The Experts below are selected from a list of 7401 Experts worldwide ranked by ideXlab platform

Daniel A Kuchma - One of the best experts on this subject based on the ideXlab platform.

  • seismic fragility relationships of reinforced concrete high rise buildings
    Structural Design of Tall and Special Buildings, 2009
    Co-Authors: Amr S Elnashai, Daniel A Kuchma
    Abstract:

    A complete methodology is presented for the seismic fragility assessment of reinforced concrete high-rise buildings. The key steps of the methodology are illustrated through an example of the fragility assessment of an existing 54-story building with a dual Core Wall System. The set of rigorously derived probabilistic fragilities are the first published for high-rise reinforced concrete buildings. The inelastic nonlinear dynamic analyses for the fragility assessments are made using a simplified lumped-parameter model that was derived from highly detailed FE models using genetic algorithms. New definitions for performance limit states were based on the results of detailed pushover analyses of a distributed inelastic nonlinear finite element model that includes shear–flexure–axial interaction effects. To develop the fragility relationships, 1800 dynamic response history analyses were conducted. This study considered uncertainty in structural material values as well as in seismic demand. Thirty strong motion records were selected for use in the analyses that would produce an appropriate range in structural response characteristics due to variation in magnitude, distance and site condition. The overall approach is generic and can be applied to developing computationally efficient and probabilistically-based seismic fragility relationships for reinforced concrete high-rise buildings of different configurations. Copyright © 2007 John Wiley & Sons, Ltd.

Xiaowei Cheng - One of the best experts on this subject based on the ideXlab platform.

  • Numerical Modelling of Reinforced Concrete Slender Walls Subjected to Coupled Axial Tension–Flexure
    'Springer Science and Business Media LLC', 2021
    Co-Authors: Xiaowei Cheng, Haoyou Zhang
    Abstract:

    Abstract Under strong earthquakes, reinforced concrete (RC) Walls in high-rise buildings, particularly in Wall piers that form part of a coupled or Core Wall System, may experience coupled axial tension–flexure loading. In this study, a detailed finite element model was developed in VecTor2 to provide an effective tool for the further investigation of the seismic behaviour of RC Walls subjected to axial tension and cyclic lateral loading. The model was verified using experimental data from recent RC Wall tests under axial tension and cyclic lateral loading, and results showed that the model can accurately capture the overall response of RC Walls. Additional analyses were conducted using the developed model to investigate the effect of key design parameters on the peak strength, ultimate deformation capacity and plastic hinge length of RC Walls under axial tension and cyclic lateral loading. On the basis of the analysis results, useful information were provided when designing or assessing the seismic behaviour of RC slender Walls under coupled axial tension–flexure loading

  • coupled axial tension flexure behavior of slender reinforced concrete Walls
    Engineering Structures, 2019
    Co-Authors: Xiaowei Cheng, Xiaodong Ji, Richard Henry, Mengchao Xu
    Abstract:

    Abstract Reinforced concrete (RC) Walls in high-rise buildings, in particular Wall piers that form part of a coupled or Core Wall System, may experience coupled axial tension-flexure loading when subjected to lateral demands. The seismic behavior of RC Walls with various axial tensile forces was investigated by quasi-static tests on four RC slender Walls subjected to the combined tension and flexure loading. The failure modes, strength and deformation capacity, effective flexural stiffness, and design equations are presented. The failure modes included flexural-sliding failure and flexural failure. The effective flexural stiffness and lateral strength of the Walls significantly decreased as the axial tensile forces were increased. The ACI 318-14 and ASCE/SEI 41-13 code provisions overestimated the effective flexural stiffness of RC Walls subjected to axial tension. Although equations proposed by Paulay & Priestley and Adebar et al. consider the influence of axial forces, they were not able to accurately predict the effective flexural stiffness of the RC Wall specimens subjected to tensile forces. Both sectional analysis using XTRACT and JGJ 3-2010 (China) code equations provided accurate estimation of the flexural yield strength of Walls. Finally, both a refined model and simplified equation were proposed to estimate the axial elongation for RC slender Walls subjected to axial tensile force and cyclic lateral loading.

