Pushover Analysis of Setback Building
Pushover analysis is a nonlinear static analysis used mainly for seismic effect on building. At the time of Earthquake or seismic vibration maximum framed and R/C building damaged and their response depends on the distribution of mass, stiffness, and strength. This effects is in one or both direction in horizontal and vertical. In multi-storey framed buildings, damage from earthquake ground motion generally initiates at locations of structural weaknesses portion like beam and column joint present in the lateral load. In this case generally irregular multi storey buildings are setback at one side. Reason behind this damage is different distribution of mass of the building. In some cases, these weaknesses may be created by discontinuities in stiffness, strength or mass between adjacent storeys. It also depends on the height of the building , this sudden variation cause many disastrous effect for the people and environment.
There are many examples of failure of buildings in past earthquakes due to such vertical discontinuities (like BHUJ Earthquake 2000 in Gujrat ). A common type of vertical geometrical irregularity in building structures arises from reduction of the lateral dimension of the building at specific levels of the elevation. This building category is known as the setback building.
Keywords - Setback Building; Pushover Analysis; Irregularity; Target Displacement; Lateral Load Profile; Time History Analysis.