International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 12 | Dec 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1562 Comparative Study on Seismic and Wind Performance of Multi-Storeyed Building with Plan and Vertical Irregularities - A Review Bilal Ahmad Lone 1 , Jagdish Chand 2 1 PG Student, UIE-Civil Engineering, Chandigarh University, Mohali, Punjab, India. 2 Associate Professor, UIE -Civil Engineering, Chandigarh University, Mohali, Punjab, India. ------------------------------------------------------------------------***----------------------------------------------------------------------- Abstract: It is a big challenge that tall buildings must withstand the various forces acting from different directions and aspects such as seismic and wind forces. While designing tall structures it is mandatory to deeply understand the seismic and wind behavior of multi-story buildings. Present study deals with the literature review on the behavior of the seismic and wind performance of regular and irregular structures by changing height and terrain category on different structures. The modeling and analysis of the previous structures were studied in perceptive of their shapes and zone-V. The buildings are modeled and analyzed by using ETABS software. Seismic analysis as per IS 1893-2016 and wind analysis as per IS 875 Part 3 was studied. Different types of parameters such as storey drift, storey displacement, base shear, overturning moment, acceleration and time period were studied. It has been found from the previous study that difference between the regular and irregular models gave variation in the displacement, drift due to the lateral forces acting on both types of buildings. Keywords: Multi-storey building, seismic analysis, storey displacements, storey drift, overturning moment. Introduction Wind load and seismic load plays an important role while designing tall structures because remaining all other loads have variations in a very small margin, the present study deals with the seismic and wind load effect of a regular and irregular multi-story building. If a building is designed with high resistance towards wind the structure will become more expensive. To keep the proper balance between the economy and safety it is compulsory to deeply understand the relation between the behavior of buildings subjected to wind force acting on the buildings. The wind has two important components, static and dynamic. The dynamic character of wind contains mean wind velocity and varying gust velocity. It is important to consider while designing high rise buildings the resistance against wind are not too much, high rise buildings are weak in resistance against wind. Tall structures are the major projects during designing they need vailed logistics and should be well managed. Proper arrangement of structural components and the shape of structure minimize the lateral displacement and decrease the overall cost of structures. The standard method for the design of tall buildings in the past was in the form of rectangular shape, mostly but nowadays much more complex geometries are in practice. Tall structures consider four main important factors such as stiffness, ductility, regular and simple structure, and ample lateral strength. Regular geometry structures in plan and elevation possess less damage than the irregular configuration. According to IS1893-2016, a building should be irregular when it is not symmetrical and have a discontinuity in geometry, mass, or load, these irregularities create problems in action of forces and stress distribution. Structure analysis plays a vital role to determine the behavior of the structures which are subjected to some action. Wind, waves, traffic, earthquake, and blasts are dynamic loads, if dynamic loads are applied on a structure, performance of the structure get decreased under severe seismic loading due to structure symmetry, due to asymmetry of structure member forces increased and ultimately structure collapsed Concept of regular and irregular configuration The latest earthquake codes differentiates regular and irregular structures in terms of shape and size of the structure, assigning of the structural and non-structural components within the structure, and mass distribution of the structure. Plan Irregularity A symmetric or plan irregular structures are both translational and torsional and results in stiffness and mass eccentricity in the structure. Because of uncertainty in the evaluation of the center of mass and stiffness, inaccuracy in the dimensions of structural elements, asymmetry may exist in a normal symmetric structure. Vertical irregularity It is caused in the building due to the unbalance distribution of mass and stiffness along the elevation. Mass irregularity and stiffness irregularity are due to abrupt change in mass and stiffness in the vertical direction of floors