Effect of position of steel bracing in L-shape reinforced concrete buildings under lateral loading

Abstract

The level of damage in irregular structures is more compared to regular structures. In this study, L shaped RC buildings are investigated with and without steel bracings in different positions in frames. The response spectrum analysis has been done by using ETABs software. The two cases considered, case I and case II for understanding the effect in inverted V bracing in L shape building. Case II shows the suitable seismic parameters when bracing is used properly. Interstory drift, displacements, base shear, fundamental time period, torsional irregularity ratio and the capacity ratio of the columns are evaluated. It is also noticed that adding the steel bracing decreases the inter-story drift, displacements of the structure effectively. The torsional irregularity ratio of each 12 models are studied carefully. The capacity ratio of the selected columns is studied to understand the performance of the columns while using the steel bracing in the buildings. The steel bracings are effectively used as retrofitting in L shaped buildings if the position of bracings are considered in the frames appropriately. While designing irregular buildings with steel bracings, the torsional effect should be checked.

Respuesta sísmica de edificios de 8 niveles de concreto armado con irregularidad en planta

“…Al diseñar los modelos numéricos, se debe considerar cuidadosamente la deformación lateral y la deriva de las estructuras para evitar una deformación excesiva. En estructuras irregulares, las deformaciones excesivas dañan los elementos estructurales y no estructurales de los edificios [31]. Los mayores desplazamientos laterales obtenidos se presentaron en los casos con DF en comparación con los modelos con DR. Estos desplazamientos están relacionados directamente con las respuestas de los periodos de vibración.…”

“…Se consideró el valor de R = 3.6 para evaluar la irregularidad horizontal torsional extrema para la tipología L. Esta configuración presenta esquinas entrantes y modo oscilatorio de alta frecuencia, que genera una concentración alta de esfuerzos en esquinas entrantes, debido a cambios abruptos en la rigidez y amplificaciones de la torsión. Estos factores provocan fallas en los elementos estructurales [30], [31]. La Fig.…”

Seismic Performance of Reinforced Concrete Buildings with Different Lateral Load

“…Model 2 (X bracing system) is showing better seismic performance out of all the models [27]. The majority of researchers concentrate exclusively on a single system of lateral load resisting structures, typically either shear walls or bracing, when analyzing the response of reinforced concrete buildings [28]- [30]. They do not show much interest in exploring the potential benefits of a combined system that utilizes both shear walls and bracing for a more efficient seismic response.…”

Seismic Behavior of Multi-Storied Rc Building With Re-Entrant Corner

“…Furthermore, these buildings respond differently when placed in different seismic zones. The presence of re-entrant corners in buildings is one of the key weaknesses in the event of an earthquake, causing stress concentration and torsion-related complications [3]. For this reason, it is necessary to investigate re-entrant corner building more and more.…”