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Development of a Phenomenological Model For Beam–to–Column Connections in Moment Resisting Frames Subjected to Seismic Loads

Penubothu Naga Nataraja, Satyanarayana Kumar
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1152583558

Abstract Details

2006, MS, University of Cincinnati, Engineering : Civil Engineering.
Welded Steel Moment Resisting Frames (WSMF) were recommended for multistorey structures in seismic zones without any limitations, prior to the Northridge earthquake of January 17, 1994 based on the premise that these connections are fully rigid and stiff enough to transfer any magnitude of seismic loads. But, the wide range brittle fracture failures of beam–to–column connections in WSMF proved that the idealization of these connections as fully rigid need to be revised and extensive research need to be performed to assess the practical behavior of all types of connections. Researchers pointed out that taking advantage of the semi–rigid connection behavior is a very practical approach to define the response of most of types of connections available in literature. Numerous researchers throughout the world have been working on various semi–rigid connections to predict their static and cyclic behavior using various modeling techniques. The phenomenological modeling technique is relatively novel in its application to beam–to–column connections. Phenomenological models are based on some characteristic curves of the experimental behavior; using pre–determined rules,they are capable of simulating the whole experimental response. So far no phenomenological model is available in the literature to predict the seismic behavior of beam–to–column connections. Hence a phenomenological model is proposed as part of this study. The proposed phenomenological model is based on the model proposed by Noé et al., (1996). In the present model, base cycle formulation rules are modified. New envelope curves are identified and incorporated in the model for addressing the decreasing loading cycles observed as part of seismic loads. New hysteresis rules are proposed to address all three types of loading commonly used by the researchers in the experimental studies of the beam–to–column connections. In order to address the lowcycle fatigue behavior commonly observed in the beam–to–column connections, two degradation functions are proposed. The model is validated against nine test cases from different types of connections with different commonly observed behaviors of connections. The results of the validation study indicate that the error range is within acceptable limits. Hence, from this study, it is concluded that the model is capable to address common seismic behavior of any type of moment resisting connections. The only limitation of the proposed model is its inability to identify the failure behavior of the connection. The essential purpose of conducting the theoretical studies on semi–rigid connections subjected to seismic loading is to use the model&acutes; hysteresis relationships in evaluating the seismic response of frames. Hence, frame analysis is conducted as part of the study. Three scaled frames are subjected to El Centro (1940) earthquake record and Northridge (1994) earthquake record with connection behavior modeled as elasticperfectly plastic, V—14, and V—15 connections as experimented by Pekcan et al. (1995). Frame analysis results indicated that large lateral deformations are produced in the frames with V—14 and Vmndash;15 connections. It is also observed that the moments produced in the members of the frames with V—14 and V—15 connections are more than the frames modeled with elastic–perfectly plastic connections. Hence, traditional assumption that the beam–to–column connection&acutes; behavior as elastic–perfectly plastic, is underestimating the moments produced in the members as well as lateral deformations. As a consequence, more realistic beam–to–column connection behavior shall be assessed and used in the frame analysis.
Gian Rassati (Advisor)
Anant Kukreti (Other)
James Swanson (Other)
257 p.
Engineering, Civil
Connections; Moment Resisting Frames; Phenomenological Model, Cyclic; Loads; Seismic loads

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Citations

  • Penubothu Naga Nataraja, S. K. (2006). Development of a Phenomenological Model For Beam–to–Column Connections in Moment Resisting Frames Subjected to Seismic Loads [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1152583558

    APA Style (7th edition)

  • Penubothu Naga Nataraja, Satyanarayana Kumar. Development of a Phenomenological Model For Beam–to–Column Connections in Moment Resisting Frames Subjected to Seismic Loads. 2006. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1152583558.

    MLA Style (8th edition)

  • Penubothu Naga Nataraja, Satyanarayana Kumar. "Development of a Phenomenological Model For Beam–to–Column Connections in Moment Resisting Frames Subjected to Seismic Loads." Master's thesis, University of Cincinnati, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1152583558

    Chicago Manual of Style (17th edition)

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This open access ETD is published by University of Cincinnati and OhioLINK.