In the ever-evolving world of construction, innovation in structural connections can significantly impact both time and cost efficiency, as well as safety. A recent study published in the Brazilian Journal of Structural and Material Engineering (Revista IBRACON de Estruturas e Materiais) by Ygor Moriel Neuberger, a researcher affiliated with a prominent institution, sheds light on the behavior of bolted beam-to-column connections under cyclic loading, offering promising insights for the energy sector and beyond.
Precast concrete systems have long been favored for their speed and efficiency in construction. However, the connections between elements are crucial for ensuring structural integrity and stability. Neuberger’s study focuses on semi-rigid bolted beam-to-column connections, which are not only quicker to install on-site but also offer enhanced energy dissipation under seismic loading compared to traditional cast-in-place connections.
The research developed and validated a nonlinear numerical model using DIANA® software to simulate the behavior of these connections under both monotonic and cyclic loading. “The model was calibrated using experimental data, and it showed a remarkable accuracy, with a maximum error of just 3% in predicting ultimate strength,” Neuberger explains. The model also accurately represented the stiffness, cracking pattern, and global behavior of the connection, with a slightly higher error margin of 30% in energy dissipation capacity.
One of the key aspects of the study was the development of an analytical model to estimate the secant stiffness of the connection. The comparison between cyclic and monotonic loading revealed low stiffness degradation up to the yielding of the bolts, a finding that could have significant implications for the design and construction of structures in seismic zones.
The study also conducted a parametric analysis to assess the influence of various factors, such as concrete strength, bolt diameter, and bolt steel grade, on the connection’s performance. The results showed that the proposed analytical model yielded a stiffness ratio (numerical-to-analytical) of 1.00 with a coefficient of variation of 4.54%, confirming its applicability for estimating the stiffness of bolted connections.
So, what does this mean for the future of construction and the energy sector? The enhanced understanding of bolted beam-to-column connections could lead to more efficient and safer designs, particularly in areas prone to seismic activity. This could translate into significant cost savings and improved safety standards for energy infrastructure, such as power plants and renewable energy facilities.
As Neuberger puts it, “This research opens up new possibilities for optimizing the design of precast concrete structures, particularly in seismic regions. It’s an exciting time for the field, and I’m eager to see how these findings will shape future developments.”
In conclusion, Neuberger’s study represents a significant step forward in the understanding of bolted beam-to-column connections. By providing a robust numerical and analytical modeling framework, the research paves the way for more efficient, safe, and cost-effective construction practices, with far-reaching implications for the energy sector and beyond.