Axial compression behaviour of retrofitted long timber columns

Li, Hongmin; Qiu, Hongxing; Zhao, Zhuqing; Lu, Yong

doi:10.1177/1369433217719984

Cited by 5 publications

(6 citation statements)

References 18 publications

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“…The axial compressive performance of the splice columns retrofitted with the steel jacket has been analysed in detail in the earlier experimental study [19,20]. Herein the key design parameters for the splice joint, material properties, and the main experimental conclusions of the retrofitted spliced columns are briefly introduced.…”

Section: Experimental Programmementioning

confidence: 99%

“…In this paper, an analytical model for the axial compression capacity of the splice-retrofitted columns using a steel jacket is developed. This type of splice joint reinforced by a steel jacket has been proposed in recent studies and the axial compressive performance of columns retrofitted with this type of splice has been investigated experimentally [19,20]. The steel jacket is used to enhance the wood joint through confinement and friction between the wood joint and the steel jacket, thus increasing the moment transfer capacity of the joint.…”

Section: Introductionmentioning

confidence: 99%

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An analytical model for the loading capacity of splice-retrofitted slender timber columns

Qiu

2020

Engineering Structures

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Retrofitting timber columns in traditional timber structures with a steel jacketed splice joint has advantages of aesthetic appearance and similar mechanic performance to the intact columns as compared to conventional simple splice columns. The axial compression behavior of such retrofitted splice columns has been studied experimentally in detail. However, there is still a lack of a calculation model for their axial compressive strength and general guideline for their design. The objective of this study is to establish a theoretical calculation model for this type of retrofitted splice columns. Firstly, a theoretical model for the axial compressive strength of splice columns retrofitted with a steel jacket is proposed considering the contact stresses at a splice joint and the relevant stability theory. Secondly, the buckling modes of splice columns and the actual stress distributions at the splice joints (i.e. the compressive stresses at the steel-timber and timbertimber interfaces) are thoroughly investigated. Finally, the theoretical model is validated by the experimental data and finite element analysis results with different splice parameters. Comparisons show that the theoretical calculations in terms of the bearing capacity and stability coefficient agree

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Section: Experimental Programmementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An analytical model for the loading capacity of splice-retrofitted slender timber columns

Qiu

2020

Engineering Structures

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“…Epoxy resin plays a vital role in the repair and reinforcement of timber members in ancient buildings. It effectively bonds split, damaged, or fractured wooden elements as an adhesive [11]. Additionally, epoxy resin fills cracks and decayed voids in ancient timber members as a grouting material [12,13].…”

Section: Introductionmentioning

confidence: 99%

Applicability Evaluation of Modified Epoxy Resin in the Repair and Reinforcement of Ancient Building Timber Members

Han,

Wang,

Huang

et al. 2024

Forests

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To investigate the potential of modified epoxy resin for repairing and strengthening historical wooden structures, this study utilized polyurethane and silicone-modified epoxy resin as the base, alongside a polyamine curing agent. The resin mixture was cured at ambient temperature, resulting in the creation of ten unique epoxy resin systems. Investigation into the chemical structure and alterations to the glass transition temperature were conducted. The study conducted tests and characterization of viscosity, curing rate, mechanical properties, stress failure mode, hygrothermal aging resistance, and bonding properties. The results reveal that the curing degree of the two modified epoxy resins is high after being cured at room temperature, and the chemical structure and curing rate show insignificant changes. The range of the glass transition temperature for the modified epoxy resin is between 61.31 °C and 70.51 °C. The incorporation of polyurethane and silicone molecular chains into the epoxy resin cross-linking curing system enhances the toughness of the epoxy resin. The modified resin achieves a maximum elongation at break that is 5.18 times greater than that of the unmodified resin, along with a maximum tensile strength and a compressive strength that are 7.94 and 1.74 times, respectively, higher than those in the Chinese technical specifications for the maintenance and reinforcement of ancient wooden structures. The increase in toughness changes the failure mode of the cured epoxy resin. The modified epoxy resin exhibits great bonding ability to aged wood, with a shear strength of up to 9.6 MPa along the grain. As a result, the modified epoxy resin meets the requirements for the reinforcement and repair of the timber members of ancient buildings.

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“…Many scholars have studied the load-carrying capacity of timber columns before and after reinforcement (Zahn and Rammer 1995;Najm et al 2007;Song et al 2015;Guo et al 2017). However, the stability capacity is the vital factor for the security of the long timber columns in the ancient timber structures (Li et al 2018) due to the common slenderness ratio of circular timber columns.…”

Section: Introductionmentioning

confidence: 99%

Application of multi-camera digital image correlation in the stability study of the long timber column with the circular cross-section under axial compression

Dai

Qiu³

et al. 2022

BioRes

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Displacement meter synthesis (DMS), as a traditional method, is widely used to capture the local deformation of a specimen. However, for axis-symmetrical circular columns, the axial compression instability cannot be accurately evaluated using the DMS method due to the uncertain bending direction. To address this problem, a 360° full-surface digital image correlation (DIC) system composed of eight cameras is proposed to capture the full-field deformation information of the column surfaces under axial compression. The objective of this study was to experimentally validate the efficiency of the proposed novel measurement in tracking the full-filled compressive deformation of a long wooden column with the circular cross-section. The test results showed that the columns experience instable failure. The multi-camera DIC system can completely reconstruct the three-dimensional shape of the circular column and obtain the whole process deformation state at any position on the surface of the timber column. The DIC method also can capture the uncertain lateral deformation direction and obtain the data of lateral deflection at the mid-span of timber columns. The multi-camera DIC provides an intuitive and comprehensive new test method for the test and analysis of the stability of axisymmetric long timber columns.

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Axial compression behaviour of retrofitted long timber columns

Cited by 5 publications

References 18 publications

An analytical model for the loading capacity of splice-retrofitted slender timber columns

An analytical model for the loading capacity of splice-retrofitted slender timber columns

Applicability Evaluation of Modified Epoxy Resin in the Repair and Reinforcement of Ancient Building Timber Members

Application of multi-camera digital image correlation in the stability study of the long timber column with the circular cross-section under axial compression

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