The Experts below are selected from a list of 45 Experts worldwide ranked by ideXlab platform

Jeremy T Deason - One of the best experts on this subject based on the ideXlab platform.

  • outrigger Beam Wall connections i component testing and development of design model
    Journal of Structural Engineering-asce, 2004
    Co-Authors: Bahram M Shahrooz, Jeremy T Deason, Gokhan Tunc
    Abstract:

    A key factor behind successful performance of outrigger Beam–core Wall connections in hybrid structures is the adequacy of headed studs that are typically used to connect a stud plate, onto which the outrigger Beam is connected through a shear tab, to the Wall. In an effort to better understand cyclic behavior of stud groups under combined action of gravity shear and cyclic diaphragm forces, the research reported was undertaken. Six 1/3-scale subassemblies that involve a portion of the Wall, connection, and outrigger Beam were fabricated and tested. The test results suggest that a design method which closely follows available equations for computing stud capacity results in connections that reach the design loads; however, the mode of failure is stud pullout. This mode of failure does not have any ductility and lacks energy dissipation capabilities. Moreover, the available design equations fail to capture the substantial increase in strength due to Wall boundary element reinforcement around the studs. The...

  • outrigger Beam Wall connections ii subassembly testing and further modeling enhancements
    Journal of Structural Engineering-asce, 2004
    Co-Authors: Bahram M Shahrooz, Gokhan Tunc, Jeremy T Deason
    Abstract:

    Adequate strength of headed studs under cyclic loads is a prerequisite for satisfactory performance of outrigger Beam-core Wall connections that commonly use multiple headed studs. Previous studies have typically not investigated the effects of reinforcement around studs, and have not accounted for the effects of cracking, damage, and yielding of reinforcement on the strength of studs. To remedy these deficiencies, two 1/4-scale subassemblies that contain a cantilever Wall and two outrigger Beams with and without floor diaphragms were subjected to cyclic loading. The Wall reinforcement around the connection was selected according to the anticipated level of cracking and plastic hinge formation. The design methodology followed in this research resulted in connections that could develop and exceed the design forces despite extensive cracking and yielding of Wall reinforcement around the headed studs. The presence of heavily confined Wall boundary elements around headed studs increases the capacity. Simple methods to account for the influence of cracks and strengthening effects of boundary elements were developed. The resulting analytical model was able to accurately establish the expected mode of failure and capacity of outrigger Beam-Wall connections. For the outrigger Beam-Wall connection detail selected, the outrigger Beam was found to transfer the majority of diaphragm forces directly to the core Wall with negligible participation by the floor. Therefore, floor slab-Wall connections can be based on simple details that resist only gravity loads unless the connections are specifically designed to transfer the diaphragm forces to the Wall.

Gokhan Tunc - One of the best experts on this subject based on the ideXlab platform.

  • outrigger Beam Wall connections i component testing and development of design model
    Journal of Structural Engineering-asce, 2004
    Co-Authors: Bahram M Shahrooz, Jeremy T Deason, Gokhan Tunc
    Abstract:

    A key factor behind successful performance of outrigger Beam–core Wall connections in hybrid structures is the adequacy of headed studs that are typically used to connect a stud plate, onto which the outrigger Beam is connected through a shear tab, to the Wall. In an effort to better understand cyclic behavior of stud groups under combined action of gravity shear and cyclic diaphragm forces, the research reported was undertaken. Six 1/3-scale subassemblies that involve a portion of the Wall, connection, and outrigger Beam were fabricated and tested. The test results suggest that a design method which closely follows available equations for computing stud capacity results in connections that reach the design loads; however, the mode of failure is stud pullout. This mode of failure does not have any ductility and lacks energy dissipation capabilities. Moreover, the available design equations fail to capture the substantial increase in strength due to Wall boundary element reinforcement around the studs. The...

  • outrigger Beam Wall connections ii subassembly testing and further modeling enhancements
    Journal of Structural Engineering-asce, 2004
    Co-Authors: Bahram M Shahrooz, Gokhan Tunc, Jeremy T Deason
    Abstract:

    Adequate strength of headed studs under cyclic loads is a prerequisite for satisfactory performance of outrigger Beam-core Wall connections that commonly use multiple headed studs. Previous studies have typically not investigated the effects of reinforcement around studs, and have not accounted for the effects of cracking, damage, and yielding of reinforcement on the strength of studs. To remedy these deficiencies, two 1/4-scale subassemblies that contain a cantilever Wall and two outrigger Beams with and without floor diaphragms were subjected to cyclic loading. The Wall reinforcement around the connection was selected according to the anticipated level of cracking and plastic hinge formation. The design methodology followed in this research resulted in connections that could develop and exceed the design forces despite extensive cracking and yielding of Wall reinforcement around the headed studs. The presence of heavily confined Wall boundary elements around headed studs increases the capacity. Simple methods to account for the influence of cracks and strengthening effects of boundary elements were developed. The resulting analytical model was able to accurately establish the expected mode of failure and capacity of outrigger Beam-Wall connections. For the outrigger Beam-Wall connection detail selected, the outrigger Beam was found to transfer the majority of diaphragm forces directly to the core Wall with negligible participation by the floor. Therefore, floor slab-Wall connections can be based on simple details that resist only gravity loads unless the connections are specifically designed to transfer the diaphragm forces to the Wall.

