Seismic performance of repaired severely damaged precast columns with high-fiber reinforced cementitious composites
Post-tensioned precast concrete columns have advantage of re-centering capability for lateral movement by earthquakes. In this paper, cyclic tests were conducted for repaired and strengthened precast columns with severe damage by large lateral movement. Removing the damaged cover concrete and thickening by high performance fiber reinforced cementitious composite (HFRCC) was adopted. The jacket section had additional details of chemical anchors into the foundation and additional transverse reinforcing bars in the thickened concrete. The repair and strengthening increased the flexural strength and stiffness of prestressed precast concrete columns. The flexural strength of the repaired columns with additional chemical anchors was improved by more than 30%. When the shear failure of the jackets was prevented by adding transverse reinforcement, the repaired column showed stable flexural behavior at maximum load and thus enhances displacement ductility. Thickened jacket sections remarkably increased energy dissipation capacity through cracking and interface failure.
Keywordsprecast column cyclic behavior repair high-fiber reinforced cementitious composite energy dissipation
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- Bu, Z. Y., Ou, Y. C., Song, J. W., Zhang, N. S., and Lee, G. C. (2015). “Cyclic loading test of unbonded and bonded posttensioned precast segmental bridge columns with circular section.” Journal of Bridge Engineering, 04015043, DOI: 10.1061/(ASCE)BE.1943-5592.0000807.Google Scholar
- Hewes, J. T. and Priestley, M. J. N. (2002). Seismic design and performance of precast concrete segmental bridge columns, No. SSRP-2001/25, California Department of Transportation.Google Scholar
- Nakano, Y., Maeda, M., Kuramoto, H., and Murakami, M. (2004). Guideline for post-earthquake damage evaluation and rehabilitation of RC buildings in Japan, 13th World Conference on Earthquake Engineering, Vancouver, B.C., Canada, paper No. 124.Google Scholar
- Maeda, M., Matsukawa, K., and Ito, Y. (2014). Revision of guideline for post-earthquake damage evaluation of RC buildings in Japan, 10th US National Conference on Earthquake Engineering, Anchorage, Alaska, paper No. 942.Google Scholar
- Mander, J. B. and Cheng, C. T. (1997). Seismic design of bridge piers based on damage avoidance design, Technical Rep. NCEER-97-0014, National Center for Earthquake Engineering Research, Buffalo, N.Y.Google Scholar
- Shim, C. S., Lee, S. Y., Park, S. J., and Koem, C. (2016). Experiments on prefabricated segmental bridge piers with continuous longitudinal reinforcement, Engineering Structures, submitted.Google Scholar
- Shim, C. S., Song, H. H., and Koem, C. (2017). Cyclic behavior of repaired earthquake-damaged post-tensioned precast columns with HPFRCC, 16th World Conference on Earthquake, Santiago Chile, January 9th, will be published.Google Scholar
- Sun, L. Z., Wu, D. Y., Zhao, J. L., Yang, F., and Li, W. (2016). Behavior of Circular RC Columns with Two Layers of Spirals, online published June, DOI 10.1007/s12205-016-0928-0.Google Scholar