Fema 356 pushover analysis pdf

This paper comprehensively evaluates the Modal Pushover Analysis (MPA) procedure against the "exact" nonlinear response history analysis (RHA) and investigates the accuracy of seismic demands determined by pushover analysis using FEMA-356 force distributions; the MPA procedure in this paper contains several improvements over the original version presented in Chopra and Goel (2002). Instructional Material Complementing FEMA 451, Design Examples Advanced Analysis 15-5b - 4 Why Pushover Analysis? •Nonlinear static pushover analysis may provide reasonable estimates of location of inelastic behavior. •Pushover analysis alone is not capable of providing estimates of maximum deformation. Additional analysis must be performed The objective of this investigation is to evaluate the FEMA-356 Nonlinear Static Procedure (NSP) and a recently developed Modal Pushover Analysis (MPA) procedure using recorded motions of two steel buildings that were damaged during the 1994 Northridge earthquake. FEMA 356 utilizes a displacement modification procedure (Coefficient Method) in which several empirically derived factors are used to modify the response of a single-degree-of- freedom model of the structure assuming that it remains elastic. The alternative Capacity-Spectrum Method of ATC-40 is actually a form of equivalent linearization. The objective of this investigation is to evaluate the FEMA-356 Nonlinear Static Procedure (NSP), the Modal Pushover Analysis (MPA) procedure, and the "Sum-Difference" procedure using recorded motions of a building that was damaged during the 1994 Northridge earthquake. For this purpose, displacements Typically, the FEMA 356 model reasonably predicts the side strength of a column, but underestimates the shear strength of the beam column joint. The initial stiffness and deformation predicted in both yield and ultimate is conservative for columns. Pushover analysis involves certain approximations and simplifications that some amount of variation is always expected to exist in seismic demand prediction of pushover analysis. In literature, some improved pushover procedures have been proposed to overcome the certain limitations of traditional pushover procedures. history estimates and to other pushover procedures. One set of lateral load patterns was based on recommendations in FEMA-356 while the second methodology considered in the comparative study is the modal pushover analysis (MPA) of Chopra and Goel [2]. A brief overview is presented of the different NSP methodologies used in the study. The "Nonlinear Analysis" feature in ProtaStructure enables the user to perform nonlinear analysis methods such as Pushover Analysis and Time-History Analysis. In this document, target displacement calculation for nonlinear pushover analysis according to FEMA 356 3.3.3.3.2 will be explained in detail and verified with the hand calculation. Nonlinear Pushover Analysis of Steel Frame Structure Dahal, Purna P., Graduate Student FEMA-356 and ATC-40. Modeling: Figure 1- Steel frame Structure (A992Fy50) effects of ground motion selection on seismic response of buildings a thesis submitted to the graduate school of natural and applied sciences fFEMA 356 This code was prepared under a cooperative agreement between the Federal Emergency Management Agency and the American Society of Civil Engineers in November 2000. It was developed as a response to major earthquakes which have caused devastation in highly popula