The Experts below are selected from a list of 20850 Experts worldwide ranked by ideXlab platform

Inhwa Chang - One of the best experts on this subject based on the ideXlab platform.

  • behavior of double skin Composite Wall subjected to in plane cyclic loading
    Journal of Structural Engineering-asce, 2009
    Co-Authors: Taesung Eom, Honggun Park, Cheolho Lee, Jinho Kim, Inhwa Chang
    Abstract:

    Double skin Composite Walls are composed of two steel plate "skins" connected by tie bars, with the space between them filled with concrete. They were developed to reduce Wall thickness, to enhance constructability, and to enable rapid construction by eliminating the use of formwork and reinforcing bars. In the present study, cyclic testing was performed to investigate the seismic behavior of isolated and coupled double skin Composite Walls with rectangular and T-shaped cross sections. The Wall specimens failed mainly by tensile fracture of the welded joints at the Wall base and coupling beams, or by local buckling of the steel plates. Because of their large depth, the ductility of the Wall specimens was not as good as that of beams having less depth. In particular, the ductility of the Walls was significantly affected by the strengthening methods used for the Wall base. The load-carrying capacities of the isolated and coupled Wall specimens were evaluated using plastic stress distributions in their cross sections, which provided satisfactory predictions.

Amit H Varma - One of the best experts on this subject based on the ideXlab platform.

  • behavior of steel plate Composite Wall piers under biaxial loading
    Journal of Structural Engineering-asce, 2019
    Co-Authors: Saahastaranshu R Bhardwaj, Amit H Varma, Nebojsa Orbovic
    Abstract:

    AbstractSteel-plate Composite (SC) structures may be subjected to combination of in-plane and out-of-plane forces for extreme loading combinations (e.g., seismic and accident thermal). This paper p...

  • finite element modeling of steel plate concrete Composite Wall piers
    Engineering Structures, 2015
    Co-Authors: Siamak Epackachi, Andrew S Whittaker, Amit H Varma, Efe G Kurt
    Abstract:

    Abstract A finite element model is developed in LS-DYNA to simulate the nonlinear cyclic response of flexure-critical steel-plate concrete (SC) Composite shear Walls. The developed finite element model is validated using data from tests of four large-scale SC Wall piers with an aspect ratio (height-to-length) of 1.0. Each SC Wall was constructed with steel faceplates, infill concrete, steel studs and tie rods, and a steel baseplate that was post-tensioned to a reinforced concrete foundation. Steel studs tied the faceplates to the infill concrete and the infill concrete to the baseplate. Damage to the SC Walls included cracking and crushing of the infill concrete and yielding, outward buckling and tearing of the steel faceplates. The finite element predictions include global force–displacement responses, equivalent viscous damping ratio, damage to the steel faceplates and infill concrete, strain and stress distributions in the steel faceplates, and estimates of the contribution of the steel faceplates and infill concrete to the lateral resistance of the Walls. The DYNA-predicted responses are in good agreement with the measured responses. The impacts of interface friction between the steel faceplates and the infill concrete, and of the distribution of shear studs on the baseplate, to the global response of the SC Walls are investigated using the validated DYNA model.

  • in plane seismic behavior of rectangular steel plate Composite Wall piers
    Journal of Structural Engineering-asce, 2015
    Co-Authors: Siamak Epackachi, Andrew S Whittaker, Efe G Kurt, Nam H Nguyen, Amit H Varma
    Abstract:

    AbstractAn experimental study investigated the behavior of large-scale steel-plate Composite (SC) Walls subjected to cyclic lateral loading. The testing program involved four rectangular SC Wall specimens with an aspect ratio (height-to-length) of 1.0. The specimens were anchored to a concrete basemat with a pretensioned bolted connection that was designed to be stronger than the Walls. The design parameters considered in the investigation were Wall thickness, reinforcement ratio, stud spacing, and tie bar spacing. The pretest analyses, global force-displacement responses, contributions of the steel faceplates and infill concrete to the lateral resistance, load transfer between the faceplates and infill concrete, and damage to the face plates and infill, are documented. The four SC Walls failed in a flexural mode characterized by tensile cracking of the concrete, tensile yielding of the steel plates, crushing of concrete at the toes of the Wall, outward local buckling of the steel faceplates, and fracture...

Taesung Eom - One of the best experts on this subject based on the ideXlab platform.

  • behavior of double skin Composite Wall subjected to in plane cyclic loading
    Journal of Structural Engineering-asce, 2009
    Co-Authors: Taesung Eom, Honggun Park, Cheolho Lee, Jinho Kim, Inhwa Chang
    Abstract:

    Double skin Composite Walls are composed of two steel plate "skins" connected by tie bars, with the space between them filled with concrete. They were developed to reduce Wall thickness, to enhance constructability, and to enable rapid construction by eliminating the use of formwork and reinforcing bars. In the present study, cyclic testing was performed to investigate the seismic behavior of isolated and coupled double skin Composite Walls with rectangular and T-shaped cross sections. The Wall specimens failed mainly by tensile fracture of the welded joints at the Wall base and coupling beams, or by local buckling of the steel plates. Because of their large depth, the ductility of the Wall specimens was not as good as that of beams having less depth. In particular, the ductility of the Walls was significantly affected by the strengthening methods used for the Wall base. The load-carrying capacities of the isolated and coupled Wall specimens were evaluated using plastic stress distributions in their cross sections, which provided satisfactory predictions.

