Abstract
In multistoreyed RCC framed buildings, critical damages are due to seismic ground excitations, which cause catastrophic failuresat the weaker locations. Buildings with two types of structural irregularities namely diaphragm discontinuity and open ground story are considered. Assessment of seismic vulnerability of these buildings is done by using Nonlinear Static Pushover Analysis (NSPA). Performance Based Seismic Design of masonry infilled RCC buildings with two different shape of openings in the diaphragm is considered here with Design Basis Earthquake(DBE) and Maximum Considered Earthquake(MCE) where by selecting appropriate performance criteria in terms of Inter-story drift ratio(IDR) and Inelastic displacement demand ratio(IDDR) are critically observed. The Equivalent Linearization Procedure of Pushover analysis presented in FEMA 440, which is a modification of Capacity Spectrum Method based on ATC-40 guidelines, is performed in ETABS-2016 to study the performance of R.C.C. buildings with diaphragm discontinuity, designed as per IS-1893-2016.
Highlights
Diaphragm is a structural system which is used to transfer the major lateral loads to shear walls or frames primarily through in-plane shear mechanism
Gravity loads comprising of Dead load (DL) and Live load (LL) for sections were applied to slab and beam elements
The infill walls on the other hand increase the initial stiffness of the structure and reduce its ultimate deformation capacity under lateral loads
Summary
Diaphragm is a structural system which is used to transfer the major lateral loads to shear walls or frames primarily through in-plane shear mechanism. Monotonically increasing lateral loads with an invariant height-wise distribution until a target displacement is reached or the structure becomes unstable It consists of a series of sequential elastic analysis, superimposed to approximate a force-displacement curve of the overall structure, which iscalled the capacity curve. In force-controlled pushover procedure some numerical error may affect the accuracy of overall results as target displacement may be associated with minor value of lateral stiffness which is developed due to mechanisms and P-delta effects. This method allows us to trace the sequence of yielding and failures of structural members along with their performance levels as well as the progress of the overall capacity curve of the structure. Structural systems are mainly classified into four types namely, load-bearing walls, the frame systems, the moment resisting frames and the dual systems
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