Abstract
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.
Highlights
With carbon storage and environmentally friendly characteristics, timber has gotten more attention from all walks of life because of its excellent mechanical performance and renewability
According to the test results, the failure modes of the prestressed continuous Glulam beams are divided into three types
Tensile Failure of the Beam Bottom. Failure of this type is manifested in two forms: first, with the increase of the load, the deflection increased gradually, the bottom fiber of the Glulam cracked due to insufficient tensile strength, which eventually led to a decrease in the bearing capacity of the beam, and the loading could not be continued anymore; second, with the increase of the load, the deflection increased gradually, wrinkling appeared on top of the Glulam and extended downward as the load increased continuously, and, the bottom of the Glulam cracked due to tensile force
Summary
With carbon storage and environmentally friendly characteristics, timber has gotten more attention from all walks of life because of its excellent mechanical performance and renewability. E results demonstrated that the ultimate loads and flexural stiffness of reinforced beams could get significant improvement, and the typical failure mode was the timber yield failure in compression zone for reinforced and prestressed Glulam beams. A series of finite element models were developed to predict all influential factors of the Glulam beams and verify some novel reinforcement methods by some researchers [30, 31] These previous studies had investigated the unreinforced and reinforced Glulam beams, all of them were based on supported beams [8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31]. Based on experimental results, a detailed theoretical analysis is given
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