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The proposed formula can preferably fulfill the requirements of security and economy for designing or fabricating the concrete cable ducts. The specimens still have relatively high shear bearing capacity under a small reinforcement ratio of longitudinal reinforcement.
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The effect of stirrup on the shear bearing capacity can be neglected if the stirrup ratio is too small. The experimental results show that the shear bearing capacity increases with the increase of area-stirrup ratio and the longitudinal reinforcement ratio.
#Concrete encased duct bank full size#
The crack growth mode, the distributions of the strain on the cross sections and the load-deflection curves were obtained by the shearing test on several small and full size specimens. An appropriate calculation and design method was proposed based on the different countries' design codes. The shear performance of the concrete cable ducts reinforced with glass fiber reinforced polymer (GFRP) bars was investigated. (C) 2014 American Society of Civil Engineers.
#Concrete encased duct bank software#
In addition to accuracy, the model has two further advantages: it only requires the basic material parameters (i.e., no arbitrary user-defined parameter such as the shear retention factor is required) and it can be directly implemented in the FE software ABAQUS. Numerical results are in close agreement with test data, validating the model. A concrete damage plasticity model is proposed to capture the concrete-to-FRP bond behavior. This paper presents a simple but robust finite-element (FE) model for simulating the bond behavior in the entire debonding process for the single shear test.
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Comparatively, much less research has been concerned with numerical simulation, chiefly due to difficulties in the accurate modeling of the complex behavior of concrete. The FRP-to-concrete bond behavior has been extensively investigated experimentally, commonly using a single or double shear test of the FRP-to-concrete bonded joint. The bond behavior between FRP and concrete thus plays a crucial role in these structures. Debonding of FRP from the concrete substrate is a typical failure mode in such strengthened structures. The technique of externally bonding fiber-reinforced polymer (FRP) composites has become very popular worldwide for retrofitting existing reinforced concrete (RC) structures. It is proposed that the vertical displacement of concrete duct bank can be set as the monitoring item to reveal its safety state, and the minimum curvature radius of longitudinal deformation profile obtained from vertical settlement at different locations can be computed and be taken as the control index. The mechanical properties of underlying soil play a more dominant role in the bearing capacity, mid-span vertical displacement and mid-span deflection of concrete duct bank. Both the test and numerical results indicated that the failure of concrete duct bank presented a distinct brittle pattern. And then numerical simulations were performed for the 1/4 part of real structure and a real-scale concrete duct bank respectively, to investigate the deformation and damage pattern of concrete structure and the wrapped inside conduits. This paper briefly presents an experimental study of concrete duct bank with a 1/4 part of real structure under a monotonic static loading, which was put into a soil box in the laboratory. Due to the shallow burial depth, the concrete duct bank for underground cables frequently encountered differential settlement, tilt and other damage like cracking when construction activity was carried out in the vicinity.
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