Abstract
In the water resources allocation project in Pearl River Delta, in order to optimize the structural design, the deep buried tunnel adopts the composite lining structure. However, the weakest link in a complex structure is the connection between two different interfaces. This paper reports the findings of an experimental study that was undertaken to investigate the interface mechanical performance of steel self-compacting concrete composite structure subjected to cyclic loads. In this study, different shear connectors are considered, and six different specimens were designed and tested, respectively. The test is used to research the effect of the different shear connectors on the bearing capacity and interface mechanical properties of composite structure in an experimental study. According to these test results, a detailed analysis was carried out on the relationships, such as the stress-strain and load-displacement relationships for the specimen. These tests show that the shear connectors will significantly enhance the bearing capacity and interface mechanical properties of the composite structure. Among them, the comprehensive performance of the specimens using the stud-longitudinal ribs shear connectors is the best. Additionally, a finite element analysis (FEA) model was developed. The comparison of the simulation results with the experimental results shows that this FEA is applicable for this type of experiment.
Highlights
Introduction is experiment takes the water resources allocation project in Pearl River Delta as the background, in which the deepburied tunnel accounts for 75% of the total length. e deepburied tunnel has the characteristics of large burial depth, long line length, and high internal and external water pressure, and the tunnel construction is in an extreme environment
The high internal and external water pressures often cause the tunnels to be under extreme load conditions [1], and problems in water resources transportation will cause huge economic losses and difficult maintenance
Valente and Cruz [16] conducted a comparative analysis of the performance of stud connectors, T-joints, and perforated plate joints. e test results show that the perforated plate joints have excellent performance in shear resistance and ductility
Summary
Popular among bridge designers due to their good bearing capacity, shear rigidity, and convenient construction [8, 9]. Viest [11] discussed the shear performance of stud connectors through push-out tests and gave the formula for calculating their shear capacities. In order to compare the influence of different composite shear connectors on the bearing capacity of steel-self-compacting concrete composite beams, the interfacial mechanical properties of steelself-compacting concrete composite beams under reciprocating loads were studied in detail. Is paper mainly studies the mechanical properties of the steel-self-compacting concrete interface in the composite lining structure. In order to fully study the mechanical properties of the steel-concrete interface, this study intends to start from the microscopic force mechanism of the interface and conduct the test of the bending and shear properties of the steel self-compacting concrete composite structure and study the behavioral characteristics of the steel-concrete interface under the cyclic loads. In order to fully study the mechanical properties of the steel-concrete interface, this study intends to start from the microscopic force mechanism of the interface and conduct the test of the bending and shear properties of the steel self-compacting concrete composite structure and study the behavioral characteristics of the steel-concrete interface under the cyclic loads. rough the above research, the connection mode of steel-concrete interface is optimized to improve the overall bearing capacity of the structure
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