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

Guo, Nan; Wang, Wenbo; Zuo, Hongliang

doi:10.32604/sdhm.2019.04640

Cited by 7 publications

(8 citation statements)

References 16 publications

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“…However, the design service life of the general structure was 50 years in the building structure. Combined with the previous research experience [34], the existing test data was applied to establish creep model for fitting and estimating the long-term deformation of 50 years in this paper.…”

Section: Establishment Of Creep Modelmentioning

confidence: 99%

Long-Term Loading Test of Reinforced Glulam Beam

Guo¹,

Ren²,

Li³

et al. 2022

Journal of Renewable Materials

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Due to creep characteristics of wood, long-term loading can cause a significant stress loss of steel bars in reinforced glulam beams and high long-term deflection of the beam midspan. In this study, 15 glulam beams were subjected to a 90-day long-term loading test, and the effects of long-term loading value, reinforcement ratio and prestress level on the stress of steel bars, midspan long-term deflection, and other parameters were compared and analyzed. The main conclusions drawn from this study were that the long-term deflection of the reinforced glulam beams accounted for 22.5%, 20.6%, and 18.2% of the total deflection respectively when the loading value was 20%, 30%, and 40% of the estimated ultimate load under the long-term loading. The higher the loading level was, the smaller the proportion of the long-term deflection in the total deflection was. Compared with ordinary glulam beams, the long-term deflection of the reinforced glulam beam was even smaller. Under the condition of the constant loading level, the total stress value of the steel bars decreased by 17.5%, 13.6%, and 9.1%, and the proportion of the long-term deflection of the beam midspan in the total deflection was 26.9%, 24.2%, and 20.6% respectively when the reinforcement ratio was 2.05%, 2.68 %, and 3.39%. With the increase of the reinforcement ratio, the stress loss of the steel bars decreased, and the proportion of the long-term deflection decreased as well. When other conditions remained constant and the prestress level of the steel bars was 0 MPa, 30 MPa, and 60 MPa, the total stress value of the steel bars decreased by 9.1%, 9.4%, and 10.2%, respectively, and the proportion of the long-term deflection in the total deflection was 20.6%, 26.1%, and 64.9%, respectively. With the increase of the prestress value, the stress loss of the steel bars increased, and the proportion of the long-term deflection increased as well.

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Section: Establishment Of Creep Modelmentioning

confidence: 99%

Long-Term Loading Test of Reinforced Glulam Beam

Guo¹,

Ren²,

Li³

et al. 2022

Journal of Renewable Materials

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

Cited by 7 publications

References 16 publications

Long-Term Loading Test of Reinforced Glulam Beam

Long-Term Loading Test of Reinforced Glulam Beam

Bending Performance of Prestressed Continuous Glulam Beams

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

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