PUSHOVER ANALYSIS OF MASONRY INFILLED REINFORCED CONCRETE FRAMES FOR PERFORMANCE BASED DESIGN Dr. Ashok Gupta Professor Department of Civil Engineering Indian Institute of Technology, Delhi

Capacity Spectrum Method using Pushover Analysis Performance based methodologies may be summarized by six tasks: Task 1: Specification of a performance objective. Task 2: Selection of a trial design. Task 3: Development of a mathematical model of the design. Task 4: Analysis of the mathematical model of the trial design. Task 5: Determination of the seismic demands on the trial design. Task 6: Assessments of the seismic performance of the designed structure at the global and element levels to ascertain that the performance objective specified in task 1 If the performance objective is not satisfied, the design is revised and tasks 3 to 5 are repeated

Capacity Spectrum Method using Pushover Analysis Capacity Curve: is a plot of the lateral load-deflection response of the building structure when applied to pushover analysis. Demand curve: The inelastic acceleration displacement response spectrum represents the demand curve The capacity curve is to be superimposed on demand curve Performance Point: The point where the demand curve of the earthquake intersects capacity curve of the building is termed as the performance point and defines the seismic demand

Case Studies for Analysis: Various layout of masonry infill panels Geometry no. Bare Frame Completely Infilled Frame Frame Without Infill at First Story Frame Partially Infilled at First Story 1 2 3 4 5 6

Capacity and Demand curve both in ADRS format for frame Geometry 3 [Sa = Spectral Acceleration, g = Acceleration due to Gravity, Sd = Spectral Displacement, H = Total Height of Building]

Capacity and demand curve both in ADRS format for frame Geometry 6 [Sa= Spectral Acceleration, g = Acceleration due to Gravity, Sd = Spectral Displacement, H = Total Height of Building]