Bending Performance of Prestressed Continuous Glulam Beams

Guo, Nan; Wu, Mingtao; Li, Ling; Li, Guodong; Zhao, Yixi

doi:10.1155/2021/5512350

Cited by 7 publications

(4 citation statements)

References 24 publications

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“…6. Based on the previous study [30,31], the elastic modulus of the prestressed wire is 2.0 × 10 11 N/m 2 , and the yield stress is 1.1 × 10 9 N/m 2 . And as without consideration of the axial deformation of the wire, but the shear deformation has been considered, the wire is set as a beam type, and its diameter is 0.0035 m. As for other parts, such as steel boot, steel plate, and turning block, their deformation has little effect on the mechanical properties of the beam, so they were set as rigid parts, which are completed by a much higher elastic module.…”

Section: Materials Propertymentioning

confidence: 98%

Investigation of the Effect of the Force Arm on the Bending Capability of Prestressed Glulam Beam

Zhao,

Wu,

et al. 2024

SDHM

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Prestress enables the Glulam beam could make full use of the compression strength, and then increase the span, but it still could not reduce all drawbacks, such as cross-section weakening and small force arm. To avoid slotting and ensure suitable tension and compression couple, one kind of novel anchor has been proposed, which could meet the bearing capacity requirement. And then the bending test of prestressed Glulam beams with a geometric scale ratio of 1: 2 was simulated, to investigate the effect of the force arm on bending capacities, failure modes, and deformation performance. Results show that increasing the force arm could improve the ultimate bending performance of the beam significantly, and the anchor arm length has a certain effect on the performance, but it is not obvious. Finally, based on Finite element method analysis, the practice design suggestions have been offered.

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Section: Materials Propertymentioning

confidence: 98%

Investigation of the Effect of the Force Arm on the Bending Capability of Prestressed Glulam Beam

Zhao,

Wu,

et al. 2024

SDHM

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“…According to the Chinese standard GB50009-2012 [29] for the derivation process of the design value of the bearing capacity of the flexural member and the relevant content of the load effect combination. In terms of ultimate bearing capacity, the average value of the ultimate bearing capacity of the beams (µ R ) was obtained based on the short-term bending experiment data of prestressed glulam continuous beams conducted by the research group in the early stage [12]. The standard value of the ultimate bearing capacity (R k ) under certain reliability was obtained through the probability distribution, and then the design value (R) was obtained through the resistance partial coefficient.…”

Section: Determine Long-term Loads and Timesmentioning

confidence: 99%

“…The advantage was that not only was the stiffness of the joint improved through the connection device and prestress and the semi-rigid connection realized, but also the bending moment distribution was changed, to make further full use of the materials and reduce deformation. The research group carried out related research and tested the short-term flexural performance of continuous beams in the early stage [10][11][12]. The creep characteristic of timber is the key factor affecting the long-term mechanical performance of glulam continuous beams, and because of the application of prestressing, the force of the beam is more complicated.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Long-Term Mechanical Properties of Prestressed Glulam Continuous Beams

et al. 2022

Self Cite

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To study the effect of wood creep on the long-term performance of prestressed glulam continuous beams, a 180-day test was carried out on beams configured with different numbers of steel wires (2, 4, 6) and with different prestress values (0, 7, 14 kN). By investigating the stress loss of the steel wires in the beam and the change in the mid-span deflection over time, the factors influencing the creep of the continuous beam were analyzed. Three models were selected to fit the creep process of the test beams. Moreover, the creep deformation coefficient θ was introduced to reflect the influence of glulam creep on the deflection change in the test beams and to predict the total deflection of the beam within 50 years. The results showed that with increasing the number of steel wires and the prestress value on the beams, the total stress of the steel wires declined more and faster. Increasing the number of steel wires or decreasing the prestress force value could effectively restrain the change speed of the mid-span long-term deflection of the beam. Three models were compared, and the power-law equation was the most accurate. At familiar steel wire quantities and force levels, the θ value of the test beams within the design service life of 50 years was determined to be 1.28–2.29.

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“…In China, Pinus sylvestris, spruce, larch, and Douglas fir are common wood species on the engineering market that produce highly graded and relatively high-quality lumber. Many studies have explored their use as sawn or engineered timber (CLT, OSB, LVL) in the main areas of building structures [3][4][5][6]. Fastgrowing woods (such as radial pine, fir, and poplar) offer a potential application prospect in other raw woods.…”

Section: Introductionmentioning

confidence: 99%

Bending Properties of Cold-Formed Thin-Walled Steel/Fast-Growing Timber Composite I-Beams

Chen,

Liu

et al. 2024

Forests

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A cold-formed, thin-walled steel/fast-growing timber composite system has recently been presented for low-rise buildings. It aims to increase the use of fast-growing wood as a green building material in structures, thus contributing to the transformation of traditional buildings. This study proposed a composite I-beam combined with fast-growing radiata pine and cold-formed thin-walled U-shaped steel. A four-point bending test was used to measure the bending properties of steel–timber composite I-beams under various connection methods. Based on experimental results, this study examined the specimen’s failure mechanism, mechanical properties, and strain development. In addition, a method for calculating flexural bearing capacity based on the superposition principle and transformed section method was suggested. It is evident from the results that fast-growing timber and cold-formed thin-walled steel can have significant composite effects. Different connecting methods significantly impact beams’ failure mode, stiffness, and bearing capacity. Furthermore, the theoretical method for calculating the flexural bearing capacity of composite beams differs from the test value by less than 10%. This paper’s research encourages the applications of fast-growing wood as light residential components, and it serves as a reference for the development, production, and engineering of steel–timber composite structural systems.

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Bending Performance of Prestressed Continuous Glulam Beams

Cited by 7 publications

References 24 publications

Investigation of the Effect of the Force Arm on the Bending Capability of Prestressed Glulam Beam

Investigation of the Effect of the Force Arm on the Bending Capability of Prestressed Glulam Beam

Experimental Study on Long-Term Mechanical Properties of Prestressed Glulam Continuous Beams

Bending Properties of Cold-Formed Thin-Walled Steel/Fast-Growing Timber Composite I-Beams

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