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The role of viscoelastic damping on retrofitting seismic performance of asymmetric reinforced concrete structures

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Abstract

The primary purpose of this research is to improve the seismic response of a complex asymmetric tall structure using viscoelastic (VE) dampers. Asymmetric structures have detrimental effects on the seismic performance because such structures create abrupt changes in the stiffness or strength that may lead to undesirable stress concentrations at weak locations. Structural control devices are one of the effective ways to reduce seismic impacts, particularly in asymmetric structures. For passive vibration control of structures, VE dampers are considered among the most preferred devices for energy dissipation. Therefore, in this research, VE dampers are implemented at strategic locations in a realistic case study structure to increase the level of distributed damping without occupying significant architectural space and reducing earthquake vibrations in terms of story displacements (drifts) and other design forces. It has been concluded that the seismic response of the considered structure retrofitted with supplemental VE dampers corresponded well in controlling the displacement demands. Moreover, it has been demonstrated that seismic response in terms of interstory drifts was effectively mitigated with supplemental damping when added up to a certain level. Exceeding the supplemental damping from this level did not contribute to additional mitigation of the seismic response of the considered structure. In addition, it was found that the supplemental damping increased the total acceleration of the considered structure at all floor levels, which indicates that for irregular tall structures of this type, VE dampers were only a good retrofitting measure for earthquake induced interstory deformations and their use may not be suitable for acceleration sensitive structures. Overall, the research findings demonstrate how seismic hazards to these types of structures can be reduced by introducing additional damping into the structure.

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Acknowledgement

The research is financially supported by the Ministry of Science and Technology of China (Grant No. 2017YFC0703603), National Natural Science Foundation of China (Grant No. 51678322), the Taishan Scholar Priority Discipline Talent Group program funded by the Shandong Province and the first-class discipline project funded by the Education Department of Shandong Province.

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Authors and Affiliations

  1. School of Civil Engineering, Qingdao University of Technology, Qingdao, 266033, China

    Zeshan Alam & Chunwei Zhang

  2. Centre for Infrastructure Engineering, Western Sydney University, Penrith, NSW, 2751, Australia

    Zeshan Alam, Chunwei Zhang & Bijan Samali

  3. No.11 Fushun Road, Shibei Dist., Qingdao, 266033, China

    Chunwei Zhang

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  1. Zeshan Alam
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  2. Chunwei Zhang
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Correspondence to Chunwei Zhang.

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Supported by: Ministry of Science and Technology of China under Grant No. 2017YFC0703603, National Natural Science Foundation of China under Grant No. 51678322

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Alam, Z., Zhang, C. & Samali, B. The role of viscoelastic damping on retrofitting seismic performance of asymmetric reinforced concrete structures. Earthq. Eng. Eng. Vib. 19, 223–237 (2020). https://doi.org/10.1007/s11803-020-0558-x

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  • DOI: https://doi.org/10.1007/s11803-020-0558-x

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