Seismic Response of a Three-Dimensional Asymmetric Multi-Storey Reinforced Concrete Structure

• Published in: Applied sciences Vol. 8; no. 4; p. 479
• Main Authors: Lim, Hyun-Kyu, Kang, Jun, Pak, Hongrak, Chi, Ho-Seok, Lee, Young-Geun, Kim, Janghwan
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.04.2018
• Subjects: Acceleration; asymmetric reinforced concrete structure; Asymmetric structures; Axial stress; Behavior; Buildings; Civil engineering; Compression; Compressive strength; Computer simulation; Concrete; Concrete construction; Concrete slabs; Concrete structures; Damping ratio; Displacement; Earthquakes; Error analysis; Failure surface; finite element model; Floors; Frequency analysis; Load; Mechanical properties; Modal damping; Modulus of elasticity; nonlinear seismic analysis; Nuclear accidents & safety; Nuclear engineering; Numerical analysis; Reinforced concrete; Safety regulations; Seismic design; Seismic engineering; Seismic response; seismic torsional behavior; SMART 2013 international benchmark; Systems analysis; Tensile strength; United Kingdom > UK; France; United States > US; Portugal
• ISSN: 2076-3417; 2076-3417
• DOI: 10.3390/app8040479

This study discusses the seismic behavior of a geometrically asymmetric three-storey reinforced concrete (RC) building, considering torsional effect and material nonlinearity. The building is a test structure that was used for seismic performance evaluation in the SMART 2013 (Seismic design and best-estimate Methods Assessment for Reinforced concrete buildings subjected to Torsion and nonlinear effects) international benchmark. To begin with, nonlinear stress–strain relationships that were set up for concrete and reinforcing steel are validated by finite element local tests with a representative volume element. A modal analysis shows that the first three calculated natural frequencies are close to the ones that are obtained by modal experiments. The finite element modeling is further validated by comparing the calculated displacement and acceleration due to a low-intensity ground motion with the responses from the corresponding shaking table test. Using the validated model, a blind nonlinear seismic analysis is performed for a series of Northridge earthquakes in order to estimate the behavior of the asymmetric RC structure to high-intensity ground motions. The calculated displacement and acceleration, as well as their response spectra at various sampling points, agree well with the results of a three-dimensional benchmark shaking table test. By investigating the seismic torsional behavior of the asymmetric RC structure, it is shown that the seismic response of an asymmetric structure is larger than that of a hypothetical symmetric structure. The result indicates that a larger seismic response should be considered in the seismic design of an asymmetric structure compared to a symmetric structure with similar design conditions.