The Experts below are selected from a list of 2238 Experts worldwide ranked by ideXlab platform

Katrin Beyer - One of the best experts on this subject based on the ideXlab platform.

  • force displacement response of in plane loaded unreinforced brick masonry walls the critical Diagonal Crack model
    Bulletin of Earthquake Engineering, 2017
    Co-Authors: Bastian Valentin Wilding, Katrin Beyer
    Abstract:

    This article introduces an analytical model to compute the monotonic force–displacement response of in-plane loaded unreinforced brick masonry walls accounting for walls failing in shear or flexure. The masonry wall is modelled as elastic in compression with zero tensile strength using a Timoshenko beam element. Its cross-section properties (moment of inertia and area) are continuously updated to capture the non-linearity that results from flexural and shear Cracking. For this purpose, Diagonal Cracking of shear critical walls is represented by one Critical Diagonal Crack. The ultimate drift capacity of the wall is determined based on an approach evaluating a plastic zone at the wall toe. Validation against results of cyclic full-scale tests of unreinforced masonry walls made with vertically perforated clay units shows that the presented formulation is capable of accurately predicting the effective stiffness, the maximum strength and the ultimate drift capacity of the wall. It outperforms current empirical code equations with regard to stiffness and ultimate drift capacity estimates and yields similar results concerning strength prediction.

  • Force–displacement response of in-plane loaded unreinforced brick masonry walls: the Critical Diagonal Crack model
    Bulletin of Earthquake Engineering, 2017
    Co-Authors: Bastian Valentin Wilding, Katrin Beyer
    Abstract:

    This article introduces an analytical model to compute the monotonic force–displacement response of in-plane loaded unreinforced brick masonry walls accounting for walls failing in shear or flexure. The masonry wall is modelled as elastic in compression with zero tensile strength using a Timoshenko beam element. Its cross-section properties (moment of inertia and area) are continuously updated to capture the non-linearity that results from flexural and shear Cracking. For this purpose, Diagonal Cracking of shear critical walls is represented by one Critical Diagonal Crack. The ultimate drift capacity of the wall is determined based on an approach evaluating a plastic zone at the wall toe. Validation against results of cyclic full-scale tests of unreinforced masonry walls made with vertically perforated clay units shows that the presented formulation is capable of accurately predicting the effective stiffness, the maximum strength and the ultimate drift capacity of the wall. It outperforms current empirical code equations with regard to stiffness and ultimate drift capacity estimates and yields similar results concerning strength prediction.

Bastian Valentin Wilding - One of the best experts on this subject based on the ideXlab platform.

  • force displacement response of in plane loaded unreinforced brick masonry walls the critical Diagonal Crack model
    Bulletin of Earthquake Engineering, 2017
    Co-Authors: Bastian Valentin Wilding, Katrin Beyer
    Abstract:

    This article introduces an analytical model to compute the monotonic force–displacement response of in-plane loaded unreinforced brick masonry walls accounting for walls failing in shear or flexure. The masonry wall is modelled as elastic in compression with zero tensile strength using a Timoshenko beam element. Its cross-section properties (moment of inertia and area) are continuously updated to capture the non-linearity that results from flexural and shear Cracking. For this purpose, Diagonal Cracking of shear critical walls is represented by one Critical Diagonal Crack. The ultimate drift capacity of the wall is determined based on an approach evaluating a plastic zone at the wall toe. Validation against results of cyclic full-scale tests of unreinforced masonry walls made with vertically perforated clay units shows that the presented formulation is capable of accurately predicting the effective stiffness, the maximum strength and the ultimate drift capacity of the wall. It outperforms current empirical code equations with regard to stiffness and ultimate drift capacity estimates and yields similar results concerning strength prediction.

  • Force–displacement response of in-plane loaded unreinforced brick masonry walls: the Critical Diagonal Crack model
    Bulletin of Earthquake Engineering, 2017
    Co-Authors: Bastian Valentin Wilding, Katrin Beyer
    Abstract:

    This article introduces an analytical model to compute the monotonic force–displacement response of in-plane loaded unreinforced brick masonry walls accounting for walls failing in shear or flexure. The masonry wall is modelled as elastic in compression with zero tensile strength using a Timoshenko beam element. Its cross-section properties (moment of inertia and area) are continuously updated to capture the non-linearity that results from flexural and shear Cracking. For this purpose, Diagonal Cracking of shear critical walls is represented by one Critical Diagonal Crack. The ultimate drift capacity of the wall is determined based on an approach evaluating a plastic zone at the wall toe. Validation against results of cyclic full-scale tests of unreinforced masonry walls made with vertically perforated clay units shows that the presented formulation is capable of accurately predicting the effective stiffness, the maximum strength and the ultimate drift capacity of the wall. It outperforms current empirical code equations with regard to stiffness and ultimate drift capacity estimates and yields similar results concerning strength prediction.

Xiangsen Ouyang - One of the best experts on this subject based on the ideXlab platform.

