Resumen de Cyclic performance of emulative precast beam to column con-nection with corbel using dowel bar
The objective of this study is to examine the seismic performanceof exterior and interior typesof an emulative precast beam to column connection, constructed withgrouted steel dowel bar and cast-in-situconcrete under quasi-static reversed cyclic loading. Thedowel bar connection between the precast structural elements is achievedby insertingthe dowel bar into the column corbel's holes and the precast portion of the beam. To secure the dowel bar's anchorage,these holes are packed with non-shrinkage grout and then cast-in-situ concreting is done in the joint core and the entire upper segment of the precast beam.Inthe past, particularly after anearthquake in the Emilia-Romagna regionof Italy in May 2012(Ercolino, Magliulo, & Manfredi, 2016), witnessed damage to precast reinforced concrete structures was more likely to occur in the precast beam-column joint section. Hence, it’s essential to improve theperformance of the beam-column joint to withstand all possible lateral load combinations, which are to be included in the design and detailing of the precast structural components.This studyanalyzedan eight-storyRC frame building for earthquake loading using Staad.Pro soft-ware. The exterior and interior types of proposed beam-column connections were designed and detailed using thedesign forces and moments computed bythe Staad.Pro analysis, in accordance with the Indian standard codes (IS456, 2000), (IS 1893,2016)and (IS 13920,2016). The beam-column joint behaviorunder quasi-static cyclic loading was studied using one-third scaled-down test specimens, i.e., monolithic (MBC-EJ & MBC-IJ) and emulative beam-column(EBC-EJ & EBC-IJ) exterior and interior joints. In that proposed emulative connection, the structural continuity and compatibility between the precast elements were achieved through the corbel with the dowel bar and cast-in-situ concreting. The test specimen’s ultimate and yield load carrying capacity, energy dissipation capacity, stiffness degradation, and ductility pa-rameters were determined based on the obtained load-displacementhysteresis relationship.Based on the findings, the precast exterior joint specimens (EBC-EJ) were found to be 14.36% more ductile and 13.23% more energy dissipative than monolithic exterior joint specimens (MBC-EJ). Similarly, precast interior joint specimens (EBC-IJ) outperformed mono-lithic interior joint specimens (MBC-IJ) by 6.27% more ductility and 16.86% more energy dissipation. Therefore, the experimental results confirmed that using grouted dowel barsand wet concretingin the joint area enhances rigidity and structural continuity, as well as improves the ultimate strength of precast connections to a level that closely resembles typical monolithic beam-column joints.
