The Experts below are selected from a list of 255 Experts worldwide ranked by ideXlab platform

Jianmin Yuan - One of the best experts on this subject based on the ideXlab platform.

  • many body chiral edge currents and sliding phases of atomic spin waves in momentum Space Lattice
    Physical Review Letters, 2020
    Co-Authors: Han Cai, Dawei Wang, Jianmin Yuan
    Abstract:

    Collective excitations (spin waves) of long-lived atomic hyperfine states can be synthesized into a Bose-Hubbard model in momentum Space. We explore many-body ground states and dynamics of a two-leg momentum-Space Lattice formed by two coupled hyperfine states. Essential ingredients of this setting are a staggered artificial magnetic field engineered by lasers that couple the spin wave states and a state-dependent long-range interaction, which is induced by laser dressing a hyperfine state to a Rydberg state. The Rydberg dressed two-body interaction gives rise to a state-dependent blockade in momentum Space and can amplify staggered flux-induced antichiral edge currents in the many-body ground state in the presence of magnetic flux. When the Rydberg dressing is applied to both hyperfine states, exotic sliding insulating and superfluid (supersolid) phases emerge. Because of the Rydberg dressed long-range interaction, spin waves slide along a leg of the momentum-Space Lattice without costing energy. Our study paves a route to the quantum simulation of topological phases and exotic dynamics with interacting spin waves of atomic hyperfine states in momentum-Space Lattice.

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

  • Behavior of eccentrically loaded welded hollow spherical joints after elevated-temperature exposure:
    Advances in Structural Engineering, 2018
    Co-Authors: Zhihua Chen, Hongbo Liu, Zimei Guo
    Abstract:

    Welded hollow spherical joint is an extremely widely used connection pattern in Space Lattice structures. Understanding the behavior of the welded hollow spherical joint after elevated-temperature ...

  • Post-fire Behavior of Welded Hollow Spherical Joints Subjected to Eccentric Loads
    International Journal of Steel Structures, 2018
    Co-Authors: Hongbo Liu, Zhihua Chen
    Abstract:

    Welded hollow spherical joints are widely used as a connection pattern in Space Lattice structures. Understanding the post-fire residual behavior of welded hollow spherical joints is crucial for fire damage assessment of the Space Lattice structures. However, the post-fire behavior of welded hollow spherical joints has not been explored in existing studies. In this paper, experimental and numerical studies were conducted to investigate the residual behavior of eccentrically loaded welded hollow spherical joints after fire exposure. Eccentric compressive tests were performed on five joint specimens after exposure to the ISO-834 standard fire (including both heating and cooling phases), and three highest fire temperatures, i.e., 600, 800, and 1000 °C, were considered. The temperature distributions in the specimens during the heating and cooling process and the related mechanical behavior of the specimens, such as load versus longitudinal displacement and rotation responses, load-bearing capacities, and strain distributions, were obtained and analyzed. Finite element analysis (FEA), including both heat transfer and mechanical analysis, were also developed using the ABAQUS software. Having validated the FE models against the experimental results, a design method was proposed on the basis of parametric studies to predict the residual load-bearing capacity of eccentrically loaded welded hollow spherical joints after fire exposure.

  • behavior of welded hollow spherical joints after exposure to iso 834 standard fire
    Journal of Constructional Steel Research, 2018
    Co-Authors: Hongbo Liu, Zhihua Chen
    Abstract:

    Abstract Welded hollow spherical joints are extensively used as a connection pattern in Space Lattice structures. Provided that structural collapse does not occur after a fire, a reliable evaluation of the residual performances of the structures is necessary to decide whether the structures should be dismantled, repaired, or directly reused. Thus, understanding the post-fire residual behavior of welded hollow spherical joints, which act as key connection elements, is crucial for fire damage assessment of the Space Lattice structures. In this paper, experimental and numerical studies were conducted to reveal the residual structural behavior of welded hollow spherical joints after fire exposure. Axial compressive tests were performed on eight joint specimens after exposure to the ISO-834 standard fire (including both heating and cooling phases), and three highest fire temperatures, i.e., 600 °C, 800 °C, and 1000 °C, were considered. The temperature distributions in the specimens during the heating and cooling process and the related mechanical behavior of the specimens, such as axial load–displacement curves, initial axial stiffness, yield loads, load-bearing capacities, ductility level, and strain distributions, were obtained and analyzed. Finite element analysis (FEA), including both heat transfer and stress analysis, were also developed using the ABAQUS software. Having validated the FE models against the experimental results, a design method was proposed on the basis of parametric studies to predict both the residual load-bearing capacity and initial axial stiffness of welded hollow spherical joints after fire exposure.