Bahram M Shahrooz - One of the best experts on this subject based on the ideXlab platform.

  • outrigger Beam Wall connections i component testing and development of design model
    Journal of Structural Engineering-asce, 2004
    Co-Authors: Bahram M Shahrooz, Jeremy T Deason, Gokhan Tunc
    Abstract:

    A key factor behind successful performance of outrigger Beam–core Wall connections in hybrid structures is the adequacy of headed studs that are typically used to connect a stud plate, onto which the outrigger Beam is connected through a shear tab, to the Wall. In an effort to better understand cyclic behavior of stud groups under combined action of gravity shear and cyclic diaphragm forces, the research reported was undertaken. Six 1/3-scale subassemblies that involve a portion of the Wall, connection, and outrigger Beam were fabricated and tested. The test results suggest that a design method which closely follows available equations for computing stud capacity results in connections that reach the design loads; however, the mode of failure is stud pullout. This mode of failure does not have any ductility and lacks energy dissipation capabilities. Moreover, the available design equations fail to capture the substantial increase in strength due to Wall boundary element reinforcement around the studs. The...

  • outrigger Beam Wall connections ii subassembly testing and further modeling enhancements
    Journal of Structural Engineering-asce, 2004
    Co-Authors: Bahram M Shahrooz, Gokhan Tunc, Jeremy T Deason
    Abstract:

    Adequate strength of headed studs under cyclic loads is a prerequisite for satisfactory performance of outrigger Beam-core Wall connections that commonly use multiple headed studs. Previous studies have typically not investigated the effects of reinforcement around studs, and have not accounted for the effects of cracking, damage, and yielding of reinforcement on the strength of studs. To remedy these deficiencies, two 1/4-scale subassemblies that contain a cantilever Wall and two outrigger Beams with and without floor diaphragms were subjected to cyclic loading. The Wall reinforcement around the connection was selected according to the anticipated level of cracking and plastic hinge formation. The design methodology followed in this research resulted in connections that could develop and exceed the design forces despite extensive cracking and yielding of Wall reinforcement around the headed studs. The presence of heavily confined Wall boundary elements around headed studs increases the capacity. Simple methods to account for the influence of cracks and strengthening effects of boundary elements were developed. The resulting analytical model was able to accurately establish the expected mode of failure and capacity of outrigger Beam-Wall connections. For the outrigger Beam-Wall connection detail selected, the outrigger Beam was found to transfer the majority of diaphragm forces directly to the core Wall with negligible participation by the floor. Therefore, floor slab-Wall connections can be based on simple details that resist only gravity loads unless the connections are specifically designed to transfer the diaphragm forces to the Wall.

Francisco Javier Molina - One of the best experts on this subject based on the ideXlab platform.

  • pseudodynamic tests on a full scale 3 storey precast concrete building behavior of the mechanical connections and floor diaphragms
    Engineering Structures, 2013
    Co-Authors: Dionysios A Bournas, P Negro, Francisco Javier Molina
    Abstract:

    A full-scale three-storey precast building was tested under seismic conditions at the European Laboratory for Structural Assessment in the framework of the SAFECAST project. The unique research opportunity of testing a complete structural system was exploited to the maximum extent by subjecting the structure to a series of pseudodynamic (PsD) tests and by using four different structural layouts of the same mock-up, while 160 sensors were used to monitor the global and local response of each layout. Dry mechanical connections were adopted to realize the joints between: floor-to-floor, floor-to-Beam, Wall-to-structure; column (and Wall)-to-foundation and Beam-to-column. Particular emphasis was given to the seismic behavior of mechanical Beam–column connections, as well as to the response of floor diaphragms. Thus, the in-plane rigidity of three pretopped diaphragms with or without openings was assessed. In addition, two types of Beam-to-column connections were investigated experimentally, namely hinged Beam–column connections by means of dowel bar and emulative Beam–column joints by means of dry innovative mechanical connections. Therefore, the seismic behavior of floor diaphragms and pinned Beam–column connections in a multi-storey precast building was addressed experimentally. The results demonstrated that the proposed new Beam-to-column connection system is a viable solution toward enhancing the response of precast RC frames subjected to seismic loads, in particular when the system is applied to all joints and quality measures are enforced in the execution of the joints.

