The Impact of Scaling Methods and Strong Ground Motion Segments on the Seismic Behaviour of a Low‑Rise Tunnel‑Form System Building


Tozlu İ., Börekçi M.

IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY - TRANSACTIONS OF CIVIL ENGINEERING, vol.48, pp.1-13, 2024 (SCI-Expanded)

Abstract

Tunnel-Form System (TFS) has become widely preferred, both for their ability to meet the increased housing demand due to the speed of construction and their high seismic performance. This underscores the importance of understanding TFS buildings’ behaviour during earthquakes. To obtain realistic responses under earthquake efects, Nonlinear Time History Analysis (NLTHA) is an efective method and, accordingly selection of appropriate Ground Motion (GM) and their scaling to a target design spectrum is one of the important steps of NLTHA. In this study, the seismic behavior of a TFS building was analyzed using three pairs of GMs scaled with Amplitude Scaling Method (ASM) and Spectrum Matching Method (SMM). Due to the considerably large stifness matrices of the TFS buildings, NLTHA for that structure may require a signifcant amount of time and substantial data storage. To address this, the study investigates the potential for reducing analysis duration and data storage by shortening the records to their Signifcant Ground Motion (SGM) segment and comparing the results with those obtained with the original records. The analysis results indicate that the responses obtained with ASM exhibit greater variability compared to those obtained with SMM. Also, ASM yields greater responses than those for SMM and it is noteworthy that using GMs scaled with ASM is more conservative. Additionally, a comparison of results from the entire record and SGM segment has shown that using the SGM segment can signifcantly reduce analysis duration (60%) and the amount of data storage (70%) without substantially altering the responses.