Curvature ductility of columns and structural displacement ductility in RC frame structures subjected to ground motions |
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| Institution: | 1. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China;2. Department of Civil Engineering, Xiangtan University, Xiangtan 411105, China;1. School of Civil and Environmental Engineering, Nanyang Technological University, Singapore 639798, Singapore;2. School of Civil Engineering, Chongqing University, Chongqing 400045, China;1. Department of Structures for Engineering and Architecture, DIST, University of Naples Federico II, Via Claudio, 21, 80125 Naples, Italy;2. Department of Mechanics of the Continuum Media and Theory of Structures, Polytechnic University of Valencia, Camino de Vera, s/n, 46022 Valencia, Spain;3. Department of Civil Engineering, University of Bristol, Queen’s Building University Walk, BS8 1TR Bristol, UK;1. Indian Institute of Technology Hyderabad 502285, India;2. IcfaiTech, IFHE, Hyderabad 502285, India;3. 2820 Prestwood Drive, Cumming, GA 30040, USA;4. Research Data Scientist, Mangalathu, Mylamkulam, Puthoor P O, Kollam, Kerala 691507, India;1. Hassan II University, ENSAM Casablanca, MoroccoEquipe de modélisation et simulation des structures en Génie Civil (M2SGC), Morocco;2. Chouaib Doukkali University, FS El-Jadida, MoroccoLaboratoire de mécanique et énergétique, Morocco;3. Mechanical and Civil Engineering Department, Polytechnic High School of Algeciras, University of Cadiz, Spain;4. Mohammed V University of Rabat, Department of Chemistry, Morocco |
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| Abstract: | This paper examined the statistical relationship between the curvature ductility demands of columns and the global displacement ductility demands of reinforced concrete (RC) frame structures when subjected to earthquakes. Elements with a designated moment–curvature relationship were adopted for both beam and column elements, and five-story and ten-story RC frame numerical structures were established. Using pushover analysis and earthquake nonlinear dynamic time-history analysis, the maximum global displacement ductility demands of the structure and the maximum curvature ductility demands of the columns were determined. The effects of the spectral acceleration and the strong column factor on ductility demands were analyzed, and the quantitative relationship between the curvature ductility demands of columns and the global displacement ductility demands of frame structures were established. Moreover, the validity of the established relationship was further tested and verified through a real-world application. The results show that the maximum curvature ductility demands of the columns and the maximum displacement ductility demands of the structure were positively associated with the spectral acceleration and negatively associated with the strong column factor. A proposed first-degree linear relationship between curvature ductility of columns and structural displacement ductility in RC frame structures with two parameters was obtained by curve fitting, while considering the effect of the strong column factor. The model was highly correlated with the sampling analysis data. Applying the empirical model established in this study is a simple and effective means to guide the design of ductility and the assessment of RC frame columns. |
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| Keywords: | Reinforced concrete Frame structure Structural displacement ductility Curvature ductility Strong column factor Earthquake action |
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