Cyclic Behaviour of Prefabricated High-Strength Concrete Composite Beam-to-Column Joints

摘要

Prefabricated high-strength concrete composite beam-to-column joints were widely used in civilengineering. Six full scale cruciform type test samples with different parameters (thickness of steeljoint plate and reinforcement ratio of column) were constructed and tested under cyclic lateralloading to study on the hysteretic behavior. The load-displacement curves, failure mode, stiffnessdegradation and energy dissipation capacity were presented. It was found that the strength andstiffness are less influenced by the steel joint plate thickness, but more influenced by thereinforcement ratio of the column. Failure modes were transformed from brittle shear in the columndiagonals to a ductile one in the beam region, more ductile behavior and slower stiffnessdegradation were observed for the specimens strengthened by CFRP materials. The findings fromthe analysis were of guiding significance to the design and construction of the composite joint.