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An effective simplified model of composite compression struts for partially-restrained steel frame with reinforced concrete infill walls

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Abstract

To resolve the issue regarding inaccurate prediction of the hysteretic behavior by micro-based numerical analysis for partially-restrained (PR) steel frames with solid reinforced concrete (RC) infill walls, an innovative simplified model of composite compression struts is proposed on the basis of experimental observation on the cracking distribution, load transferring mechanism, and failure modes of RC infill walls filled in PR steel frame. The proposed composite compression struts model for the solid RC infill walls is composed of α inclined struts and main diagonal struts. The α inclined struts are used to reflect the part of the lateral force resisted by shear connectors along the frame-wall interface, while the main diagonal struts are introduced to take into account the rest of the lateral force transferred along the diagonal direction due to the complicated interaction between the steel frame and RC infill walls. This study derives appropriate formulas for the effective widths of the α inclined strut and main diagonal strut, respectively. An example of PR steel frame with RC infill walls simulating simulated by the composite inclined compression struts model is illustrated. The maximum lateral strength and the hysteresis curve shape obtained from the proposed composite strut model are in good agreement with those from the test results, and the backbone curve of a PR steel frame with RC infill walls can be predicted precisely when the inter-story drift is within 1%. This simplified model can also predict the structural stiffness and the equivalent viscous damping ratio well when the inter-story drift ratio exceeds 0.5%.

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Acknowledgment

This research was financially supported by National Science Foundation of China (No. 51108292), and the Qing Lan project of Jiangsu Province. The authors wish to express their sincere gratitude to the sponsors.

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Authors and Affiliations

  1. School of Civil Engineering, Suzhou University of Science & Technology, Suzhou, 215011, China

    Guohua Sun & Qiang Gu

  2. School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA

    Walter Yang Chuang-Sheng & Reginald DesRoches

Authors
  1. Guohua Sun
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  2. Walter Yang Chuang-Sheng
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  3. Qiang Gu
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  4. Reginald DesRoches
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Corresponding author

Correspondence to Guohua Sun.

Additional information

Supported by: National Science Foundation of China under Grant No. 51108292, and Qing Lan Project of Jiangsu Province

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Sun, G., Chuang-Sheng, W.Y., Gu, Q. et al. An effective simplified model of composite compression struts for partially-restrained steel frame with reinforced concrete infill walls. Earthq. Eng. Eng. Vib. 17, 403–415 (2018). https://doi.org/10.1007/s11803-018-0449-6

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  • DOI: https://doi.org/10.1007/s11803-018-0449-6

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