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New factor to characterize mechanism of “strong column-weak beam” of RC frame structures

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Abstract

Most reinforced concrete(RC)frame structures did not achieve the “strong column-weak beam” failure mode in recent big earthquakes, resulting in a large number of casualties and significant property loss. To deal with this serious problem, a new column-beam relative factor was proposed to characterize the relative yield situation of column ends and beam ends. By limiting the column-beam relative factor, RC frame structures could achieve the “strong column-weak beam” failure mode under the excitation of strong ground motions. The limit values of column- beam relative factor were calculated, analyzed and verified by using structural simulation models for corner columns in the bottom story of structures, which are destroyed most seriously in earthquakes. The results show that the limit values should be analyzed under bi-directional ground motion and with different axial compression ratios of columns. The peak ground acceleration(PGA)of ground motions has no significant effect on the limit values, while the type of strong ground motions has a significant effect on the limit values.

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Author information

Authors and Affiliations

  1. School of Civil Engineering, Tianjin University, Tianjin, 300072, China

    Xinxia Li  (李心霞) & Qinghua Han  (韩庆华)

  2. Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin, 150080, China

    Maosheng Gong  (公茂盛) & Lili Xie  (谢礼立)

  3. Key Laboratory of Coast Civil Structure Safety of Ministry of Education, Tianjin University, Tianjin, 300072, China

    Qinghua Han  (韩庆华)

Authors
  1. Xinxia Li  (李心霞)
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  2. Maosheng Gong  (公茂盛)
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  3. Qinghua Han  (韩庆华)
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  4. Lili Xie  (谢礼立)
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Corresponding author

Correspondence to Qinghua Han  (韩庆华).

Additional information

Supported by the National Natural Science Foundation of China (No.51525803), the Scientific and Technological Development Plans of Tianjin Construction System (No. 2013-35), International Science & Technology Cooperation Program of China (No. 2012DFA70810) and the Basic Science Research Foundation of IEM, CEA (No. 2013B07).

Li Xinxia, born in 1989, female, doctorate student.

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Li, X., Gong, M., Han, Q. et al. New factor to characterize mechanism of “strong column-weak beam” of RC frame structures. Trans. Tianjin Univ. 21, 484–491 (2015). https://doi.org/10.1007/s12209-015-2639-x

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  • DOI: https://doi.org/10.1007/s12209-015-2639-x

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