摘要 :
In order to further improve the stress state of reinforced concrete deep corbel under local loads, study on the influence of prestressing on the horizontal bearing capacity. Through the calculation and analysis on the horizontal u...
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In order to further improve the stress state of reinforced concrete deep corbel under local loads, study on the influence of prestressing on the horizontal bearing capacity. Through the calculation and analysis on the horizontal ultimate bearing capacity of deep corbel under certain local loads, and then reinforce the deep corbel by the form of external prestressing. According to the calculation results, compared with the normal working state, the crack resistance of deep corbel in prestressed steel strand under the constraint have greatly improved and horizontal ultimate bearing capacity increase obviously. With the increasing of the local loads, the horizontal ultimate bearing capacity of deep corbel is decreasing.
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摘要 :
By using the finite element software ABAQUS to establish the model of industrial workshop corbel, to explore the stress state under local load, and then increase the capacity of corbel by the form of prestressing in corbels' end. ...
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By using the finite element software ABAQUS to establish the model of industrial workshop corbel, to explore the stress state under local load, and then increase the capacity of corbel by the form of prestressing in corbels' end. According to the stress distribution of the calculation, analysis of corbel's normal working state and the prestressed force constraint condition in different forms comparatively. The results found that prestressing at the end of the corbel can significantly improve the ultimate bearing capacity and crack resistance of middle area. Due to the strong constraints of the prestressing, the steel strands can effectively control the deformation of the corbel in horizontal direction, the corbel crack area from the original central transfer to the upper column bending modulus is smaller, eventually destroyed.
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摘要 :
Through the calculation and analysis on the stress state of deep corbel under local compression, reinforce deep corbel by external prestressing form. According to the calculation results, find the difference between the stress dis...
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Through the calculation and analysis on the stress state of deep corbel under local compression, reinforce deep corbel by external prestressing form. According to the calculation results, find the difference between the stress distribution constrained by prestress and that of normal working state, analysis on the influence of different position on the ultimate bearing capacity. The working mechanism of deep corbel and ordinary corbel are basically the same. The concrete at the middle area of corbel constrained by prestress strongly, Its ultimate bearing capacity and crack resistance increased significantly. With the position of prestressed constraints changing, the ultimate bearing capacity of deep corbel also changes. The ideal constrained position is located in the central of deep corbel.
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摘要 :
In this paper, a finite element software ABAQUS is carried out to calculate the ultimate load bearing capacity of the concrete under the restraint of prestressed bar. According to the failure criterion of Mohr-Coulomb, the calcula...
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In this paper, a finite element software ABAQUS is carried out to calculate the ultimate load bearing capacity of the concrete under the restraint of prestressed bar. According to the failure criterion of Mohr-Coulomb, the calculation method of ultimate bearing capacity is put forward, and get the ultimate bearing capacity of concrete constrained by prestress in the beam through calculating. The analysis shows that the stress state of the concrete can be changed by prestress and the ultimate bearing capacity of the beam is improved. By comparing the calculation results, it is concluded that the theoretical formula of the failure criterion of Mohr-Coulomb is similar to the actual results, which can accurately calculate the ultimate bearing capacity of beam end.
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摘要 :
In order to solve the brake safety problem accompanying the rubber wheel drilling machine walking under the coal mine, it is designed that a full hydraulic wet braking system, and its working principle and design scheme of the who...
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In order to solve the brake safety problem accompanying the rubber wheel drilling machine walking under the coal mine, it is designed that a full hydraulic wet braking system, and its working principle and design scheme of the whole system are analyzed. Adopting the idea of redundant design, starting from the hydrostatic closed system and the mechanical wet brake, the system meets the requirements of working conditions. For the problem of unstable parking brake pressure, a detailed calculation is performed, preferably an accumulator group. The test results show that the whole system has high parking torque, stable pressure relief, safe and reliable driving brake performance, rapid response, and braking distance less than 5m, which meets the requirements in coal mine.
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摘要 :
In order to solve the brake safety problem accompanying the rubber wheel drilling machine walking under the coal mine, it is designed that a full hydraulic wet braking system, and its working principle and design scheme of the who...
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In order to solve the brake safety problem accompanying the rubber wheel drilling machine walking under the coal mine, it is designed that a full hydraulic wet braking system, and its working principle and design scheme of the whole system are analyzed. Adopting the idea of redundant design, starting from the hydrostatic closed system and the mechanical wet brake, the system meets the requirements of working conditions. For the problem of unstable parking brake pressure, a detailed calculation is performed, preferably an accumulator group. The test results show that the whole system has high parking torque, stable pressure relief, safe and reliable driving brake performance, rapid response, and braking distance less than 5m, which meets the requirements in coal mine.
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摘要 :
Wall-beam is widely applied to civil engineering structure. By using of the finite element method, the nonlinear finite element analysis is taken on to get the force transfer mechanism of wall-beam, strain distribution of wall-bea...
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Wall-beam is widely applied to civil engineering structure. By using of the finite element method, the nonlinear finite element analysis is taken on to get the force transfer mechanism of wall-beam, strain distribution of wall-beam and prestressed wall-beam is compared. The study on strain distribution of different depth-span ratio is carried on. The conclusion in the paper is the academic support for crack resistance of wall- beam.
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摘要 :
Wall-beam is widely applied to civil engineering structure. By using of the finite element method, the nonlinear finite element analysis is taken on to get the force transfer mechanism of wall-beam, strain distribution of wall-bea...
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Wall-beam is widely applied to civil engineering structure. By using of the finite element method, the nonlinear finite element analysis is taken on to get the force transfer mechanism of wall-beam, strain distribution of wall-beam and prestressed wall-beam is compared. The study on strain distribution of different depth-span ratio is carried on. The conclusion in the paper is the academic support for crack resistance of wall- beam.
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