Takuya OBOKATA

Study on Reinforcing Steel Short Columns with CFRP

Takeshi MIYASHITA

We are investigating the usefulness of the CFRP bonding method as a reinforcement for the local buckling of small cross-sectional members, such as the lower chord members at the end of the truss and diagonal members in the span of the highway steel truss bridges, during earthquakes. This method has more advantages than traditional methods. We used a scaled-down minimum plate thickness cross-section, commonly used in the tension members of the upper truss bridges, as the basic element and set the test specimen size while focusing on the final state of each steel member. We set test specimen cases as parameters such as the lamination method, construction surface, and number of construction sheets for CFRP sheets and conducted monotonic compression loading tests on H-shaped section short columns. We confirmed the possibility of formulating the reinforcement effect of the CFRP bonding method against the maximum strength and are considering the development of a reinforcement manual for this method.
The main goal of our study is to evaluate the effectiveness of the CFRP bonding method as a reinforcement technique for small cross-sectional members in highway steel truss bridges during seismic events. This method offers many advantages over traditional methods. We used scaled-down cross-sections that are typically used in tension members of upper truss bridges and varied the test specimen size based on the final state of each steel member. We also varied the lamination method, construction surface, and number of construction sheets for CFRP sheets and conducted monotonic compression loading tests on H-shaped section short columns. We confirmed that it is possible to formalize the reinforcement effect of the CFRP bonding method against the maximum strength and are considering the development of a reinforcement manual for this method.