Reinforced concrete multi storey buildings are subjected to severe earthquakes. It was found that the main reason for failure of RC building is irregularity in its dimension and its lateral force resisting system. In this paper an analytical study is made to find response of different regular and vertical irregular structures such as mass, stiffness and geometry irregularity located in moderate zone III. Analysis has been made by taking 10 and 20 storey building by static and dynamic methods using ETABS 2013 and IS code 1893-2002 (part1). Behavior of structures will be found by comparing responses in the form of storey displacement, story drift and base shear for regular and vertical irregular structures. Different types of analysis methods such as equivalent static method, response spectrum and time history method are adopted. One is of regular structure and remaining are vertical irregular structural models. This paper shows that behavior vertical irregular structures as compared to regular structure.

Water tanks play an important role in water supply networks, during and post-earthquake for vital reasons such as to extinguish fire, drinking purpose etc. In general there are three kinds of water tanks-tanks resting on ground, underground tanks and elevated tanks. Here we are studying only about the elevated rectangular tanks. This paper presents the seismic analysis of an elevated rectangular water tank with mid frame staging and is compared by changing the seismic zone as per IS: 1893-2002 (Part-2) and wind speeds for different soil conditions such as hard, medium and soft soil. The elevated rectangular tank has been modelled by using the software ETABS. The water tank is also optimized by N Pandian method to give the optimum and economical design of water tank.

Earthquake is a very important aspect to be considered while designing structures. Lot of work has been reported by many researchers who worked to study the effect of structures with irregular plan. This paper presents effects of plan and shape configuration on irregular shaped structures. Buildings with irregular geometry respond differently against seismic action. Plan geometry is the parameter which decides its performance against different loading conditions. The effect of irregularity (plan) on structure have been carried out by using structural analysis software ETABS for three different types of soil considering the effect of soil structure interaction. There are several factors which affect the behaviour of building from which storey drift and lateral displacement play an important role in understanding the behaviour of structure. Results are expressed in form of graphs and bar charts. Based on these conclusions have been presented.

Progressive collapse is a catastrophic structural event that occurs when failure of one or more structural member in the structure initiates a chain reaction resulting in partial or total collapse of the structure.To study the behavior of RC structure under the influence of seismic actions a load bearing vertical element like wall or column is removed and evaluated using nonlinear static pushdown analysis. For this a 3-D model is stimulated and a nonlinear static analysis is performed by removing a critical column at desired location in the plan prescribed by General Service Administration (GSA) guidelines. The importance of beams during a column loss is evaluated in the present study to resist possible progressive collapse.