  • Analysis of the Fracture Characteristics and the Stress Intensity Factor of the Symmetric Coalescence Crack in Rock
    Geotechnical and Geological Engineering, 2018
    Co-Authors: Xiangsen Ouyang
    Abstract:

    The present article proposed the analytic solution for the stress intensity factor of the symmetric coalescence Crack, and then the effect of the Crack propagation direction and the geometry characteristics on the stress intensity factor was discussed. The stress intensity factors of the central symmetric Cracks, the edge symmetric Cracks and the Diagonal symmetric Cracks were analyzed using the weight function method for various geometry sizes. In addition, we discussed the propagation direction of the coalescence Cracks and introduced the dimensionless stress intensity factor to study the effect of the geometry characteristics on the stress intensity factor. Moreover, the theoretical results were verified by a numerical tests applying FLAC 3D. The results show that the stress intensity factor decreased and then remained at an asymptotic value with the increase in the intersection angle. Simultaneously, the magnitudes of the stress intensity factors for the mode-I and mode-II Cracks decreased in the order of the Diagonal Crack, the central Crack and the edge Crack.

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

  • corner Cracking model for non uniform corrosion caused deterioration of concrete covers
    Construction and Building Materials, 2020
    Co-Authors: Yanlong Zhang, R K L Su
    Abstract:

    Abstract The failure of concrete covers due to corrosion of the corner rebars is different from that of the interior rebars. To date, there is no specific analytical model for simulating corner Cracking in the literature. In response, this paper proposes a novel analytical model, which considers both the non-uniform distribution of rust and the boundary conditions of the cover surface, to study the process and propagation of corner Cracking. This nondestructive evaluation method is capable of obtaining the volume of corroded steel by measuring the bulging of the cover surface and/or the Crack opening. This model has been verified by comparing the analytical results with the numerical results. Using the verified analytical model, the effects of the tensile strength of concrete, cover thickness, rebar diameter and Diagonal Crack angle on the bulging of the cover surface and Crack opening are studied, which provide useful information for the design and prediction of the service life and Crack width in reinforced concrete structures.

  • a novel elastic body rotation model for concrete cover spalling caused by non uniform corrosion of reinforcement
    Construction and Building Materials, 2019
    Co-Authors: R K L Su, Yanlong Zhang
    Abstract:

    Abstract A novel elastic-body-rotation model is proposed to analyze the mechanism and the process of cover Cracking and spalling caused by the non-uniform corrosion of widely spaced reinforcements. The width of the cover surface Cracks, bulging of the concrete surface and maximum thickness of the corroded steel can be predicted by using the proposed model. The predicted bulging of the concrete cover has been validated by the experimental and numerical results. Using the validated model, the effects of the Diagonal Crack angle, tensile strength of concrete and cover thickness on the bulging of the cover surface and the thickness of the corroded steel for initiating and widening Cracks are investigated with a parametric study. It is found that the Diagonal Cracking angle has a major influence on the cover surface Crack width. In addition, the degree of corrosion in rebars and the width of internal Diagonal Cracks can be evaluated by simply measuring the width of surface Cracks or the bulging of cover surface.

R K L Su - One of the best experts on this subject based on the ideXlab platform.

  • corner Cracking model for non uniform corrosion caused deterioration of concrete covers
    Construction and Building Materials, 2020
    Co-Authors: Yanlong Zhang, R K L Su
    Abstract:

    Abstract The failure of concrete covers due to corrosion of the corner rebars is different from that of the interior rebars. To date, there is no specific analytical model for simulating corner Cracking in the literature. In response, this paper proposes a novel analytical model, which considers both the non-uniform distribution of rust and the boundary conditions of the cover surface, to study the process and propagation of corner Cracking. This nondestructive evaluation method is capable of obtaining the volume of corroded steel by measuring the bulging of the cover surface and/or the Crack opening. This model has been verified by comparing the analytical results with the numerical results. Using the verified analytical model, the effects of the tensile strength of concrete, cover thickness, rebar diameter and Diagonal Crack angle on the bulging of the cover surface and Crack opening are studied, which provide useful information for the design and prediction of the service life and Crack width in reinforced concrete structures.

  • a novel elastic body rotation model for concrete cover spalling caused by non uniform corrosion of reinforcement
    Construction and Building Materials, 2019
    Co-Authors: R K L Su, Yanlong Zhang
    Abstract:

    Abstract A novel elastic-body-rotation model is proposed to analyze the mechanism and the process of cover Cracking and spalling caused by the non-uniform corrosion of widely spaced reinforcements. The width of the cover surface Cracks, bulging of the concrete surface and maximum thickness of the corroded steel can be predicted by using the proposed model. The predicted bulging of the concrete cover has been validated by the experimental and numerical results. Using the validated model, the effects of the Diagonal Crack angle, tensile strength of concrete and cover thickness on the bulging of the cover surface and the thickness of the corroded steel for initiating and widening Cracks are investigated with a parametric study. It is found that the Diagonal Cracking angle has a major influence on the cover surface Crack width. In addition, the degree of corrosion in rebars and the width of internal Diagonal Cracks can be evaluated by simply measuring the width of surface Cracks or the bulging of cover surface.