the prefabricated materials and panels face sheets shop pretreatment surfaces, (iii) light-weight features, (iv) the presence of stiffened holes allows for drilling metal screws or nails that act as both shear connectors and prior to adhesive curing as a temporary clamps, (v) superior fire properties due to higher glass-transition-temperature (T g ) and the use of phenolic matrix, (vi) superior fire resistance of both face sheets and core materials, and (vi) overall all economic advantages.…”

Section: The H-lam Bolted/bonded Sandwich Composite Strengthening Systemmentioning

confidence: 99%

Structural evaluation and design procedure for wood beams repaired and retrofitted with FRP laminates and honeycomb sandwich panels

Mosallam

2016

Composites Part B: Engineering

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a b s t r a c tAs compared to other structural applications of polymeric composites, limited information is available on structural behavior of wood members strengthened with polymer composites. The focus of this paper is to evaluate the structural performance and practical use of wooden beams repaired and retrofitted with fiber-reinforced-polymeric (FRP) composites. The paper presents a summary results of an experimental study on the behavior of both Douglas Fir and Glulam wood beams repaired and retrofitted with different composite strengthening systems. In addition, the paper presents a simplified design procedure to predict the capacity of timber beams strengthened with FRP composites. Two types of composites; wet layup laminates and sandwich panels, and two lamination schedules; unidirectional and bidirectional, and two lamination geometries; U-laminate and flat laminates were evaluated. For "flexure/shear" wood beams repaired and retrofitted with bidirectional, carbon/epoxy U-shaped wet layup laminates, a total of eight Douglas Fir (Dug Fir) Larch # 1 wood beams were tested to failure. For "flexure-only" wood beams retrofitted with flat unidirectional laminates, both wet layup and precured sandwich honeycomb composites were evaluated. Experimental results indicated that the use of composites as external repair and rehabilitation elements resulted in an appreciable increase of both strength and stiffness. A practical case study is also presented that provides a step-by-step procedure for analyzing and designing a polymeric composite system for repair of partially damaged wood girders by fire.

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Impact analysis of I-Lam sandwich system for over-height collision protection of highway bridges

Cited by 39 publications

References 24 publications

Structural evaluation of reinforced concrete beams strengthened with innovative bolted/bonded advanced frp composites sandwich panels

Structural evaluation of reinforced concrete beams strengthened with innovative bolted/bonded advanced frp composites sandwich panels

Multi-objective optimization of functionally graded thickness tubes under external inversion over circular dies

Structural evaluation and design procedure for wood beams repaired and retrofitted with FRP laminates and honeycomb sandwich panels

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