A STUDY ON PLASTIC HINGE FORMATION IN RC FRAME BY NONLINEAR STATIC ANALYSIS

Ravikumara H S, Supriya R Kulkarni, K S Babu Narayan

Abstract: The design of effective structural system configured with all seismic performance objectives ranging from serviceability considerations to life safety and collapse prevention is the most important part of Seismic design. For seismic performance evaluation of structures, the static push over analysis which provides adequate information on seismic demands imposed by the ground motion has been popularized in recent decades. This evaluates the expected performance of a structure by estimating its strength and deformation demands to design ground motions by means of static inelastic analysis. The evaluation considers the factors such as global drift, interstorey drift, inelastic element deformations, deformation between elements etc. The first and most important step of this procedure, modeling of the structure demands the determination of the nonlinear properties of each component that are quantified by strength and deformation capacities. The factors that affect the ultimate deformation capacity of a structure also depends on the ultimate curvature and plastic hinge properties. The effect of plastic hinge properties in nonlinear analysis has been studied by many researchers. However, a little or negligible attention has given to understand the sequence of hinge formation and its effect. An attempt has been made in this paper to understand the order of hinge formation for ground motions and thereby tried to enhance the accuracy of push over analysis. A single bay single storied RC frame has been analyzed by using the software package SAP 2000 and hinges formed were observed with their order and location and results have been discussed.

Keywords: Push over Analysis, interstorey drift, Plastic hinge, nonlinear properties and SAP 2000

DOI: https://doi.org/10.15623/ijret.2015.0409031