Experimental Study on Flexural Performance of the Prestressed Glulam Continuous Beam after Long-Term Loading

Guo, Nan; Zhang, Yunan; Mei, Lidan; Zhao, Yixi

doi:10.3390/buildings12070895

Cited by 7 publications

(3 citation statements)

References 20 publications

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“…However, the prestress technology used in this paper is unbonded prestress, and the arrangement of prestressed tendons is curved. Referring to the setting method in references [ 36 ], this paper uses the coupling method of the local coordinate system to simulate the unbonded state of a curved prestressed tendon. First, the other nodes except the outermost grid nodes on the prestressed tendons are disconnected to make them free, and then each node is set as the origin in turn, and the X axis points to the next node, thus establishing the local coordinate system of the node.…”

Section: Finite Element Analysis Methodsmentioning

confidence: 99%

Study on Load Transfer Mechanism of Local Curved Prestressed Hollow-Core Slab Bridge

2023

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The assembled hollow-core slab bridge is the most widely used beam bridge in China. With the increasing traffic volume and traffic load in China, the joints of the hollow-core slab bridge are prone to damage. In this paper, a hollow-core slab bridge with locally curved prestressed tendons is proposed. Based on the static load test of a beam with joints taken from the cross section of a hollow-core slab bridge in practical engineering, a finite element nonlinear analysis is used to simulate the test, and the concrete and interface parameters under the correct analysis results are obtained. Finally, the parameters are applied to the three-beam and two-joint hollow-core slab bridge with a span of 10 m and a finite element analysis is carried out to explore the total failure process and performance improvement effect of the prestressed hollow-core slab bridge. The results show that the interface unit method can successfully simulate the new-to-old concrete interface where the joint is in contact with the precast beam segment. Compared with the static load test results, the analysis error of each finite element model is basically within 15%. Compared with the traditional hollow-core slab bridge, the cracking load, through-joint load, and ultimate load of the prestressed hollow-core slab bridge are increased by 50.0%, 91.7%, and 66.7%, respectively. Under the same load, the stress of the U-bar, the relative deflection of both sides of the joint, and the maximum width of the joint of the prestressed hollow-core slab bridge are lower than those of the traditional hollow-core slab bridge. When the ultimate load is reached, the longitudinal crack lengths of the traditional hollow-core slab bridge and the prestressed hollow-core slab bridge are 0.48 L and 0.4 L, respectively, and the damage degree of the prestressed hollow-core slab bridge is lower than that of the traditional hollow-core slab bridge.

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Section: Finite Element Analysis Methodsmentioning

confidence: 99%

Study on Load Transfer Mechanism of Local Curved Prestressed Hollow-Core Slab Bridge

2023

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“…Polynomial fitting is performed on the curve of mid-span deflection against load amplitude, and the slope b N of the curve after Nth load cycles can be estimated. The relationship between the stiffness B N and b N is shown in formula (3). The test results are summarized in Table 4, where the number of the load cycles is in the tens of thousands.…”

Section: Bending Stiffness Degradationmentioning

confidence: 99%

“…At present, many researchers have conducted experimental studies to investigate the engineering behaviors of glulam [2][3][4][5][6][7]. However, most of them considered that the glulam serves under static loads.…”

Section: Introductionmentioning

confidence: 99%

Flexural Fatigue Behavior of Glulam Beams Connected with Steel Splints and Bolts

et al. 2023

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Glulam beams connected with steel splints and bolts (GBSBs) are subjected to cyclic reciprocating dynamic loads in practice, which eventually leads to damage accumulation and structure failure. In order to promote the development of GBSBs, an experimental study was carried out, and theoretical analysis of the fatigue behavior of GBSBs was conducted. Three static load test beams and six fatigue test beams were designed and fabricated, taking into account the different stress levels and fatigue limit loads. Theoretical analysis of the data, linear regression analysis, and electron microscopy analysis of the material were carried out. The test results show that the GBSBs have good fatigue properties and that fatigue damage mainly occurs near the loading point. As the number of load cycles increases, the mid-span deflection and strain of the beam increase by a significant amount, and linear degradation of the stiffness occurs. In addition, a linear regression analysis of the amplitude of the fatigue load and the fatigue life was carried out, resulting in a fatigue limit load of 0.5435 Fu.

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Experimental investigation on flexural performance of polyester polyurethane concrete steel bridge deck composite structure

Niu

Wang

Wang³

et al. 2023

Case Studies in Construction Materials

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Experimental Study on Flexural Performance of the Prestressed Glulam Continuous Beam after Long-Term Loading

Cited by 7 publications

References 20 publications

Study on Load Transfer Mechanism of Local Curved Prestressed Hollow-Core Slab Bridge

Study on Load Transfer Mechanism of Local Curved Prestressed Hollow-Core Slab Bridge

Flexural Fatigue Behavior of Glulam Beams Connected with Steel Splints and Bolts

Experimental investigation on flexural performance of polyester polyurethane concrete steel bridge deck composite structure

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