Hysteretic Rotation Model HRM4 for CFRP Strengthened Joints


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Title: Hysteretic Rotation Model HRM4 for CFRP Strengthened Joints

Author(s): Pedro F. Silva

Publication: Special Publication

Volume: 258


Appears on pages(s): 105-116

Keywords: beam-column joints, fiber reinforced polymer composites, hysteretic models, joint damage, joint flexibility

Date: 12/1/2008

A simple hysteretic model is proposed to define the cyclic response of reinforced concrete (RC) beam to column joints retrofitted with (carbon fiber reinforced polymer (CFRP) composites. This model includes the option to consider strength degradation resulting from damage within the joint region. The model consists of two nonlinear springs connected in series and positioned at the ends of linear elastic beam elements. The hysteretic models representing these springs were empirically derived from beam to column joint specimens retrofitted with CFRP composites and are capable of describing the hysteretic characteristics of reinforced concrete members in the column as well as in the joint hinge region. The model was subsequently used to evaluate the response of two test units that were retrofitted with CFRP composites at different damage levels. Key experimental results along with the proposed models and simulation results are presented and discussed in this paper. The analytical results were able to reproduce reasonably well the experimental data.