A Review on Nonlinear Time History Analysis of Structures

Abstract

Nonlinear time history analysis (NTHA) is a powerful approach for assessing the seismic response of buildings, enabling engineers to better understand and predict the structural behavior under dynamic loading. This review focuses on the tools, methods, and input parameters used in NTHA of buildings. The review begins by introducing the concept of NTHA and its significance in evaluating the structural response to earthquakes. Various software tools commonly employed for conducting such analyses are discussed, including more common commercial programs and open-source alternatives often used by researchers. The capabilities, features, and limitations of these tools are mentioned to help researchers and practitioners choose the most suitable software for their specific needs. Additionally, the review covers strategies for modeling various structural components, including beams, columns, and connections, with an emphasis on accurately capturing the nonlinear behavior. Next, the review delves into the methods employed in NTHA. Some of the methods employed in NTHA are Direct integration method, Modal superposition technique and Fast nonlinear analysis (FNA) method. Furthermore, the selection of input parameters plays a critical role in achieving reliable results in NTHA. This review discusses the key input parameters, such as damping models, ground motion records, and loading patterns. In conclusion, this review provides insights into the tools, methods, and input parameters used in NTHA of buildings to help engineers and researchers in undertaking optimal seismic design and assessment of structures.