The Experts below are selected from a list of 13596 Experts worldwide ranked by ideXlab platform

L Vincetti - One of the best experts on this subject based on the ideXlab platform.

  • a simple analytical model for confinement loss estimation in hollow Core Tube lattice fibers
    Optics Express, 2019
    Co-Authors: L Vincetti, Lorenzo Rosa
    Abstract:

    In this work, we propose an analytical model for estimating confinement loss in Tube Lattice Fibers. It is based on the single-Tube model and the inhibited coupling waveguiding mechanism. The comparison with numerical simulations of Tube lattice fibers having different geometrical parameters and dielectric refractive indexes demonstrates the model validity and effectiveness. Being based only on analytical closed formulas, it constitutes a useful tool for rapid estimation of TLF CL. It also gives a more in-depth insight into the TLF guiding mechanisms, confirming the inhibited coupling is an appropriate and effective model for such kind of fibers.

  • empirical formulas for calculating loss in hollow Core Tube lattice fibers
    Optics Express, 2016
    Co-Authors: L Vincetti
    Abstract:

    In this paper scaling laws governing loss in hollow Core Tube lattice fibers are numerically investigated and discussed. Moreover, by starting from the analysis of the obtained numerical results, empirical formulas for the estimation of the minimum values of confinement loss, absorption loss, and surface scattering loss inside the transmission band are obtained. The proposed formulas show a good accuracy for fibers designed for applications ranging from THz to ultra violet band.

Zi Yang - One of the best experts on this subject based on the ideXlab platform.

  • shaking table test and numerical simulation of an rc frame Core Tube structure for earthquake induced collapse
    Earthquake Engineering & Structural Dynamics, 2016
    Co-Authors: Xiaoyi Chen, Zi Yang
    Abstract:

    Summary The reinforced concrete frame-Core Tube structure is a common form of high-rise building; however, certain vertical components of these structures are prone to be damaged by earthquakes, debris flow, or other accidents, leaving no time for repair or retrofit. This study is motivated by a practical problem—that is, the seismic vulnerability and collapse resistant capability under future earthquakes when a vertical member has failed. A reduced scale model (1:15 scale) of a typical reinforced concrete frame-Core Tube with a corner column removed from the first floor is designed, fabricated, and tested. The corner column is replaced by a jack, and the failure behavior is simulated by manually unloading the jack. The model is then excited by a variety of seismic ground motions on the shaking table. Experimental results concerning the seismic responses and actual process of collapse are presented herein. Finally, the earthquake-induced collapse process is simulated numerically using the software program ANSYS/LS-DYNA. Validation and calibration of the model are carried out by comparison with the experimental results. Furthermore, based on both experimental investigations and numerical simulations, the collapse mechanism is discussed, and some suggestions on collapse design are put forward. Copyright © 2016 John Wiley & Sons, Ltd.

  • Shaking table test and numerical simulation of an RC frame‐Core Tube structure for earthquake‐induced collapse
    Earthquake Engineering & Structural Dynamics, 2016
    Co-Authors: Zheng Lu, Xilin Lu, Xiaoyi Chen, Zi Yang
    Abstract:

    Summary The reinforced concrete frame-Core Tube structure is a common form of high-rise building; however, certain vertical components of these structures are prone to be damaged by earthquakes, debris flow, or other accidents, leaving no time for repair or retrofit. This study is motivated by a practical problem—that is, the seismic vulnerability and collapse resistant capability under future earthquakes when a vertical member has failed. A reduced scale model (1:15 scale) of a typical reinforced concrete frame-Core Tube with a corner column removed from the first floor is designed, fabricated, and tested. The corner column is replaced by a jack, and the failure behavior is simulated by manually unloading the jack. The model is then excited by a variety of seismic ground motions on the shaking table. Experimental results concerning the seismic responses and actual process of collapse are presented herein. Finally, the earthquake-induced collapse process is simulated numerically using the software program ANSYS/LS-DYNA. Validation and calibration of the model are carried out by comparison with the experimental results. Furthermore, based on both experimental investigations and numerical simulations, the collapse mechanism is discussed, and some suggestions on collapse design are put forward. Copyright © 2016 John Wiley & Sons, Ltd.

