The Experts below are selected from a list of 9681 Experts worldwide ranked by ideXlab platform

C. Guedes Soares - One of the best experts on this subject based on the ideXlab platform.

  • Experimental Evaluation of the Ultimate Bending Moment of a Slender Thin-Walled Box Girder
    Journal of Offshore Mechanics and Arctic Engineering, 2015
    Co-Authors: J.m. Gordo, C. Guedes Soares
    Abstract:

    The results of a four points bending test on a Box girder are presented. The experiment is part of series of tests with similar configuration but with different thickness and span between frames. The present work refers to the slenderest Plate Box girder with a Plate's thickness of 2 mm but with a short span between frames. The experiment includes initial loading cycles allowing for partial relief of residual stresses. The moment curvature relationship is established for a large range of curvature. The ultimate bending moment (UM) of the Box is evaluated and compared with the first yield moment and the plastic moment allowing the evaluation of the efficiency of the structure. The postbuckling behavior and collapse mode are characterized. Comparison of the experiment with a progressive collapse analysis method is made taking into consideration the effect of residual stresses on envelop of the moment curvature curve of the structure.

  • Experimental Evaluation of the Ultimate Bending Moment of a Thin Box Girder
    Volume 4B: Structures Safety and Reliability, 2014
    Co-Authors: J.m. Gordo, C. Guedes Soares
    Abstract:

    The results of a four points bending test on a Box girder are presented. The experiment is part of series of tests with similar configuration but different thickness and span between frames. The present work refers to the slenderest Plate Box girder with a Plate’s thickness of 2 mm but with a short span between frames. The experiment includes initial loading cycles allowing for residual stresses relief. The moment curvature relationship is established for a large range of curvature. The ultimate bending moment of the Box is evaluated and compared with the first yield moment and the plastic moment allowing the evaluation of the efficiency of the structure. The post buckling behavior and collapse mode are characterized. Comparison of the experiment with a progressive collapse method is made taking into consideration the effect of residual stresses on envelop of the moment curvature curve of the structure.Copyright © 2014 by ASME

J.m. Gordo - One of the best experts on this subject based on the ideXlab platform.

  • Pure Bending Test on a Box Girder With Low Panel’s Slenderness
    Volume 11B: Honoring Symposium for Professor Carlos Guedes Soares on Marine Technology and Ocean Engineering, 2018
    Co-Authors: J.m. Gordo, Carlos Guedes Soares
    Abstract:

    The results of a four points bending test on a Box girder are presented. The experiment is part of series of tests with similar configuration but different thickness, spacing between longitudinal stiffeners and span between frames. The present work refers to the stockiest Plate Box girder with a Plate’s thickness of 4 mm and a span between frames of 800 mm. The experiment includes initial loading cycles allowing for residual stresses relief. It also includes a series of cycles close to collapse load allowing the analysis of linear characteristic at high levels of load.The moment curvature relationship is established for a large range of curvatures. The ultimate bending moment of the Box is evaluated and compared with the first yield moment and the plastic moment allowing the evaluation of the efficiency of the structure. The post buckling behavior and collapse mode are characterized. Comparison of the experiment with a progressive collapse method is made taking into consideration the effect of residual stresses on envelop of the moment curvature curve of the structure.Copyright © 2018 by ASME

  • Experimental Evaluation of the Ultimate Bending Moment of a Slender Thin-Walled Box Girder
    Journal of Offshore Mechanics and Arctic Engineering, 2015
    Co-Authors: J.m. Gordo, C. Guedes Soares
    Abstract:

    The results of a four points bending test on a Box girder are presented. The experiment is part of series of tests with similar configuration but with different thickness and span between frames. The present work refers to the slenderest Plate Box girder with a Plate's thickness of 2 mm but with a short span between frames. The experiment includes initial loading cycles allowing for partial relief of residual stresses. The moment curvature relationship is established for a large range of curvature. The ultimate bending moment (UM) of the Box is evaluated and compared with the first yield moment and the plastic moment allowing the evaluation of the efficiency of the structure. The postbuckling behavior and collapse mode are characterized. Comparison of the experiment with a progressive collapse analysis method is made taking into consideration the effect of residual stresses on envelop of the moment curvature curve of the structure.

