The Experts below are selected from a list of 2640 Experts worldwide ranked by ideXlab platform

Liu Xiao-jie - One of the best experts on this subject based on the ideXlab platform.

  • Mechanics analysis of thin-walled box Continuous Girder with variable cross-sections in considering influence of large deflection and shearlag
    2020
    Co-Authors: Liu Xiao-jie
    Abstract:

    In order to study the mechanics behavior of the thin-walled box Continuous Girder with variable cross-sections considering the influence of large deflection and shear lag,by mean of potential variational theories,considering the influence of the shear lag effect of flange's stress and the geometry nonlinear of vertical displacement,and evolving five generalized displacements with the spline function,the large deflection problem of the thin-walled box Continuous Girder with variable cross-section was transformed to the nonlinear algebra equation group,which was solved with Newton-Raphon iterative method.The calculating results show that different shear lag warp functions to cantilever,top and bottom plate should be taken for analyzing the mechanics behavior of the thin-walled box Continuous Girder reliably.The thin-walled box Continuous Girder with variable cross-section has more reasonable stress state and more adaptable for the longitudinal change of internal forces in the thin-walled box Continuous Girder than that with equal cross-section.The influence of large deflection on the stress and displacement of the thin-walled box Continuous Girder with variable cross-sections depends on the load.

Yuji Chen - One of the best experts on this subject based on the ideXlab platform.

  • Mechanics analysis of thin-walled box Continuous Girder with variable cross-sections in considering effect of large deflection and shear lag
    Frontiers of Structural and Civil Engineering, 2009
    Co-Authors: Yuji Chen
    Abstract:

    In order to study the mechanics behavior of a thin-walled box Continuous Girder with variable cross-sections, using potential variation theories, considering the effect of shear lag of flange’s stress and the nonlinear geometry of vertical displacement, and evolving five generalized displacements with the spline function, the large deflection problem of the thin-walled box Continuous Girder with variable cross-section was transformed to a nonlinear algebraic equation, which was solved using the Newton-Raphon iterative method. The results of the calculation show that different shear lag warp functions to the cantilever, top and bottom plate should be taken to analyze the mechanics behavior of the thin-walled box Continuous Girder reliably. The thin-walled box Continuous Girder with variable cross-sections has more reasonable stress state and is more adaptable for the longitudinal change of internal forces than that with equal cross-sections.The effect of large deflection on the stress and displacement of the thin-walled box Continuous Girder with variable cross-sections depends on the values of the load.

Jiang Wei-zhong - One of the best experts on this subject based on the ideXlab platform.

  • The Analysis and Contrast on the Shear Lag Effect of High-Strength Concrete Thin-Walled Box Continuous Girder
    Natural Science Journal of Xiangtan University, 2020
    Co-Authors: Jiang Wei-zhong
    Abstract:

    Base on the full test on the shear lag effect of the long flanges and trapezoidal section concrete thin-walled box Continuous Girder,considering particular characteristics of the concrete thin-walled box Girder,if suitable element models and material constitutive laws are chose,the ANSYS program may simulate the fully flexural experimental process of the concrete thin-walled box Continuous Girder,the deflection and concrete strain distribution of the flanges in different sections and concentrated loads have been analysed.The analysis result is well agree with the experimental result.

Tianbo Peng - One of the best experts on this subject based on the ideXlab platform.

  • Study of the seismic performance of expansion double spherical seismic isolation bearings for Continuous Girder bridges
    Earthquake Engineering and Engineering Vibration, 2012
    Co-Authors: Tianbo Peng, Xun Tao Yu, Zhen Nan Wang
    Abstract:

    The development of an expansion double spherical seismic isolation (DSSI) bearing by modifying the fixed DSSI bearing is described in this paper. The expansion DSSI bearing is characterized by its good energy dissipation and horizontal displacement capacity and has been successfully integrated into the seismic design of several important engineering projects in China. It is envisioned to be used as a substitute for ordinary expansion bearings in Continuous Girder bridges to distribute the longitudinal earthquake action among all the piers. Its development, configuration and working mechanism are introduced first. The test method and the seismic performance of an expansion DSSI bearing are then briefly described. A theoretical analysis followed by a numerical analysis for an actual four-span Continuous Girder bridge are provided as an example, and it is concluded that the expansion DSSI bearing can be integrated into the seismic design of Continuous Girder bridges.

  • Application of Expansion Double Spherical Seismic Isolation Bearing in Seismic Design of Continuous Girder Bridges
    Advanced Materials Research, 2011
    Co-Authors: Tianbo Peng, Zhen Nan Wang, Xun Tao Yu, Cheng Yu Yang
    Abstract:

    The double spherical seismic isolation (DSSI for short) bearing has been adopted in seismic design of several important engineering projects since developed recently. It was used generally as fixed bearings in a Continuous Girder bridge in these projects, and only a few fixed piers, usually just one fixed pier would transmit the horizontal earthquake action to the foundation, which is uneconomical and results in the much larger seismic risk in the longitudinal direction of a Continuous Girder bridge than that in the transverse direction. In order to share the earthquake effect with all the piers and avoid relative vertical displacement among all the bearings under the normal traffic conditions, a new seismic design method of Continuous Girder bridges is introduced. The configuration and working mechanism of two kinds of DSSI bearings used to make the new seismic design possible are introduced. It’s shown that the method is preferable for the seismic design of Continuous Girder bridges by a numerical seismic analysis with a four-span Continuous Girder bridge.

  • Development of Double Spherical Seismic Isolation Bearing
    2005
    Co-Authors: Tianbo Peng, Jianzhong Li
    Abstract:

    The actual state of China's seismic design of Continuous Girder bridges is discussed and seismic isolation design principle is recommended for this kind of bridge. The configuration and working mechanism of the double spherical seismic isolation bearing developed recently is introduced briefly. The test results of the bearing are introduced in detail and it's shown that this kind of bearing is suitable for the seismic design of Continuous Girder bridges.

Bu Jian-qin - One of the best experts on this subject based on the ideXlab platform.

  • Impacts of Prestress Loss on the Deflection for Large-span Prestressed Concrete Continuous Girder Bridges
    Journal of Railway Engineering Society, 2020
    Co-Authors: Bu Jian-qin
    Abstract:

    Research purposes: In recent years several large-span prestressed concrete Continuous Girder bridges appear large deflection in the main span after opened a period of time at home and abroad,which not only influences the comfort and security of the passing vehicle,but also threatens the safety of the bridge and shortens the service life of the bridge.This study aims to analyze how the prestress loss affect long-term deflection of large-span Continuous Girder bridge,the research conclusions may be the theory basis for taking effective measures to control the Continuous down-warping in the design,construction and reinforcement for large-span prestressed concrete Continuous Girder bridge across.Research conclusions: The deflection of large-span prestressed concrete Continuous Girder bridges is long-term growth,and its growth rate is uncertain. The mid-span deflection increases with the span length,the growth rate has a close relationship with the span length and prestress loss degree,and the prestress loss effect is more obvious when bridge span length is greater. The prestress loss of top deck has more effect on mid-span deflection than that of bottom slab. The creep and shrinkage of concrete and the prestress loss caused by these are the main reason of mid-span deflection large-span prestressed concrete Continuous Girder bridges. This research results can be applied to optimization design and construction for large-span prestressed concrete Continuous Girder bridges.