Numerical Analysis of Shear-Off Failure of Keyed Epoxied Joints in Precast Concrete Segmental Bridges

Effect of specimen thickness and coarse aggregate size on shear strength of single‐keyed dry joints in precast concrete segmental bridges

“…This observation is consistent with the findings of Ref. . Meanwhile, there were an ascending and a descending branch in the curves of D25 specimens.…”

“…Nevertheless, dry joints in precast concrete segmental bridges (PCSBs) cracked or failed due to complex stresses, which largely affects the overall structural behavior of PCSBs. It is believed that the most significant parameters affecting shear behavior of the dry joint are prestressing level, shape of the key, concrete compression strength, concrete tensile strength, surface preparation, and contact area of the joint …”

“…Another numerical investigation has been found that tensile strength of concrete had a significant effect on shear capacity of the joint and the displacement at ultimate load. Increasing tensile strength of concrete could increase shear capacity of the joints …”

“…It pointed out that AASHTO was conservative to estimate shear strength of single keyed epoxied joints since it neglected the contribution of the epoxy and underestimated the strength of the key itself . Shamass et al established numerical analysis to investigate shear‐off failure of dry joints and epoxied joints respectively . It found that shear capacity of dry joints predicted by the AASHTO provision diverges from that predicted by numerical analysis at high confining pressure, because the contribution of friction in the total shear capacity decreased with an increase in confining pressure .…”

“…Another investigation has been found that the initial stiffness of epoxied joints did not change as confining stress increased. However, the vertical displacement at the peak load and ultimate shear strength of epoxied joints increased as confining stress increased …”