What is Pushover Analysis?
The analysis pushover (or thrust), is a method of non linear static analysis of the structures. This analysis is used to calculate the effects of the seismic actions of dissipative systems which have an elastic-plastic behavior.
This is a highly innovative approach as it allows performance analysis of buildings: by constructing the pushover curve of a structure (performance curve on a force-displacement or acceleration-displacement plane) it is possible to immediately identify the value of the base shear corresponding to the various limit states and above all how, when and how much the structure under examination will be damaged .
What is Pushover nonlinear static analysis?
Pushover analysis consists of a lateral load that pushes the structure in incremental steps; calculating the state of equilibrium in each of them, as well as the corresponding internal forces and the displacements of the nodes, it consequently describes the elastic and plastic behavior of each structural element and its non-linear hinges.
What does the NTC 2018 foresee on side loads?
According to the NTC 2018 regulation, a corresponding side load to an acceleration proportional to the fundamental modal form in the direction of the vibration.
In Our Studio "Seismic improvement of a reinforced concrete structure of the 60s with ISAAC technology according to NTC 2018", in which we apply the seismic protection device I-Pro 1, the first prototype of ISAAC, we have considered the 3rd modal form, which has a mass participation of 87% (the minimum required by the regulations is 75%). The incremental load application was performed by memorizing at least 40 steps, having set a maximum displacement control of the last upper floor instead of a force one, since it is the total lateral resistance that must be determined and it is assumed to obtain a capacity curve with a final decrease in the bearable lateral load.
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