Compressive Behavior of Longitudinally Cracked Timber Columns Retrofitted Using FRP Sheets

Zhang, Weiping; Song, Xiaoqian; Gu, Xianglin; Tang, Hongyong

doi:10.1061/(asce)st.1943-541x.0000423

Cited by 41 publications

(22 citation statements)

References 8 publications

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“…Note that this retrofitting effect is less formidable than that of wrapping FRP sheets, for which an increase of up to 20% with respect to the intact columns was reported by Zhang et al (2012). This is mainly due to the fact that the FRP confined wood is subjected to a tri-axial stress strain and its mechanical properties can be improved.…”

Section: Maximum Compression Load and Retrofitting Efficiencymentioning

confidence: 73%

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Compressive capacity of longitudinally cracked wood columns retrofitted by self-tapping screws

Song

Jiang

2015

JZUS-A

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This paper presents the results of an experimental and numerical study of the compressive capacity of longitudinally cracked wooden columns retrofitted using self-tapping screws. The screws were driven into the wood perpendicular to the wood grain to alleviate the propagation of existing cracks and to improve the structural integrity of the cracked columns. Full-scale concentric and eccentric compression tests were conducted to investigate the failure modes and maximum load carrying capacity of such columns. A 3D finite element model was developed, verified, and then used for a parametric study. The test results indicated that the cracks (of 6 mm wide) caused a resistance loss of up to 19% compared with an intact column, but most of this resistance loss can be remedied by using self-tapping screws. It was also found that such resistance loss and recovery are dependent on the seriousness of the cracking, and generally increase with the increased initial mid-height deflection and decreased screw spacing, whereas a screw spacing of 100 mm would be sufficient for most cases considered in this study.

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Section: Maximum Compression Load and Retrofitting Efficiencymentioning

confidence: 73%

“…2. The crack width and length were determined following those outlined by Zhang et al (2012) for comparison purposes. The corners of the slots were chamfered with a radius of 3 mm to avoid stress concentration.…”

Section: Column Materials and Specimen Preparationmentioning

confidence: 99%

Compressive capacity of longitudinally cracked wood columns retrofitted by self-tapping screws

Song

Jiang

2015

JZUS-A

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“…Substantial amounts of effort have been devoted to investigating increasing the strength properties of intact timber members after the application of FRP or GFRP bonded externally [7][8][9][10][11]. Zhang et al carried out a series of tests on repairing cracked columns by using FRP wrapping and developed finite element models to simulate the behaviour for parametric studies [12]. The factors considered include (a) the column dimensions, (b) the crack dimensions, (c) whether the crack was filled, (d) FRP properties and (e) FRP spacing.…”

Section: Composite Materials Reinforcementmentioning

confidence: 99%

“…The specimens and different factors considered in the series of tests carried out by Zhang et al[12].…”

mentioning

confidence: 99%

Repair and reinforcement of timber columns and shear walls – A review

Chang

2015

Construction and Building Materials

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h i g h l i g h t sDifferent failure mechanisms of timber columns and shear walls are analysed. Techniques to repair and reinforcement of timber columns and shear walls are introduced and reviewed. Advantages and disadvantages of each technique are analysed, and gaps between research and practice are identified. a b s t r a c tThis paper provides an overview of state-of-the-art repairing and reinforcing techniques on timber columns and shear walls in both research and practice. Both research projects in the laboratory scale and real repair/reinforcement projects are examined. It covers two levels of intervention; repair and reinforcement of timber elements. The former focuses on damaged elements and the latter focuses on enhancing the mechanical properties of the elements. Firstly the need to reinforce and repair timber columns and shear walls is discussed, followed by an extensive review of current techniques for repair and reinforcement. Advantages and disadvantages of different existing techniques are analysed so as to inform future practice and research. Finally, several important issues, such as reversibility and long term behaviour, are also discussed.

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“…From previous researches conducted on timber columns, it was found that the capacity and ductile performance of timber columns were dramatically decreased due to the existence of initial cracks (He et al 2016;Zhang et al 2012). Thus, it is quite prominent to further predict the compressive behavior of glulam columns with initial cracks under eccentric loads.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the ultimate strength of partially infilled and steel-braced reinforced concrete frames

Dubey¹,

Kute²

2013

Int J Adv Struct Eng

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This paper investigates the mechanical performance of longitudinally cracked glulam columns under eccentric compression loads. Experimental investigation was conducted to explore the influence of initial cracks on the failure modes and load bearing capacity of glulam columns. Two different crack patterns named DC and IC, and two column lengths (i.e. 600 and 1100 mm) were considered in the experiments. It was indicated that these two crack patterns reduced the capacity of slender glulam columns and the difference of failure modes was observed between glulam columns with and without initial cracks. Further, a numerical model was developed and validated by the test results. With the application of cohesive zone material model, the propagation of initial cracks could be considered in the numerical modeling. A parametric study was carried out by the verified model and the influence of crack lengths and crack locations was further investigated. From the numerical analysis, it was found that through cracks reduced the capacity of glulam columns significantly. Also, crack location impacts the capacity of glulam columns and the extent of impact relates to the slenderness ratio of the columns, while cracks with different lengths have similar influence on the capacity of columns.

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Compressive Behavior of Longitudinally Cracked Timber Columns Retrofitted Using FRP Sheets

Cited by 41 publications

References 8 publications

Compressive capacity of longitudinally cracked wood columns retrofitted by self-tapping screws

Compressive capacity of longitudinally cracked wood columns retrofitted by self-tapping screws

Repair and reinforcement of timber columns and shear walls – A review

Experimental investigation on the ultimate strength of partially infilled and steel-braced reinforced concrete frames

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