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

  • numerical analysis on the thermal performance of a novel pcm encapsulated porous heat storage trombe Wall system
    Solar Energy, 2019
    Co-Authors: Wei Chen
    Abstract:

    Abstract Phase change material (PCM) applied in the architectural equipment can decrease building energy consumption and ameliorate thermal comfort by heightening its thermal energy storage capacity, and it has been a research hotspot in recent years. For the purpose of saving building energy in a simple and effective way, a novel solar Composite Wall with a porous heat storage layer in the present paper, and its matrix consists of the PCM encapsulated granular capsules, so the phase change occurs in the encapsulated capsules when the temperature reaches the melting point. The unsteady numerical simulation is conducted to analyze the performance of passive solar heating room. In the daytime, a large amount of heat can be stored in the porous layer due to the occurrence of phase change in the capsules, once the temperature of porous layer is above a certain value. The heat can be released at night or in a cloudy day when the temperature is below the solidification temperature, thus, the overheating can be avoided in the room and the heat can be fully utilized. The comparisons are conducted between the porous layer with and without PCM encapsulated granular capsules in the Composite Wall for heating. And in comparison with the granular capsules-consisted porous layer which without PCM, approximate 20.2% increment of average temperature at night can be achieved in the heating room when the PCM is packaged in the porous layer. The thermal efficiency of the PCM heat storage Wall is 76.2%. Besides, the structure parameters and combined modes in the porous Composite solar Wall are analyzed. For instance, the porous storage Wall with a porosity of 0.1 and a thickness of 6 cm are reasonable choices in this model.

  • numerical analysis of heat transfer in a Composite Wall solar collector system with a porous absorber
    Applied Energy, 2004
    Co-Authors: Wei Chen, Wei Liu
    Abstract:

    In this paper, heat transfer and air flow in a Composite-Wall solar-collector system with a porous absorber has been studied. The [`]unsteady' numerical simulation is conducted to analyze the performance of heat transfer and air flow in the Composite Wall. The excess heat is stored in the porous absorber by the incident solar radiation, which leads to a temperature gradient in the porous layer, so that the absorber can work as a good thermal-insulator when sunlight is not available. The influences of the particle size and the porosity of the porous absorber on the air temperature in the heated room are significant. The results show that all these factors should be taken into account for a better design of the passive solar-heating system.

Siamak Epackachi - One of the best experts on this subject based on the ideXlab platform.

  • finite element modeling of steel plate concrete Composite Wall piers
    Engineering Structures, 2015
    Co-Authors: Siamak Epackachi, Andrew S Whittaker, Amit H Varma, Efe G Kurt
    Abstract:

    Abstract A finite element model is developed in LS-DYNA to simulate the nonlinear cyclic response of flexure-critical steel-plate concrete (SC) Composite shear Walls. The developed finite element model is validated using data from tests of four large-scale SC Wall piers with an aspect ratio (height-to-length) of 1.0. Each SC Wall was constructed with steel faceplates, infill concrete, steel studs and tie rods, and a steel baseplate that was post-tensioned to a reinforced concrete foundation. Steel studs tied the faceplates to the infill concrete and the infill concrete to the baseplate. Damage to the SC Walls included cracking and crushing of the infill concrete and yielding, outward buckling and tearing of the steel faceplates. The finite element predictions include global force–displacement responses, equivalent viscous damping ratio, damage to the steel faceplates and infill concrete, strain and stress distributions in the steel faceplates, and estimates of the contribution of the steel faceplates and infill concrete to the lateral resistance of the Walls. The DYNA-predicted responses are in good agreement with the measured responses. The impacts of interface friction between the steel faceplates and the infill concrete, and of the distribution of shear studs on the baseplate, to the global response of the SC Walls are investigated using the validated DYNA model.

  • in plane seismic behavior of rectangular steel plate Composite Wall piers
    Journal of Structural Engineering-asce, 2015
    Co-Authors: Siamak Epackachi, Andrew S Whittaker, Efe G Kurt, Nam H Nguyen, Amit H Varma
    Abstract:

    AbstractAn experimental study investigated the behavior of large-scale steel-plate Composite (SC) Walls subjected to cyclic lateral loading. The testing program involved four rectangular SC Wall specimens with an aspect ratio (height-to-length) of 1.0. The specimens were anchored to a concrete basemat with a pretensioned bolted connection that was designed to be stronger than the Walls. The design parameters considered in the investigation were Wall thickness, reinforcement ratio, stud spacing, and tie bar spacing. The pretest analyses, global force-displacement responses, contributions of the steel faceplates and infill concrete to the lateral resistance, load transfer between the faceplates and infill concrete, and damage to the face plates and infill, are documented. The four SC Walls failed in a flexural mode characterized by tensile cracking of the concrete, tensile yielding of the steel plates, crushing of concrete at the toes of the Wall, outward local buckling of the steel faceplates, and fracture...