Characterisation of the rotational stiffness and strength of web-flange junctions of pultruded GRP WF-sections via web bending tests

Turvey, G.J.; Zhang, Y.

doi:10.1016/j.compositesa.2005.04.022

Cited by 35 publications

(19 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Approaches considering interaction between flange and web lead to superior agreement and will soon prevail over the simple but old-fashioned approach where web-to-flange junction is assumed as hinged. Another important parameter is the flexibility of the flange-to-web junction, [15]. To date, there is no explicit equation accounting for this flexibility, although significant reduction in critical loads has been reported in literature [16].…”

Section: Introductionmentioning

confidence: 99%

Local Buckling of Pultruded GFRP I-Section Subject to Bending

Vieira¹,

Vieira²,

Cardoso³

2018

Proceedings of the 4th Brazilian Conference on Composite Materials

View full text Add to dashboard Cite

The use of pultruded glass fiber reinforced polymer (pGFRP) has increased significantly in the last few years, especially in aggressive environments. The structural performance of pGFRP members is strongly dependent on their buckling behavior, because of the association of low elastic properties and relatively thin-walled sections adopted. The aim of this study is to present the results of an ongoing experimental work focused on evaluating the local buckling behavior of GFRP I-beams subject to 4-point bending tests. Lateral deflections were measured with displacement transducers and the curvature at compression flange during loading was measured with back-to-back strain gages. A finite element model using actual material properties and bracing conditions was adopted to ensure behavior governed by local buckling and to determine critical bending moment. The influence of web-to-flange rotational stiffness on the behaviour is discussed and, finally, experimental critical loads obtained using Southwell and Koiter techniques are compared to those obtained using analytical expressions recently proposed in literature and to computational analysis 1.

show abstract

Section: Introductionmentioning

confidence: 99%

Local Buckling of Pultruded GFRP I-Section Subject to Bending

Vieira¹,

Vieira²,

Cardoso³

2018

Proceedings of the 4th Brazilian Conference on Composite Materials

View full text Add to dashboard Cite

show abstract

“…In these cases, separation of the two angle legs occurs (refer to Figure 3(b)). This junction inherent deficiency is not limited to open-web pultruded profiles, but also may occur at high stress concentration zones of box sections as shown in Figure 3 Previous research [20][21][22][23][24][25][26][27] showed that the existence of such under-reinforced weak regions greatly influences both strength and stiffness of the global behavior of pultruded structural system including framing connections, durability as well as buckling and post-buckling behavior. Two potential locations where local failure of pultruded WFJs were observed and identified by previous studies 18,19 : (i) at regions of pultruded girders or columns with highest compressive stresses (refer to Premature failure of open-web unidirectional pultruded profiles due to bending loading modes that creates axial tensile stresses at one side of the profile:(a) at high compressive stress concentration (e.g.…”

Section: Introductionmentioning

confidence: 99%

Hygrothermal aging effects on axial behaviour of pultruded web–flange junctions and adhesively bonded build-up bridge members

Xin

Mosallam

Liu

et al. 2017

Journal of Reinforced Plastics and Composites

View full text Add to dashboard Cite

Premature local failure of web/flange junctions of the majority of unstiffened commercially produced pultruded fiberreinforced polymer composites profiles is inescapable due to lack of fiber continuity at the resin-dominated junction zones. This paper focuses on evaluating both short-and long-term behavior of such junctions when subjected to axial tensile stresses. In this study, the axial mechanical behavior of web/flange junctions of pultruded bridge deck components before and after hygrothermal aging effect is investigated. In the experimental phase, axial tensile tests were performed on six different types of pultruded web-flange junctions to assess axial characteristics of each web/flange junction type. In order to evaluate the hygrothermal behavior of such junctions, axial tensile tests were conducted on web/flange junction specimens that were exposed to both fresh water and artificial seawater environments at temperatures of 40 C, 60 C, and 80 C. Several controlling parameters affecting both strength and stiffness of pultruded fiber-reinforced polymer junctions were identified and discussed that include: (i) Junction's web and flange thicknesses, (ii) fillet radius, and (iii) variation of hygrothermal exposure environments. Results of this study indicated that the axial tensile capacity of a pultruded profiles is increased as the thickness of both web and flange increases. Also, it was found that the larger fillet radius of the pultruded fiber-reinforced polymer profile may contribute to a larger axial tensile capacity of pultruded profiles. However, due to variable size and geometry of the resin-rich junction zones and the common manufacturing defects in the form of folded fabric and other fibers misalignment effects, it is difficult to generalize the preceding results. Experimental results also showed that the degradation of web/flange junctions axial tensile strength increases when junctions are exposed to higher temperatures. Also, it was found that the axial tensile characteristics for junctions specimens exposed to freshwater environment are slightly different than those that were exposed to artificial seawater environments.

show abstract

“…In particular, Turvey and Zhang (2006a) suggest to determine the web-flange junction strengths in tension, shear and bending through test methods developed by the same authors (see for example Turvey and Zhang, 2006b). They also proposed a failure criterion taking explicitly account of the multi-directional stress state arising in the web-flange junctions of postbuckled short columns (Turvey and Zhang, 2006a).…”

Section: Local Propertiesmentioning

confidence: 99%

“…Then, on the basis on these new test methods, pultruders should perform experiments on web-flange junctions and report the relevant strengths in their design manuals, in addition to strengths and stiffnesses of web and flange panels. Turvey and Zhang (2006b) and Mosallam et al (2014) evaluated experimentally the rotational stiffness of web-flange junctions, related to relative rotations between web and flange panels. Although this parameter could in theory have an influence on the local buckling strength of PFRP profiles, only few experiments and numerical simulations (Ascione and Mancusi, 2013) have investigated, up today, the effects of possible relative rotations between web and flanges.…”

Section: Local Propertiesmentioning

confidence: 99%

Updating Italian Design Guide CNR DT-205/2007 in View of Recent Research Findings: Requirements for Pultruded FRP Profiles

Minghini

Tullini²,

Ascione³

2016

American Journal of Engineering and Applied Sciences

View full text Add to dashboard Cite

A discussion on some design rules for pultruded fiber-reinforced plastic (PFRP) profiles reported by guideline CNR DT-205/2007 from National Research Council of Italy is presented in the paper. At eight years after approval of this technical document, several changes and improvements are required following recent research findings and supplemental design rules should be incorporated into a future revision. The general framework for the design of columns and beams is outlined. A new closed-form expression for the local buckling moment for beams in majoraxis bending is presented.

show abstract

Characterisation of the rotational stiffness and strength of web-flange junctions of pultruded GRP WF-sections via web bending tests

Cited by 35 publications

References 13 publications

Local Buckling of Pultruded GFRP I-Section Subject to Bending

Local Buckling of Pultruded GFRP I-Section Subject to Bending

Hygrothermal aging effects on axial behaviour of pultruded web–flange junctions and adhesively bonded build-up bridge members

Updating Italian Design Guide CNR DT-205/2007 in View of Recent Research Findings: Requirements for Pultruded FRP Profiles

Contact Info

Product

Resources

About