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

  • shaking table test and numerical simulation of an rc frame Core Tube structure for earthquake induced collapse
    Earthquake Engineering & Structural Dynamics, 2016
    Co-Authors: Xiaoyi Chen, Zi Yang
    Abstract:

    Summary The reinforced concrete frame-Core Tube structure is a common form of high-rise building; however, certain vertical components of these structures are prone to be damaged by earthquakes, debris flow, or other accidents, leaving no time for repair or retrofit. This study is motivated by a practical problem—that is, the seismic vulnerability and collapse resistant capability under future earthquakes when a vertical member has failed. A reduced scale model (1:15 scale) of a typical reinforced concrete frame-Core Tube with a corner column removed from the first floor is designed, fabricated, and tested. The corner column is replaced by a jack, and the failure behavior is simulated by manually unloading the jack. The model is then excited by a variety of seismic ground motions on the shaking table. Experimental results concerning the seismic responses and actual process of collapse are presented herein. Finally, the earthquake-induced collapse process is simulated numerically using the software program ANSYS/LS-DYNA. Validation and calibration of the model are carried out by comparison with the experimental results. Furthermore, based on both experimental investigations and numerical simulations, the collapse mechanism is discussed, and some suggestions on collapse design are put forward. Copyright © 2016 John Wiley & Sons, Ltd.

  • Shaking table test and numerical simulation of an RC frame‐Core Tube structure for earthquake‐induced collapse
    Earthquake Engineering & Structural Dynamics, 2016
    Co-Authors: Zheng Lu, Xilin Lu, Xiaoyi Chen, Zi Yang
    Abstract:

    Summary The reinforced concrete frame-Core Tube structure is a common form of high-rise building; however, certain vertical components of these structures are prone to be damaged by earthquakes, debris flow, or other accidents, leaving no time for repair or retrofit. This study is motivated by a practical problem—that is, the seismic vulnerability and collapse resistant capability under future earthquakes when a vertical member has failed. A reduced scale model (1:15 scale) of a typical reinforced concrete frame-Core Tube with a corner column removed from the first floor is designed, fabricated, and tested. The corner column is replaced by a jack, and the failure behavior is simulated by manually unloading the jack. The model is then excited by a variety of seismic ground motions on the shaking table. Experimental results concerning the seismic responses and actual process of collapse are presented herein. Finally, the earthquake-induced collapse process is simulated numerically using the software program ANSYS/LS-DYNA. Validation and calibration of the model are carried out by comparison with the experimental results. Furthermore, based on both experimental investigations and numerical simulations, the collapse mechanism is discussed, and some suggestions on collapse design are put forward. Copyright © 2016 John Wiley & Sons, Ltd.

Zhang Jun - One of the best experts on this subject based on the ideXlab platform.

  • Vibration Characteristic of Core-Tube Suspended Structure Subjected to Multi-Dimension Seismic Coupling Excitation
    Computer Simulation, 2011
    Co-Authors: Zhang Jun
    Abstract:

    This paper analysed the mode of Core-Tube suspended structure and studied its response under multi-dimension seismic coupling excitation.The floor-model which is always used by the traditional seismic analysis has a good adaptability of calculating the horizontal vibration,but it is not very accurate when it comes to vertical vibration.This research used the series-parallel-connection model to simplify structure and chose actual earthquake record to establish the equation.Solved the equation by using direct-integration method,we can get the each node response.By comparison with single-dimension seismic excitation,the response of some components have a significant difference.The conclusion helps the mastery of Core-Tube suspended structure vibration characteristic and can be refered for the further research and design.

Finn A. Viehberg - One of the best experts on this subject based on the ideXlab platform.

  • New methods for extruding and cutting of sediment Cores
    Journal of Paleolimnology, 2015
    Co-Authors: Burkhard Scharf, Janusz Kmiecik, Finn A. Viehberg
    Abstract:

    We developed and improved methods to extrude sediment out of Core Tubes and to cut defined layers of sediment in the field. For extrusion we use standard connectable 50-cm sewage Tubes or aluminum rods with two lines of holes vertically in equidistance of 0.5 or 1 cm. A stopper at the bottom of the Core Tube is placed on top of the extruder and the Core Tube is pushed downwards and stopped by distance pins in the holes. The extruder is independent of the length and diameter of the Core Tube. A modification of the extrusion equipment can be used for checking lamination of the sediment in the field. In addition, a rubber stopper is described for the extrusion of sandy sediment out of the Core Tube. A PVC-Core cutter is presented that is also capable of sampling watery sediments, and it prevents contamination with metal. The advantages of these devices are the simplicity, handling, robustness and cost efficiency.