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Structural Engineering and Mechanics
  Volume 74, Number 6, June25 2020, pages 789-807

Non-linear dynamic assessment of low-rise RC building model under sequential ground motions
Syed Muhammad Bilal Haider, Zafarullah Nizamani and Chun Chieh Yip

    Multiple earthquakes that occur during short seismic intervals affect the inelastic behavior of the structures. Sequential ground motions against the single earthquake event cause the building structure to face loss in stiffness and its strength. Although, numerous research studies had been conducted in this research area but still significant limitations exist such as: 1) use of traditional design procedure which usually considers single seismic excitation; 2) selecting a seismic excitation data based on earthquake events occurred at another place and time. Therefore, it is important to study the effects of successive ground motions on the framed structures. The objective of this study is to overcome the aforementioned limitations through testing a two storey RC building structural model scaled down to 1/10 ratio through a similitude relation. The scaled model is examined using a shaking table. Thereafter, the experimental model results are validated with simulated results using ETABS software. The test framed specimen is subjected to sequential five artificial and four real-time earthquake motions. Dynamic response history analysis has been conducted to investigate the i) observed response and crack pattern; ii) maximum displacement; iii) residual displacement; iv) Interstorey drift ratio and damage limitation. The results of the study conclude that the low-rise building model has ability to resist successive artificial ground motion from its strength. Sequential artificial ground motions cause the framed structure to displace each storey twice in correlation with vary first artificial seismic vibration. The displacement parameters showed that real-time successive ground motions have a limited impact on the low-rise reinforced concrete model. The finding shows that traditional seismic design EC8 requires to reconsider the traditional design procedure.
Key Words
    time history analysis; reinforced concrete framed structure; sequential ground motions; shaking table; ETABS; Buckingham π theorem
Syed Muhammad Bilal Haider, Zafarullah Nizamani: Department of Environmental Engineering, Universiti Tunku Abdul Rahman, 31900 Kampar, Malaysia
Chun Chieh Yip: Department of Civil Engineering, Universiti Tunku Abdul Rahman, 43000 Kajang, Malaysia

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