Study of Short-Term Flexural Behavior for Glue-Bamboo and Lumber Beams Under Different Pre-Stressed States

Guo, Nan; Wang, Yanjun; Zuo, Hongliang

doi:10.14311/cej.2017.02.0012

Cited by 4 publications

(6 citation statements)

References 4 publications

(4 reference statements)

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“…Because of no similar research on other forms of prestressed continuous beams, there is no direct comparison. Nevertheless, based on former research [28,29,35], compared with Glulam beams, the bearing capacity of the continuous prestressed beams can be increased by 106.4% to 652.4%, and the bearing capacity of other types of prestressed Glulam beams was increased by 28.5% to 28.8% [21,26]. erefore, compared with other types of prestressed beams, the prestressed continuous beam proposed is more effective and feasible.…”

Section: Contrastive Analysis Of Continuous Beams and Simply Supported Beamsmentioning

confidence: 99%

“…e results indicated that bending capacity and deformation capacity could be improved significantly. e use of prestress for structural strengthening of timber structures was detailedly assessed, and then prestress was used to strengthen the mechanical properties of the Glulam beams [20][21][22][23][24][25][26][27][28][29]. Wei et al [21] proposed a novel steel-reinforced PBSL beam in which steel bars or prestressed steel bars were embedded in bamboo-composite beams.…”

Section: Introductionmentioning

confidence: 99%

“…ere is not any research on prestressed continuous beams. erefore, based on prestressed simply supported Glulam beams proposed in previous studies [28,29], a set of end-connection devices are invented in this study to form prestressed continuous Glulam beams. As a novel prestressed composite bending bearing member, the prestressed continuous Glulam beams have the advantages of prestressed simply supported Glulam beams and the improved joint stiffness.…”

Section: Introductionmentioning

confidence: 99%

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Bending Performance of Prestressed Continuous Glulam Beams

Guo

et al. 2021

Advances in Civil Engineering

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The limited transferring moment capability of Glulam (glued laminated wood) joints results in insufficient joint stiffness. Therefore, most of the connections are hinged joints. Based on the previous studies, one novel end-connection device was proposed to form prestressed continuous Glulam beams. The prestressed beams were composed of prestressed low-relaxation steel bars, the deviator block, the anchorage device, and the novel end-connection apparatus. These prestressed steel bars were tensioned by the deviator block to exert prestress. Then, 18 prestressed continuous beams and two prestressed simply supported beams were subject to the bending tests to explore the impact of reinforcement ratio and prestress on the prestressed Glulam beams from aspects such as failure modes, bearing capacity, load-deflection relationship, and load-strain relationship. The results show that, given the same prestress level, compared with beams with a reinforcement ratio of 1.92%, the bearing capacity of beams with a reinforcement ratio of 3.84% and 5.76% is increased by 20.3%–29.4% and 30.51%–36.36%, respectively. Given the same reinforcement ratios, compared with beams without prestressing, the bearing capacity of beams with a prestressing force of 7 kN and 14 kN is increased by 2.39%–10.14% and 6.49%–13.26%, respectively. In addition, compared with simply supported beams, the bearing capacity of continuous beams is increased by 40%, and the deformation is reduced by 13%. Therefore, as a novel prestressed beam, the bending performance of Glulam beams can be improved effectively.

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Section: Contrastive Analysis Of Continuous Beams and Simply Supported Beamsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bending Performance of Prestressed Continuous Glulam Beams

Guo

et al. 2021

Advances in Civil Engineering

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“…To take full advantage of material properties and enrich structural forms, the author of this paper based on the previously proposed prestressed glulam simply supported beams, and then exploited the prestressed glulam continuous beam through a new set of connection apparatuses, as shown in Fig. 1a [20,21]. The continuous beam combined two glulam beams through the new connection apparatus.…”

Section: Introductionmentioning

confidence: 99%

Study on flexural performance of prestressed glulam continuous beams under control influence

Mei

Guo

et al. 2021

J Wood Sci

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Traditional glulam beam connection mode has a weak ability to transfer bending moment, leading to insufficient joint stiffness and mostly in the form of simply supported beams. To make full use of material strength, a novel prestressed glulam continuous beam was proposed. On this basis, this paper put forward a new method to further improve the mechanical performance of the beams by controlling prestress. According to the estimated ultimate loads of the beams, six different control range values were formulated, and 12 continuous beams were tested for flexural performance. The effects of prestressing control on the failure modes, ultimate load capacity, and load versus deformation relationships of the glulam continuous beams were analyzed. The test results indicated that the flexural performance of the beams with prestressed control was significantly improved compared to the uncontrolled beams, the ultimate load was enhanced by 13.60%–45.11%, and the average steel wire stress at failure was increased from 70% of the designed tensile strength to 94%. Combined with the finite element analysis (FEA), the reasonable control range of the prestressed control continuous beams was18%–30% of the estimated ultimate load. The research in this paper can provide references for the theoretical analysis and engineering application of similar structures.