Amr S Elnashai - One of the best experts on this subject based on the ideXlab platform.

  • seismic fragility relationships of reinforced concrete high rise buildings
    Structural Design of Tall and Special Buildings, 2009
    Co-Authors: Amr S Elnashai, Daniel A Kuchma
    Abstract:

    A complete methodology is presented for the seismic fragility assessment of reinforced concrete high-rise buildings. The key steps of the methodology are illustrated through an example of the fragility assessment of an existing 54-story building with a dual Core Wall System. The set of rigorously derived probabilistic fragilities are the first published for high-rise reinforced concrete buildings. The inelastic nonlinear dynamic analyses for the fragility assessments are made using a simplified lumped-parameter model that was derived from highly detailed FE models using genetic algorithms. New definitions for performance limit states were based on the results of detailed pushover analyses of a distributed inelastic nonlinear finite element model that includes shear–flexure–axial interaction effects. To develop the fragility relationships, 1800 dynamic response history analyses were conducted. This study considered uncertainty in structural material values as well as in seismic demand. Thirty strong motion records were selected for use in the analyses that would produce an appropriate range in structural response characteristics due to variation in magnitude, distance and site condition. The overall approach is generic and can be applied to developing computationally efficient and probabilistically-based seismic fragility relationships for reinforced concrete high-rise buildings of different configurations. Copyright © 2007 John Wiley & Sons, Ltd.

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

  • Seismic Fragility Assessment for Reinforced Concrete High -Rise Buildings
    2026
    Co-Authors: Ji Jun
    Abstract:

    206 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2007.A complete methodology is proposed and demonstrated, containing the key steps of the methodology and the illustration through an example of the fragility assessment of an existing 54-storey building with a dual Core Wall System. The set of rigorously derived probabilistic fragilities are the first published for high-rise RC buildings, thus they fill an important void in regional earthquake impact assessment in Metropolitan communities. The inelastic dynamic analyses for the fragility assessments are undertaken using a simplified lumped-parameter model that was derived from highly detailed FE models using genetic algorithms. New definitions for performance limit states are based on the results of detailed pushover analyses of a multi-resolution distributed finite element model that includes shear-flexure-axial interaction effects. To develop the fragility relationships, more than two thousand dynamic response history analyses were conducted. This study considered uncertainty in structural material values as well as in seismic demand. Thirty natural and twenty artificial strong motion records were selected for the analyses that would produce an appropriate range in structural response parameters due to variation in magnitude, distance and site condition. The overall approach is generic and can be applied to develop computationally efficient and probabilistically based seismic fragility relationships for RC high-rise buildings of different configurations.U of I OnlyRestricted to the U of I community idenfinitely during batch ingest of legacy ETD

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

  • Numerical Modelling of Reinforced Concrete Slender Walls Subjected to Coupled Axial Tension–Flexure
    'Springer Science and Business Media LLC', 2021
    Co-Authors: Xiaowei Cheng, Haoyou Zhang
    Abstract:

    Abstract Under strong earthquakes, reinforced concrete (RC) Walls in high-rise buildings, particularly in Wall piers that form part of a coupled or Core Wall System, may experience coupled axial tension–flexure loading. In this study, a detailed finite element model was developed in VecTor2 to provide an effective tool for the further investigation of the seismic behaviour of RC Walls subjected to axial tension and cyclic lateral loading. The model was verified using experimental data from recent RC Wall tests under axial tension and cyclic lateral loading, and results showed that the model can accurately capture the overall response of RC Walls. Additional analyses were conducted using the developed model to investigate the effect of key design parameters on the peak strength, ultimate deformation capacity and plastic hinge length of RC Walls under axial tension and cyclic lateral loading. On the basis of the analysis results, useful information were provided when designing or assessing the seismic behaviour of RC slender Walls under coupled axial tension–flexure loading