Fred Torcaso - One of the best experts on this subject based on the ideXlab platform.

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

  • Behavior of eccentrically loaded welded hollow spherical joints after elevated-temperature exposure:
    Advances in Structural Engineering, 2018
    Co-Authors: Zhihua Chen, Hongbo Liu, Zimei Guo
    Abstract:

    Welded hollow spherical joint is an extremely widely used connection pattern in Space Lattice structures. Understanding the behavior of the welded hollow spherical joint after elevated-temperature ...

  • Post-fire Behavior of Welded Hollow Spherical Joints Subjected to Eccentric Loads
    International Journal of Steel Structures, 2018
    Co-Authors: Hongbo Liu, Zhihua Chen
    Abstract:

    Welded hollow spherical joints are widely used as a connection pattern in Space Lattice structures. Understanding the post-fire residual behavior of welded hollow spherical joints is crucial for fire damage assessment of the Space Lattice structures. However, the post-fire behavior of welded hollow spherical joints has not been explored in existing studies. In this paper, experimental and numerical studies were conducted to investigate the residual behavior of eccentrically loaded welded hollow spherical joints after fire exposure. Eccentric compressive tests were performed on five joint specimens after exposure to the ISO-834 standard fire (including both heating and cooling phases), and three highest fire temperatures, i.e., 600, 800, and 1000 °C, were considered. The temperature distributions in the specimens during the heating and cooling process and the related mechanical behavior of the specimens, such as load versus longitudinal displacement and rotation responses, load-bearing capacities, and strain distributions, were obtained and analyzed. Finite element analysis (FEA), including both heat transfer and mechanical analysis, were also developed using the ABAQUS software. Having validated the FE models against the experimental results, a design method was proposed on the basis of parametric studies to predict the residual load-bearing capacity of eccentrically loaded welded hollow spherical joints after fire exposure.

  • behavior of welded hollow spherical joints after exposure to iso 834 standard fire
    Journal of Constructional Steel Research, 2018
    Co-Authors: Hongbo Liu, Zhihua Chen
    Abstract:

    Abstract Welded hollow spherical joints are extensively used as a connection pattern in Space Lattice structures. Provided that structural collapse does not occur after a fire, a reliable evaluation of the residual performances of the structures is necessary to decide whether the structures should be dismantled, repaired, or directly reused. Thus, understanding the post-fire residual behavior of welded hollow spherical joints, which act as key connection elements, is crucial for fire damage assessment of the Space Lattice structures. In this paper, experimental and numerical studies were conducted to reveal the residual structural behavior of welded hollow spherical joints after fire exposure. Axial compressive tests were performed on eight joint specimens after exposure to the ISO-834 standard fire (including both heating and cooling phases), and three highest fire temperatures, i.e., 600 °C, 800 °C, and 1000 °C, were considered. The temperature distributions in the specimens during the heating and cooling process and the related mechanical behavior of the specimens, such as axial load–displacement curves, initial axial stiffness, yield loads, load-bearing capacities, ductility level, and strain distributions, were obtained and analyzed. Finite element analysis (FEA), including both heat transfer and stress analysis, were also developed using the ABAQUS software. Having validated the FE models against the experimental results, a design method was proposed on the basis of parametric studies to predict both the residual load-bearing capacity and initial axial stiffness of welded hollow spherical joints after fire exposure.

Han Cai - One of the best experts on this subject based on the ideXlab platform.

  • many body chiral edge currents and sliding phases of atomic spin waves in momentum Space Lattice
    Physical Review Letters, 2020
    Co-Authors: Han Cai, Dawei Wang, Jianmin Yuan
    Abstract:

    Collective excitations (spin waves) of long-lived atomic hyperfine states can be synthesized into a Bose-Hubbard model in momentum Space. We explore many-body ground states and dynamics of a two-leg momentum-Space Lattice formed by two coupled hyperfine states. Essential ingredients of this setting are a staggered artificial magnetic field engineered by lasers that couple the spin wave states and a state-dependent long-range interaction, which is induced by laser dressing a hyperfine state to a Rydberg state. The Rydberg dressed two-body interaction gives rise to a state-dependent blockade in momentum Space and can amplify staggered flux-induced antichiral edge currents in the many-body ground state in the presence of magnetic flux. When the Rydberg dressing is applied to both hyperfine states, exotic sliding insulating and superfluid (supersolid) phases emerge. Because of the Rydberg dressed long-range interaction, spin waves slide along a leg of the momentum-Space Lattice without costing energy. Our study paves a route to the quantum simulation of topological phases and exotic dynamics with interacting spin waves of atomic hyperfine states in momentum-Space Lattice.