Role of coupler in structural behavior of RC elements

Abstract

This research article presents a detailed review on the influence of couplers on the structural behavior of RC elements. There are different types of couplers such as threaded, bolted, grouted, interlocking and crimped etc. The performance of each coupler varies with respect to the corresponding configuration. The usage of couplers in construction reduces significant amount of conventional lap length and saves time and materials. The standard recommended tests such as tensile test, slip test, cyclic test and fatigue test ensures the quality of coupler in transmitting the forces with proper rebar yielding failure. The stress transfer mechanism of rebar with the coupler ensures the continuity of reinforcement which is dissimilar to the conventional lap splice. The size of the couplers is varying with respect to the diameter of bar and its type. The diameter of couplers is always higher than the actual diameter of rebar. The placement and profile of coupler play crucial role on the structural behavior of RC elements. Many studies have been conducted using different types of couplers at different locations in structural elements and examined under static and dynamic loads. This article presents a critical review on the structural behavior of RC elements with different type of coupler and also a pilot study on the mechanical properties of the hybrid coupler under static and cyclic loading is discussed.