Study on cyclic behavior of concrete column steel beam connections

Composite structures are the alternative technologies that have been considered with the recent advancements in the field of engineering. Different types of structural composites and material composites have undergone researches. The use of the steel-concrete composite structure has been of higher importance as they offer durability, safe, cost-effective, and seismic resistant properties. Modern researches have been challenged each time with the seismic effect on the building. The recent challenge that has been faced by the researcher is the connection that has to be made to make two different members act monolithically. Connection design has been one of the major challenges that have been understood by the researcher and have undergone much researches. This research aims in finding the cyclic behavior study of the composite connection due to changes in shape and sizes of anchorage specimens and their performance as part of extended endplate connection for Concrete column and Steel beam connections. The steel beam and concrete column is connected by extended end plate connection. The bolts are anchored in different types of anchorage techniques such as; Double end-plate full length anchorage, Double end-plate mid length anchorage, Mid length anchorage without support at end, 90 degrees bend without support at end, 90 degrees bend with support at end. The cyclic loading was applied as per the guidelines of FEMA 350 loading history. The study focuses on the stiffness, energy dissipation capacity, and overall performance of five distinct connection configurations. This study has shown that specimen CA4 offered approximately 5.5 times higher moment compared and nearly 2 times the rotation compared with the least moment and least rotation offered among the other specimens respectively. Experimental investigations reveal that CA4 exhibits the highest energy dissipation capacity (1.520 kNm rad), 1.23 times greater than CA5, highlighting the effectiveness of end support in enhancing energy dissipation. Conversely, CA5 demonstrates the highest secant stiffness (1760.5 kNm/rad), indicating superior rigidity and minimal deformation under load, making it ideal for applications requiring strict deflection control. The findings emphasize the importance of anchorage design and bond behavior in determining the cyclic performance of composite connections, with implications for improving structural resilience in seismic applications.