Experimental studies of the bending resistance of composite beams with loop connections between precast parts

Abstract

Loop connections for precast concrete structures have various advantages in terms of ease of setting, high flexibility and strength. Despite the advantages, the widespread use of the loop connection in the construction industry is limited due to the lack of a design methodology in performance standards. Several available design techniques outlined in various studies are empirical upper bound solutions based on experimental observations and results that do not take into account all the factors that affect loop connection behavior and strength. However, the influence of the main parameters of the loop connection cannot be ignored for detailed evaluation and decision making when designing these elements. In this regard, this article presents the results of experimental studies of prefabricated monolithic beams with loop connections on self-stressing concrete and concrete on Portland cement. The distinctive features that affect the load carrying ability and the fracture behavior of such elements when using expansive concrete and concrete on Portland cement as a monolithic connection are revealed.