The IUP Journal of Structural Engineering
Seismic Performance of RC Structures by Different Modeling Approaches

Article Details
Pub. Date : Oct, 2020
Product Name : The IUP Journal of Structural Engineering
Product Type : Article
Product Code : IJSE11020
Author Name : Ashwini L K, M Keshava Murthy, Ravikumar C M
Availability : YES
Subject/Domain : Science and Technology
Download Format : PDF Format
No. of Pages : 14

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Abstract

In elastic method of analysis, loaded structural elements do not reach up to collapse stage and the failure pattern cannot be traced out. Effect of the lateral forces, i.e., wind force and seismic force, makes the structure collapse and structural elements reach beyond the yield point. So, during seismic loads, structural elements show inelastic behavior. For inelastic behavior, suitable stress-strain curves have to be derived and analysis has to be performed. An attempt has been made in this paper to evaluate the behavior of the five-storey RC frame structure using SAP2000 by adopting the nonlinear static analysis and considering different modeling approaches. Mander's and Kent and Park's modeling approaches have been adopted for the performance of nonlinear static analysis and results are tabulated.


Description

Earthquake is a major challenge that humankind has been facing since the dawn of civilizations. The occurrence of an earthquake cannot be predicted and prevented, but the preparedness of the structures to resist earthquake forces has become more important. Seismic assessment and design of structures are required because of the occurrence of earthquakes. A recent approach to tackle the design and the seismic assessment is consideration of the performance-based earthquake engineering. Performance-based engineering deals with the estimation of quantities such as seismic capacity and seismic demands for different performance levels of the structure. Through seismic action, structural elements show nonlinear behavior. Nonlinear static analysis is a method of analysis, where the structure is loaded with monotonically increasing load along the height of the building until it reaches the target displacement or target force. The methodology is adopted and described in detail by many authors (Kadid and Boumrkik, 2008; Sarosh and Aslam, 2008; Dhileep et al., 2011; Ajay et al., 2012; Jeffrey and Franklin, 2012; Vaseghi et al., 2012; Kavita et al., 2013; and Nivedita and Swati, 2013). In this study, an attempt has been made to evaluate the structure by adopting the nonlinear static analysis and considering the different modeling approaches. The modeling approaches of Kent and Park (1971) and Mander et al. (1998) and are adopted for the performance of nonlinear static analysis. The modeling approaches involve the derivation of the stress-strain curve for the sectional member. The combined effect of concrete and steel is taken into consideration and suitable stress-strain curves are formed. Modeling approaches take into consideration the effects of the monotonic and cyclic loading conditions and simulate the hysteresis behavior of the structural elements. In concrete sections, confinement of reinforcements is made for resistance against lateral forces. Modeling approaches also give information about the strength degradation of the structural elements, and corresponding stress-strain results are plotted as smooth curves. A pushover analysis is performed on five-storey RC frame structure building using SAP2000 by adopting different modeling approaches for bare frame and infill frame and pushover curves are obtained.


Keywords

Pushover analysis, Mander's and Kent and Park's modeling approaches

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