A Study by Comparison on Vertical Geometric Irregular Frame-Wall Structure Under Lateral Loading

Abstract

Recent earth quakes in many parts of the globe have revealed the issue regarding the vulnerability of existing buildings. The exiting building structures which were designed and constructed according to earlier code provisions do not satisfy requirement of current seismic code and design practice. Many reinforced concrete buildings in urban regions lying in active seismic zone may suffer moderate to severe damages during future ground motion therefore it is essential to mitigate unacceptable hazards to property and life of occupant. Building may be considered as asymmetric in plan or in elevation based on the distribution of mass and stiffness along each storey throughout the height of the buildings. Most of the hilly regions of India are highly seismic. Buildings on hill slopes differ in a way from other buildings. The various floors of such building steps back towards the hill slope and at the same time buildings may have setbacks also. Due to varied configurations of these buildings become highly irregular and asymmetric. Buildings situated in hilly areas are much more vulnerable to seismic environment. The performance of structures during past earthquakes has shown that asymmetric-plan buildings are especially vulnerable to earthquake damage. Therefore, numerous investigations in the past have investigated the earthquake behavior of asymmetric-plan buildings. In the study, 3D analytical model Ascending and Descending buildings have been generated and analyzed using structural analysis tool "STAAD. Pro." To study the effect of varying height of columns in top storey due to Architectural purpose. The analytical model of the building includes all important components that influence the mass, strength, stiffness, and deformability of the structure. The deflections at each storey level has been compared by performing response spectrum method has been performed to determine capacity, demand and performance level of the considered building models.