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“…At present, scholars at home and abroad have carried out a series of researches on the mechanical properties of glulam beams [Fava, Carvelli and Poggi (2013); Franke, Franke and Harte (2015); Sinha, Way and Mlasko (2014); Issa and Kmeid (2005)] in order to strengthen glulam with new materials [Uzel, Togay, Anil et al (2017); Ribeiro, Abílio, Lima et al (2009); Ferrier, Labossière and Neale (2012); ; Wei, Ji, Duan et al (2017); Anshari, Guan, Kitamori et al (2012); Zhong, Wu, Ren et al (2017); Fang, Sun, Liu et al (2015)]. In order to improve the flexural property of glulam beams, make full use of materials and increase the application scope of glulam beams, scholars at home and abroad put forward the idea of applying pre-stress to ordinary wood beams and glulam beams, and made a series of explorations, mainly including two aspects: application of pre-stress through stretching the pre-stressed tendon and tensioning fibre materials [Guo, Wang and Zuo (2017); Luca and Marano (2012); D'Aveni and D'Agata (2017); McConnell, McPolin and Taylor (2014); Yang, Ju, Liu et al (2016); Guan, Rodd and Pope (2005); Negrão (2016)] . At present, scholars at home and abroad haven't carried out the research on the flexural property of string beams of pre-stressed glulam based on the influence of regulation and control, so this study is of great significance.…”

Section: Introductionmentioning

confidence: 99%

Flexural Property of String Beam of Pre-Stressed Glulam Based on Influence of Regulation and Control

Guo¹,

Wang²,

Zuo³

2019

Structural Durability &Amp; Health Monitoring

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Applying pre-stress in glulam beam can reduce its deformation and make full use of the compressive strength of wood. However, when the glulam with low strength and the pre-stressed steel with high strength form combined members, materials of high strength can't be fully utilized. Therefore, this study puts forward the idea of regulating and controlling string beam of pre-stressed glulam. By regulating and controlling the pre-stress, a part of the load borne by the wood is allocated to the pre-stressed tendon, which is equivalent to completing a redistribution of internal force, thus realizing the repeated utilization of the wood strength and the full utilization of the strength of the high-strength pre-stressed tendon. The bending experiments of 10 beams under 5 working conditions are carried out. The failure mode, bearing capacity and deformation of the beams are analyzed. The results show that 90% of beams are deformed under compression. The ultimate load of the regulated and controlled beam is obviously larger than that of the unregulated beam, and the ultimate load of the beam increases with the increase of the degree of regulation and control. Compared with that of the unregulated beams, the ultimate load of beams regulated by 7.5%-30% increases by 25.42%-65.08%, and the regulated and controlled effect is obvious. With the increase of the regulation and control amplitude of pre-stress, the stiffness of string beam of pre-stressed glulam increases. In addition, with the increase of the regulation and control amplitude, the compression height of the beam increases before the failure, and it reaches the state of full-section compression at the time of failure, giving full play to the compressive property of the glulam. At the end of the experiment, the constitutive relation which can reflect the anisotropy of the wood is established combined with the experimental data. The finite element analysis of the beam under 7 working conditions is carried out by using ABAQUS finite element program, and the influence of the regulation and control amplitude on the stress distribution and ultimate bearing capacity of the beam is discussed.

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Study of Short-Term Flexural Behavior for Glue-Bamboo and Lumber Beams Under Different Pre-Stressed States

Cited by 4 publications

References 4 publications

Bending Performance of Prestressed Continuous Glulam Beams

Bending Performance of Prestressed Continuous Glulam Beams

Study on flexural performance of prestressed glulam continuous beams under control influence

Flexural Property of String Beam of Pre-Stressed Glulam Based on Influence of Regulation and Control

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