Evaluation of Interstory Drift Using Shotcrete and Reinforced Concrete Walls in Confined Masonry Buildings with Hollow Clay Brick Units

Gonzales P.O.; Flores A.C.; Espinoza V.T. · International Conference on Civil, Structural and Transportation Engineering (2026) · DOI: 10.11159/iccste26.151

Resumen

–This study evaluates the seismic behavior of a three-story multi-family dwelling constructed with confined masonry and hollow brick, located in Metropolitan Lima, where many buildings of this type exhibit insufficient lateral stiffness and interstory drifts exceeding the Peruvian Standard E.030. The structure was modeled in ETABS considering the actual configuration of load-bearing walls, confinement elements, gravity loads, and regulatory seismic parameters, in order to determine if shotcrete cladding, combined with two reinforced concrete walls, reduces interstory drifts and achieves compliance with the standard. In the original condition, drifts in the X direction reach 0.457%, 0.611%, and 0.533% on levels 1, 2, and 3, respectively, exceeding the 0.5% limit, while drifts in the Y direction remain within permitted limits. Applying shotcrete to all walls aligned with the X-axis reduces drifts to 0.397%, 0.548%, and 0.489%, representing decreases of approximately 8% to 13% compared to the original model, although the second level still does not meet the criterion. Subsequently, with the addition of two concrete walls on either side of the center of mass with reference to the X-axis, drifts decrease to 0.342%, 0.495%, and 0.459%, that is, reductions of approximately 14% to 25% compared to the initial condition, with all levels below 0.5%. These results show that shotcrete contributes to improving the lateral stiffness of the hollow brick walls, but it is the combination with the two new reinforced concrete walls that guarantees full compliance with Standard E.030 and a more adequate overall seismic performance of the building.

Instituciones: Universidad Peruana de Ciencias Aplicadas