  • pseudodynamic tests on a full scale 3 storey precast concrete building behavior of the mechanical connections and floor diaphragms
    Engineering Structures, 2013
    Co-Authors: Dionysios A Bournas, P Negro, Francisco Javier Molina
    Abstract:

    A full-scale three-storey precast building was tested under seismic conditions at the European Laboratory for Structural Assessment in the framework of the SAFECAST project. The unique research opportunity of testing a complete structural system was exploited to the maximum extent by subjecting the structure to a series of pseudodynamic (PsD) tests and by using four different structural layouts of the same mock-up, while 160 sensors were used to monitor the global and local response of each layout. Dry mechanical connections were adopted to realize the joints between: floor-to-floor, floor-to-Beam, Wall-to-structure; column (and Wall)-to-foundation and Beam-to-column. Particular emphasis was given to the seismic behavior of mechanical Beam–column connections, as well as to the response of floor diaphragms. Thus, the in-plane rigidity of three pretopped diaphragms with or without openings was assessed. In addition, two types of Beam-to-column connections were investigated experimentally, namely hinged Beam–column connections by means of dowel bar and emulative Beam–column joints by means of dry innovative mechanical connections. Therefore, the seismic behavior of floor diaphragms and pinned Beam–column connections in a multi-storey precast building was addressed experimentally. The results demonstrated that the proposed new Beam-to-column connection system is a viable solution toward enhancing the response of precast RC frames subjected to seismic loads, in particular when the system is applied to all joints and quality measures are enforced in the execution of the joints.

Dionysios A Bournas - One of the best experts on this subject based on the ideXlab platform.

  • pseudodynamic tests on a full scale 3 storey precast concrete building behavior of the mechanical connections and floor diaphragms
    Engineering Structures, 2013
    Co-Authors: Dionysios A Bournas, P Negro, Francisco Javier Molina
    Abstract:

    A full-scale three-storey precast building was tested under seismic conditions at the European Laboratory for Structural Assessment in the framework of the SAFECAST project. The unique research opportunity of testing a complete structural system was exploited to the maximum extent by subjecting the structure to a series of pseudodynamic (PsD) tests and by using four different structural layouts of the same mock-up, while 160 sensors were used to monitor the global and local response of each layout. Dry mechanical connections were adopted to realize the joints between: floor-to-floor, floor-to-Beam, Wall-to-structure; column (and Wall)-to-foundation and Beam-to-column. Particular emphasis was given to the seismic behavior of mechanical Beam–column connections, as well as to the response of floor diaphragms. Thus, the in-plane rigidity of three pretopped diaphragms with or without openings was assessed. In addition, two types of Beam-to-column connections were investigated experimentally, namely hinged Beam–column connections by means of dowel bar and emulative Beam–column joints by means of dry innovative mechanical connections. Therefore, the seismic behavior of floor diaphragms and pinned Beam–column connections in a multi-storey precast building was addressed experimentally. The results demonstrated that the proposed new Beam-to-column connection system is a viable solution toward enhancing the response of precast RC frames subjected to seismic loads, in particular when the system is applied to all joints and quality measures are enforced in the execution of the joints.

  • pseudodynamic tests on a full scale 3 storey precast concrete building behavior of the mechanical connections and floor diaphragms
    Engineering Structures, 2013
    Co-Authors: Dionysios A Bournas, P Negro, Francisco Javier Molina
    Abstract:

    A full-scale three-storey precast building was tested under seismic conditions at the European Laboratory for Structural Assessment in the framework of the SAFECAST project. The unique research opportunity of testing a complete structural system was exploited to the maximum extent by subjecting the structure to a series of pseudodynamic (PsD) tests and by using four different structural layouts of the same mock-up, while 160 sensors were used to monitor the global and local response of each layout. Dry mechanical connections were adopted to realize the joints between: floor-to-floor, floor-to-Beam, Wall-to-structure; column (and Wall)-to-foundation and Beam-to-column. Particular emphasis was given to the seismic behavior of mechanical Beam–column connections, as well as to the response of floor diaphragms. Thus, the in-plane rigidity of three pretopped diaphragms with or without openings was assessed. In addition, two types of Beam-to-column connections were investigated experimentally, namely hinged Beam–column connections by means of dowel bar and emulative Beam–column joints by means of dry innovative mechanical connections. Therefore, the seismic behavior of floor diaphragms and pinned Beam–column connections in a multi-storey precast building was addressed experimentally. The results demonstrated that the proposed new Beam-to-column connection system is a viable solution toward enhancing the response of precast RC frames subjected to seismic loads, in particular when the system is applied to all joints and quality measures are enforced in the execution of the joints.