pushoveranalyysin

Pushover analysis is a static nonlinear structural analysis method used to estimate the seismic performance of a structure. It involves applying a gradually increasing lateral force to the structure until a predetermined displacement is reached or the structure collapses. The analysis generates a capacity curve, which plots the base shear (total lateral force at the base) against the roof displacement. This curve represents the structure's resistance to lateral loading and its deformation characteristics.

The procedure typically begins with a linear elastic analysis to determine the initial stiffness and stress distribution. Then, nonlinear behavior is introduced by defining plastic hinges or material nonlinearities at critical locations within the structure, such as beam-column joints, beams, or columns. The lateral forces are usually applied in a pattern that approximates the expected distribution of inertial forces during an earthquake, often based on the first mode of vibration.

The resulting capacity curve provides valuable insights into the structure's strength, stiffness, and ductility. It can be used to estimate the structure's likely performance under different levels of seismic shaking by comparing the capacity curve to demand spectra, which represent the expected seismic forces for a given site. This comparison allows engineers to assess whether the structure can withstand anticipated earthquake loads and identify potential failure mechanisms and areas of weakness. Pushover analysis is a simplified yet effective tool for performance-based seismic design and assessment.