  • Experimental Evaluation of the Ultimate Bending Moment of a Thin Box Girder
    Volume 4B: Structures Safety and Reliability, 2014
    Co-Authors: J.m. Gordo, C. Guedes Soares
    Abstract:

    The results of a four points bending test on a Box girder are presented. The experiment is part of series of tests with similar configuration but different thickness and span between frames. The present work refers to the slenderest Plate Box girder with a Plate’s thickness of 2 mm but with a short span between frames. The experiment includes initial loading cycles allowing for residual stresses relief. The moment curvature relationship is established for a large range of curvature. The ultimate bending moment of the Box is evaluated and compared with the first yield moment and the plastic moment allowing the evaluation of the efficiency of the structure. The post buckling behavior and collapse mode are characterized. Comparison of the experiment with a progressive collapse method is made taking into consideration the effect of residual stresses on envelop of the moment curvature curve of the structure.Copyright © 2014 by ASME

Yading Zhao - One of the best experts on this subject based on the ideXlab platform.

  • Crack Detection of Orthotropic Plate Box Girder Bridges Based on FBG Strain Sensors
    Structural Health Monitoring 2017, 2017
    Co-Authors: Shiyin Wei, Yading Zhao
    Abstract:

    Serving as one of the most common measurements in the instrumented Structural Health Monitoring system of bridges, strain response measurement, especially longterm measurement on a continuous basis can provide ongoing information of bridge structures on its structural behavior and health condition under external load. However, the study on strain response is far from adequate. Based on the Fiber Bragg Grating (FBG) strain sensors, this paper conduct a study on the strain response feature of steel Box girder on the important elements and critical locations, and develop a statistical paradigm for crack detection. The local response property of strain response under vehicle load is highlighted, since it enables the measurement data to tell the vehicle load events that occur to the area nearby the sensors and to tell the health condition of this area. Features of strain response subject to vehicle load is first studied, its timefrequency domain feature is used to detect vehicle load events and break the strain measurement series into segments that corresponded to the detected vehicle load events. Based on the matching technique of segments of strain series from successive sections along the traffic direction, strain response segments of different sections under the identical vehicle load is obtained. Extracting the amplitude of their changes in the value subject to the identical vehicle load and evaluating their mutual ratio (the indicator) to mitigate eliminate different affects due to vehicle weight for each passing heavy vehicle (sample), the paradigm finally collects a dataset of the condition of different sections, by analysing the statistical property of this indicator, it detects the crack on the nearby region of the sensor location and infer the condition of this region.

M. A. Jafari - One of the best experts on this subject based on the ideXlab platform.

  • Seismic performance of Box-Plate, Box-Plate with UNP, Box-Plate with L-Plate and ordinary rigid beam-to-column moment connections
    JVE International, 2018
    Co-Authors: A. Shishegaran, A. Amiri, M. A. Jafari
    Abstract:

    Nowadays, using high-ductility structures in construction and significant buildings is highly appreciated. To use better ductile structures, effort has been made in this research to introduce Box-Plate, Box-Plate with UNP, Box-Plate with L-Plate and ordinary beam-to-column connections. Eleven models with different shapes and thickness were analyzed and compared in this research, and they underwent hysteretic loading. Parameters such as restraint percentage, stiffness, strength, plastic hinge location, and ductility under cyclic loads were calculated for each model. It was found, from their moment-rotation curves that the bending capacity and ductility of the Box-Plate with UNP connection was greater than any other rigid connections, and those of the latter were greater than those of the normal, typical ones. It was also shown that stress concentration in Box-Plate with UNP connections disappear over the top and bottom flange Plates

Vickie J. Smith - One of the best experts on this subject based on the ideXlab platform.

  • Field evaluation of a habitat-relation model for the American marten
    Wildlife Society Bulletin, 2002
    Co-Authors: Dorothy M. Fecske, Jonathan A. Jenks, Vickie J. Smith
    Abstract:

    Monitoring programs aimed at indicator species like the American marten (Martes americana) may index ecosystem conditions throughout the animal's range. Habitat-relation models may be useful to monitor indicator species and their habitats temporally. We constructed and field-tested a habitat-relation model for American martens to determine current distribution of the species in the Black Hills, South Dakota and establish baseline data for the population. We conducted a track-Plate-Box survey, selecting survey quadrats using the model, field reconnaissance, and area used by radiocollared martens. We performed stepwise logistic regression to test the model and predict the presence of martens in random quadrats throughout the study area and in quadrats surveyed by the United States Department of Agriculture (USDA) Forest Service. Of 46 10.2-km 2 quadrats surveyed, 14 (30%) had Boxes visited by martens. High-quality habitat was positively and low-quality habitat negatively correlated to martens' presence. Logistic model coefficients predicted that martens would be detected in 6 of 68 (9%) random quadrats. When field-tested (post-analysis), the model correctly predicted outcomes for 3 (60%) of 5 quadrats surveyed.