Assessment of Collapse Approach Based on Pre-established Engineering Demand Parameters (EDP)s Limits

摘要

Traditionally, collapse potential was estimated by using non-deteriorating systems in order to predict the Engineering Demand Parameters (EDPs) and assigning judgment limits for these parameters. Recently, the deteriorating systems have been used for estimation of collapse but still based on pre-established EDPs limits. However, EDPs become very sensitive when the system is very near to collapse, and small disturbance of the input creates great variations in the response. In the earthquake engineering, the concept of global collapse denotes the lack of ability of a structural system for bearing the gravity loads in exposing the seismic excitation. In the earthquake engineering the concept of collapse denotes the lack of ability of a structural system or a part of it, for bearing the gravity load-carrying capacity under the seismic excitation. Collapse can be local or global; the local collapse can for example happen when a vertical load-carrying component is not successful in compression or when shear transfer is missed between the vertical and horizontal components (for instance shear failure between a column and a flat slab). But global collapse may have several reasons. The transference of a primary local failure from each component to another one can lead to progressive or cascading collapse. In this sturdy, try to investigate the different parts of collapse assessment methods to understand and quantify the effects and to develop nonlinear deteriorating component models which could duplicate the experimental results. P-Δ, degrading hysteretic model, and expected spectral shape effect on collapse methods assess the structural collapse capacity by nonlinear dynamic analysis occurs in case of ground motions selection and scaling for the analysis.