Analysis of Wind Load on High-Rise Residential Building According to BNBC

Abstract

The primary objective of the study was to find the displacement and drift of the R.C.C. frame with shear wall with respect to different wind speed for a high-rise building. To achieve this goal a plan of 10 storied high-rise building has been considered, which will have its geometrical location in Barisal. Barisal is a district of Bangladesh which is under seismic zone 2 and exposer B. The maximum wind speed of this area is 256 km/h. The study was conducted with the intention of defining displacement and drift changes on a R.C.C. frame tall building under the control of lateral movement. All loads and loading conditions were selected following the Bangladesh National Building Code (BNBC- 2006) to model and analyse the building. The analysis has been done by using computer designing software ETABS for the study of lateral movement due to lateral loads as well as for overall impact on the building. All the results were provided according to story response plot graphs and compared to each other on the basis on structural system. Displacement and inner-story drift were considered as lateral movement. Shear wall was included to have more stiffer frame. Shear wall can resist the lateral load and produce a reduction of lateral deflection. Loads easily distributed in members the connecting point of shear wall to have a large reduction in drift. As the study is mainly based on wind load, 150-260 km/h wind speed has been considered to study. In Bangladesh the lowest wind speed is 150 km/h which is in Agarpota, Dahagram etc. places. The study started from these wind speed and took 12 wind variation samples. The samples was started with 150 km/h and finished with 260 km/h which was the largest wind speed value in Bangladesh. After the analysis the maximum displacement was found 12.9 inches at 260 km/h wind speed and drift was found 0.0191 at story 10. The lowest displacement and drift value were respectively 8.8 inches and 0.0021 at wind speed 150 km/h at story 1. It is recommended that shear wall should also be used in different location of the structure so that it can perform better under the occurrence of story drift. The contributing stiffness from non-structural element should also be considered for the limit state of wind drift, earthquake drift serviceability. Future studies should be done in this sector for better assessment for the effectiveness and stability for different wind speed on plane geometry.