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Bar Diameter

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Paul Anthony Withey – One of the best experts on this subject based on the ideXlab platform.

  • the influence of mould pre heat temperature and casting size on the interaction between a ti 46al 8nb 1b alloy and the mould comprising an al2o3 face coat
    Materials Chemistry and Physics, 2014
    Co-Authors: Xu Cheng, Paul Anthony Withey, C Yuan, D M Shevchenko

    Abstract:

    Abstract Alumina has been used as a mould face coat material for investment casting titanium alloys for many years; the interaction between the Al2O3 and the alloys are exemplified by a hardened layer formed at the alloy interface. In this research, the interaction between the Al2O3 face coat and a Ti–46Al–8Nb–1B alloy was investigated by modelling the cooling profile of the mould during casting. The interaction between the mould and metal was identified from the hardened layer thickness and metal/shell interface microstructural changes. Results showed that a high mould pre-heat temperature and large Bar Diameter will enhance the interaction between the shell and the TiAl alloy. During the casting process, not only was oxygen observed penetrating into the metal through the decomposition of the face coat materials, but also silicon from the backup coat was found to interact with the metal during the casting process.

Zhe Wang – One of the best experts on this subject based on the ideXlab platform.

  • numerical study on seismic behavior of precast bridge columns with large Diameter Bars and uhpc grout considering the Bar slip effect
    Bulletin of Earthquake Engineering, 2020
    Co-Authors: Zhe Wang, Jingqua Wang, Guotang Zhao, Jia Zhang

    Abstract:

    A novel connection adopting lap-spliced large-Diameter Bars and ultra-high performance concrete (UHPC) grout was developed to accelerate the assemble progress of precast bridge columns. The precast bridge column adopting the connections was testified to be on a par with the monolithic concrete counterpart in terms of seismic performance in previous research. This paper aims to develop a numerical model to further investigate the seismic behavior of the proposed bridge column considering the Bar-slip effect. A finite element model was established for the bridge columns considering deformation components of flexure, shear, and Bar-slip. The bond behavior between the deformed Bar and UHPC was defined using a new practical model, which was developed based on a pullout test including five specimens in this research. The established finite element model was verified by the cyclic loading test in literature in terms of the overall hysteretic curve and local responses. The validated model was used to conduct parametric analysis to study the contributions of the different deformation components to lateral deformation as well as the effects of large-Diameter Bars on seismic performance. Results show that all the pullout specimens have the tensile fracture of Bars, which indicates that the development length of 5 times Bar Diameter is sufficient for deformed Bars in UHPC when the Bar Diameter is no more than 32 mm. The practical model is effective to consider the effects of the slip between the deformed Bar and UHPC. The finite element model can predict the overall hysteretic curve and local responses at different drift ratios. The Bar-slip has a considerable even dominative contribution to the lateral deformation of the proposed bridge column. Larger Bar Diameter can enhance deformation capacity as well as reduce energy dissipation and residual drift ratio.

Jia Zhang – One of the best experts on this subject based on the ideXlab platform.

  • numerical study on seismic behavior of precast bridge columns with large Diameter Bars and uhpc grout considering the Bar slip effect
    Bulletin of Earthquake Engineering, 2020
    Co-Authors: Zhe Wang, Jingqua Wang, Guotang Zhao, Jia Zhang

    Abstract:

    A novel connection adopting lap-spliced large-Diameter Bars and ultra-high performance concrete (UHPC) grout was developed to accelerate the assemble progress of precast bridge columns. The precast bridge column adopting the connections was testified to be on a par with the monolithic concrete counterpart in terms of seismic performance in previous research. This paper aims to develop a numerical model to further investigate the seismic behavior of the proposed bridge column considering the Bar-slip effect. A finite element model was established for the bridge columns considering deformation components of flexure, shear, and Bar-slip. The bond behavior between the deformed Bar and UHPC was defined using a new practical model, which was developed based on a pullout test including five specimens in this research. The established finite element model was verified by the cyclic loading test in literature in terms of the overall hysteretic curve and local responses. The validated model was used to conduct parametric analysis to study the contributions of the different deformation components to lateral deformation as well as the effects of large-Diameter Bars on seismic performance. Results show that all the pullout specimens have the tensile fracture of Bars, which indicates that the development length of 5 times Bar Diameter is sufficient for deformed Bars in UHPC when the Bar Diameter is no more than 32 mm. The practical model is effective to consider the effects of the slip between the deformed Bar and UHPC. The finite element model can predict the overall hysteretic curve and local responses at different drift ratios. The Bar-slip has a considerable even dominative contribution to the lateral deformation of the proposed bridge column. Larger Bar Diameter can enhance deformation capacity as well as reduce energy dissipation and residual drift ratio.