Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
권호 표지
DOI QR코드

DOI QR Code

Evaluation and Adjustment of Lateral Displacement of Complex-shaped RC Tall Buildings Considering the Displacement by Tilt Angle of Each Floor

층경사각에 의한 횡변위를 고려한 비정형 고층건물의 횡변위 평가/보정

  • Kim, Yungon (R&D Division, Hyundai Engineering and Construction)
  • 김윤곤 (현대건설 연구개발본부)
  • Received : 2015.02.16
  • Accepted : 2015.07.31
  • Published : 2015.10.30
Download PDF
⟨ Previous Next ⟩

Abstract

Lateral displacement in the most complex-shaped tall buildings is caused by eccentric gravity loads which are induced by the difference in location between a center of mass and a center of stiffness. The lateral displacements obtained from analysis, using conventional procedures, are prone to overestimate the actual values because much of realignment efforts made during construction phase are ignored. In construction sequence analysis, the self-leveling of slab and the verticality of columns/walls could be considered at each construction stage. Moreover, the displacement compensation can be achieved by manual process such as re-centering - locating to global coordinates through surveying. Because the lateral displacement increases with the building height, it is necessary to set up adjustment plan through construction stage analysis in advance in order to result in displacements less than the allowable limits. Because analytical solution includes lots of assumptions, the pre-adjusting displacement should be reasonably controlled with considerations for the uncertainty due to these assumptions.

비정형 고층건물의 경우 편심중력하중에 의해 횡변위가 발생한다. 일반해석은 완공시점에 건물 조건을 기준으로 모든 하중을 고려하기 때문에, 시공중 부재 수직도 확보를 통해 각 단계별 보정량을 반영할 수 없어 골조자중에 의한 횡변위를 과대평가한다. 시공단계해석은 통상적인 시공과정에서 각 층마다 바닥평활도 및 기둥/벽체 수직도를 확보하는 것을 고려하여 타설이전에 발생하는 변형각을 보정하기 때문에 일반해석의 한계를 보완할 수 있다. 또한 계측을 통해 타설시점의 좌표를 설계좌표점으로 시공할 경우 각 시공단계에서 추가적인 횡변위보정(원점보정)이 가능하다. 횡변위는 고층부로 갈수록 급격히 증가하므로, 이러한 사전해석을 통해 합리적인 보정계획 수립이 가능하며, 이러한 보정에도 횡변위 관리기준를 초과하는 경우는 선보정 계획을 수립하여야 한다. 이때 사전해석의 불확실성 측면을 고려하여 선보정량을 결정하고, 실제 건물거동의 모니터링을 통해 선보정계획을 지속적으로 수정하여 건물수직도를 확보할 필요가 있다.

Keywords

References

  1. Fintel, M. and Khan, F., "Effects of column creep and shrinkage in tall structures-Prediction of inelastic column shortening", ACI Journal Proceedings, Vol.66, No.12, 1969, pp.957-967.
  2. Fintel, M. and Khan, F. R., "Effects of column creep and shrinkage in tall structures-analysis for differential shortening of columns and field observation of structures", ACI Special Publication, 1971, pp.27.
  3. Fintel, M., Ghosh, S., and Iyengar, H., "Column shortening in tall structures: prediction and compensation", Portland Cement Association, 1986.
  4. Gao, Z. and Bradford, M., "Time-dependent shortening of slender RC columns", Journal of engineering mechanics, Vol.119, No.10, 1993, pp.2036-2051. https://doi.org/10.1061/(ASCE)0733-9399(1993)119:10(2036)
  5. Pan, L., Liu, P., and Bakoss, S.. "Long-term shortening of concrete columns in tall buildings", Journal of Structural Engineering, Vol.119, No.7, 1993, pp.2258-2262. https://doi.org/10.1061/(ASCE)0733-9445(1993)119:7(2258)
  6. Song, H. et al., "Influence of Column Shortening in Tall Concrete Buildings", Korean Architectural Institute, Vol.13, No.12, 1997, pp.289-297.
  7. Kim, W. et al., "Measured and Predicted Column Shortening of a Tall Reinforced Concrete Building", Korean concrete institute, Vol.11, No.3, 1999, pp.161-170.
  8. Kim, H., Cho, S., and Kim, D., "Analysis and Field Measurement of Column Shortening of RC cores and SRC Columns in Tall Building", Korean Architectural Institute, Vol.19, No.11, 2003, pp.49-56.
  9. Park, H., "Optimal compensation of differential column shortening in high‐rise buildings", The structural design of tall and special buildings, Vol.12, No.1, 2003, pp.49-66. https://doi.org/10.1002/tal.212
  10. Kim, H. and Cho, S., "Column shortening of concrete cores and composite columns in a tall building", The Structural Design of Tall and Special Buildings, Vol.14, No.2, 2005, pp.175-190. https://doi.org/10.1002/tal.269
  11. Yi, T. and Tong, X., "Differential column shortening effects in typical medium to high-rise buildings", In Proceedings of Sessions of the 2007 Structures Congress, Long Beach, California, 2007, pp.16-19.
  12. Kim, H., "Column Shortening Analysis of Tall Building Considering the Restraints of Rebars and Horizontal Members", Korean Architectural Institute, Vol.24, No.6, 2008, pp.35-42.
  13. Ha, T. and Lee, S., "Advanced Construction Stage Analysis of High-rise Building considering Creep and Shrinkage of Concrete", the 2013 World Congress on Advances in Structural Engineering and Mechanics (ASEM13), 2013, pp.2139-2147.
  14. Abdelrazaq, A., "Validating the Structural Behavior and Response of Burj Khalifa: Synopsis of Full Scale Structural Health Monitoring Programs", International Journal of High- Rise Buildings, Vol.1, No.1, 2012, pp.37-51.
  15. Eom, T. and Kim, J., "An Application of Construction Sequence Analysis for Checking Stability in High-Rise Building under Construction", Computational Structural Engineering Institute of Korea, Vol.22, No.3, 2009, pp.211-222.