Tall building: effect of opening on torsional rigidity of a 3-D core wall

• Main Author: Huang, Xia
• Other Authors: Fan, Sau Cheong
• Format: Final Year Project
• Language: English
• Published: 2014
• Subjects: DRNTU::Engineering
• Online Access: http://hdl.handle.net/10356/61076
• Institution: Nanyang Technological University

Nowadays, high rise reinforced concrete (RC) buildings are increasingly popular due to its fast construction and flexible planning. As building height increases, importance of lateral force action rises exponentially. The effects of sway and ground shaking of buildings caused by wind load and earthquakes would affect durability and service performance of the structures. Since lateral sway governs design when buildings are designed beyond a certain height, a good understanding on behaviours of structures under both static and seismic effects is essential for building design. A validation of a ETABS model is done by comparing the overall trend of lateral maximum displacement and drift ratio with the results from previous study to ensure the accuracy of the results generated by ETABS. Even though the structural detail is different, the general behaviour is supposed to be the same. Once the validation of model is done, modification of the model for the use of investigating effect of openings on RC core wall can proceed. The process of the project is classified into 3 steps. Firstly, structural system was defined for the model and analysis was carried out. Secondly, comparisons among results of all the load combinations were conducted. The worst load combination was chosen as it represented the worst situation the building might experience. This is required for further studies and a conservative design purpose. Lastly, different sets of variable parameters, such as spandrel beam depth and front wall thickness, will be adjusted using the chosen worst case scenario. It is observed that lateral displacement can be control by enlarging opening size on core wall under wind load, but opening size have insignificant effect on its structural behaviour under seismic load. For both wind condition and seismic condition, thickening wall is a good way to control the structural behaviour of tall core wall.