Structural Engineering and Mechanics

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Seismic performance and damage assessment of reinforced concrete bridge piers with lap-spliced longitudinal steels

  • Chung, Young S. (Department of Civil Engineering, Chung-Ang University) ;
  • Park, Chang K. (Department of Civil Engineering, Chung-Ang University) ;
  • Lee, Eun H. (Department of Civil Engineering, Chung-Ang University)
  • Received : 2003.06.09
  • Accepted : 2003.10.11
  • Published : 2004.01.25
⟨ Previous Next ⟩

Abstract

It is known that lap splices in the longitudinal reinforcement of reinforced concrete (RC) bridge columns are not desirable for seismic performance, but it is sometimes unavoidable. Lap splices were practically located in the potential plastic hinge region of most bridge columns that were constructed before the 1992 seismic design provisions of the Korea Bridge Design Specification. The objective of this research is to evaluate the seismic performance of reinforced concrete (RC) bridge piers with lap splicing of longitudinal reinforcement in the plastic hinge region, to develop an enhancement scheme for their seismic capacity by retrofitting with glassfiber sheets, and to assess a damage of bridge columns subjected to seismic loadings for the development of rational seismic design provisions in low or moderate seismicity region. Nine (9) test specimens with an aspect ratio of 4 were made with three confinement ratios and three types of lap splice. Quasi-static tests were conducted in a displacement-controlled way under three different axial loads. A significant reduction of displacement ductility was observed for test columns with lap splices of longitudinal reinforcements, whose displacement ductility could be greatly improved by externally wrapping with glassfiber sheets in the plastic hinge region. A damage of the limited ductile specimen was assessed to be relatively small.

Keywords

References

  1. Aboutaha, R.S., Engelhardt, M.D., Jirsa, J.O. and Kreger, M.E. (1999), "Experimental investigation of seismic repair of lap splice failures in damaged concrete columns", ACI Struct. J., 96(2), 297-307.
  2. Chang, S.P., Kim, J.K., Kim, I.H. and Lim, H.W. (2000), "The influence of lap splice of longitudinal bars in the plastic hinge zone on the nonlinear behavior characteristics of RC piers and new seismic detailing concept in moderate seismicity region", Proc. the Earthq. Eng. Soc. Korea Conf,, 4(1), 335-340.
  3. Chai, Y., Priestley, M.J.N. and Seible, F. (1991), "Seismic retrofit of circular bridge columns for enhanced flexural performance", ACI Struct. J., 88(5), 572-584.
  4. Chung, Y.S., Lee, K.K., Han, G.H. and Lee, D.H. (1999), "Quasi-static test for seismic performance of circular R.C. bridge piers before and after retrofitting", J. of the Korea Concrete Institute, 11(5), 107-118.
  5. Einea, A., Yehia, S. and Tadros, M.K. (1999), "Lap splices in confined concrete", ACI Struct. J., 96(6), 947-955.
  6. Jaradat, O.A., McLean, D.I. and Marsh, M.L. (1998), "Performance of existing bridge columns under cyclic loading - Part 1: Experimental results and observed behavior", ACI Struct. J., 95(6), 695-704.
  7. Ministry of Construction and Transportation (2000), "Korea highway bridge design specification", Korea Road & Transportation Association.
  8. Park, Y.J. and Ang, Alfredo H.-S. (1985), "Mechanistic seismic damage model for reinforced concrete", J. of Struct. Eng., 111(4), APR., 722-739. https://doi.org/10.1061/(ASCE)0733-9445(1985)111:4(722)
  9. Priestley, M.J.N., Seible, F. and Calvi, G.M. (1996), Seismic Design and Retrofit of Bridges, John Wiely & Sons Inc., New York.
  10. Priestley, M.J.N., Seible, F., MacRae, G.A. and Chai, Y. (1997), "Seismic assessment of the Santa Monica Viaduct Bent details", ACI Struct. J., 94(5), 513-524.
  11. Saadatmanesh, H., Ehsani, M.R. and Jin, L. (1996), "Seismic strengthening of circular bridge pier models with fiber composites", ACI Struct. J., 93(6), 639-647.
  12. Tepfers, R. (1982), "Lapped tensile reinforcement splices", ASCE, 108, No. ST1, Jan.

Cited by

  1. Seismic protection of lap-spliced RC columns using SMA wire jackets vol.64, pp.3, 2012, https://doi.org/10.1680/macr.10.00181
  2. Effect of steel wrapping jackets on the bond strength of concrete and the lateral performance of circular RC columns vol.48, 2013, https://doi.org/10.1016/j.engstruct.2012.08.026
  3. A computational platform for seismic performance assessment of reinforced concrete bridge piers with unbonded reinforcing or prestressing bars vol.5, pp.2, 2008, https://doi.org/10.12989/cac.2008.5.2.135
  4. 원형 철근콘크리트 교각의 내진성능 I. 심부구속철근비 영향 변수 평가 vol.17, pp.4, 2005, https://doi.org/10.4334/jkci.2005.17.4.603
  5. 원형 철근콘크리트 교각의 내진성능 II. 심부구속철근비 제안 vol.17, pp.5, 2004, https://doi.org/10.4334/jkci.2005.17.5.775
  6. 철근콘크리트 교각의 연성 능력에 따른 지진취약도 vol.19, pp.1, 2004, https://doi.org/10.4334/jkci.2007.19.1.091
  7. 원형 철근콘크리트 교각에 대한 연성도 내진설계법의 안전성 vol.20, pp.2, 2004, https://doi.org/10.4334/jkci.2008.20.2.193
  8. Maximum axial load level and minimum confinement for limited ductility design of high-strength concrete columns vol.6, pp.5, 2004, https://doi.org/10.12989/cac.2009.6.5.357