Analysis and design of pultruded FRP shapes under bending

Davalos, Julio F.; Salim, Hani; Qiao, Pizhong; Lopez-Anido, Roberto; Barbero, Ever J.

doi:10.1016/1359-8368(95)00015-1

Cited by 117 publications

(49 citation statements)

References 8 publications

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“…Modeling of face laminates. The engineering properties of laminated panels can be predicted by a combined micro/macromechanics approach [Davalos et al 1996]. The prediction of the ply properties using the micromechanics approach is well defined [Chamis 1984].…”

Section: Effective Flexural and Shear Stiffness Of Sandwich Decksmentioning

confidence: 99%

“…A set of equivalent laminate stiffness properties can be defined for approximately balanced symmetric face laminates [Davalos et al 1996] and are given in Table 2. These elastic constants (e.g., E f x , E f y , G f x y , and ν f x y ) represent the stiffness of an equivalent orthotropic plate that behaves like the actual laminate under out-of-plane and in-plane loads.…”

Section: ±45 • ) (4) Unidirectional Layer Of Fiber Bundles or Rovingsmentioning

confidence: 99%

“…In addition, it compares their dynamic loading factors to those of conventional concrete decks. First, the analytical stiffness properties of the face sheets and the core of the sandwich structures are estimated using the micro/macromechanics method [Davalos et al 1996]. The stiffness properties of whole sandwich panel are then evaluated by modeling the sandwich panel as a three-layer laminated structure, and the estimated stiffness properties are subsequently used for predicting the dynamic responses of FRP sandwich bridge decks.…”

Section: Introductionmentioning

confidence: 99%

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2010

J. Mech. Mater. Struct.

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This study presents the development of a constitutive model for in-plane mechanical behavior of five styles of plain woven Kevlar fabrics impregnated with silica nanoparticles. The neat fabrics differed in fiber type, yarn count, denier, weave tightness and strength, and varying proportions (4, 8, 16 and 24% by weight) of nanoparticles were added to enhance the mechanical properties of the fabric. It was found that fabrics impregnated with nanoparticles exhibit significant improvement in shear stiffness and a slight increase in tensile stiffness along the yarn directions over their neat counterparts. A constitutive model was developed to characterize the nonlinear anisotropic properties of nanoparticle-impregnated fabrics undergoing large shear deformation. The parameters for the model were determined based on uniaxial (along yarn directions) and 45• off-axis tension tests. This model was incorporated in the commercial FEA software ABAQUS through a user-defined material subroutine to simulate various load cases.

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Section: Effective Flexural and Shear Stiffness Of Sandwich Decksmentioning

confidence: 99%

Section: ±45 • ) (4) Unidirectional Layer Of Fiber Bundles or Rovingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Untitled

2010

J. Mech. Mater. Struct.

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“…A set of equivalent laminate stiffness properties can be defined for approximately balanced symmetric face laminates [Davalos et al 1996] and are given in Figure 2. A unit cell of sinusoidal core.…”

Section: Effective Flexural and Shear Stiffness Of Sandwich Decksmentioning

confidence: 99%

A coupled honeycomb composite sandwich bridge-vehicle interaction model

Yang

Papagiannakis

2010

J. Mech. Mater. Struct.

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This paper presents a coupled, dynamic vehicle and honeycomb composite sandwich bridge deck interaction model. The composite sandwich deck consists of E-glass fibers and polyester resin. Its core consists of corrugated cells in a sinusoidal configuration along the travel direction. First, analytical predictions of the effective flexural and transverse shear stiffness properties of the sandwich deck were obtained in the longitudinal and transverse directions. These were based on the modeling of equivalent properties for the face laminates and core elements. Using the first order shear sandwich theory, the dynamic response of the sandwich deck was analyzed under moving dynamic loads. A dynamic vehicle simulation model was used for the latter, assuming that the deck response is the only source of excitation (i.e., its roughness was assumed to be negligible). Subsequently, the dynamic load factors of the sandwich bridge deck were calculated for different traveling velocities. The results suggest that the dynamic load factors vary with the traveling speed and increase significantly with decreasing deck stiffness. Considering multiple degrees of freedom for the vehicle further amplifies the dynamic loading factor and increases the vibration generated by vehicles.

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“…For example Davalos et al [13] presented an approach for flexural analysis and design of pultruded beams. This approach involved computational procedures for utilizing fiber volume fraction of the constituents, ply stiffness and panel laminate engineering constants.…”

Section: Introductionmentioning

confidence: 99%

Structural evaluation of axial and rotational flexibility and strength of web–flange junctions of open-web pultruded composites

Mosallam

Feo

Elsadek

et al. 2014

Composites Part B: Engineering

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In past few decades, the interest in using pultruded fiber reinforced polymeric (PFRP) composites in construction\ud applications has grown rapidly. Several research studies were conducted and focused on the\ud performance of PFRP beams, columns and frame structures. The results of the majority of previous studies\ud highlighted a major problem associated with the deficiency of the off-the-shelf, unidirectional open-web\ud pultruded profiles. In this regards, a common conclusion was drawn by many researchers; that is: the\ud inherent structural deficiency of commercially produced unidirectional PFRP profiles, especially at the\ud flange/web(s) junction(s) that lacks fiber continuity. The lack of fiber continuity creates a ‘‘resin-rich’’\ud zones at the junctions that were shown to be responsible for rapid degradation of both axial and rotational\ud stiffness as well as the strength of the majority of PFRP profiles. Another related problem is the\ud use of incorrect framing connection details, currently being used by industry.\ud Such connection details mimic those associated with steel structures. This approach ignores both the\ud anisotropic and the viscoelastic nature of composites as well as the aforementioned inherent junction\ud deficiency that, in most cases, lead to a greater risk with regard to the safety, reliability and economic\ud aspects of such structures. This paper presents a summary of an experimental study aimed at evaluating\ud both axial and rotational stiffnesses and strengths of web–flange junctions, which may affect stiffness,\ud buckling, post-buckling, torsional and overall strength of PFRP structures. In particular, three sizes of\ud commercially-produced unidirectional pultruded H-profiles and two sizes of L-profiles were evaluated\ud under both service and ultimate loads. Using full-scale experimental data, P–d and M–h relations and idealized\ud expressions for each pultruded profile were developed that can be used for accurate modeling and\ud for establishing design limit-states for PFRP structures. In addition, two special test fixtures were\ud designed, fabricated and validated that can be adopted by ASTM/ISO standards for characterizing such\ud critical mechanical properties that are essential for reliable design of pultruded composite structures.\ud Conclusions and design recommendations are also presented

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Analysis and design of pultruded FRP shapes under bending

Cited by 117 publications

References 8 publications

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A coupled honeycomb composite sandwich bridge-vehicle interaction model

Structural evaluation of axial and rotational flexibility and strength of web–flange junctions of open-web pultruded composites

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