DOI QR코드

DOI QR Code

Research of Residual Strain Calculation of Prestressed Concrete Beam Element

프리스트레스트 콘크리트 보 부재의 잔류변형 산정에 대한 연구

  • Lee, Duck-Ki (Ulsan College, School of Environment & Building Design)
  • 이덕기 (울산과학대학교 공간디자인학부)
  • Received : 2014.05.19
  • Accepted : 2014.06.26
  • Published : 2014.08.30

Abstract

To perform performance-based seismic design of buildings, it is necessary clear goal for usage and stability after an earthquake. To clear this goal, it requires a review of the constituent material of the building and, in particular, a member used as an indicator of the residual strain is useful. There are more usage of prestressed concrete because of prestressing steel witch has characteristics of the origin-oriented. In this study, the goal is estimating of residual strain on the prestressed concrete beam member. The expression for angle of deformed prestressed concrete beam member was obtained from using of curvature on the critical section and the equivalent plastic hinge length based on 'equivalent plastic hinge length method'. Considering the balance of strength and deformation conditions, suitable analysis values were derived from 'split Element Method'. Through various parametric studies, various factors affecting the residual strain were decided. Based on the results of this study, it is expected many researches will be proceed in the future.

성능 기반 내진설계를 위해서는 지진후 건물의 사용성과 복원성에 대한 명확한 목표가 필요하다. 이를 위해서는 건물의 구성 재료의 검토가 필요하고, 특히, 부재에 잔류하는 변형을 지표로 사용하는 것은 유용하다. 프리스트레스트 콘크리트는 PC 강재의 원점지향적 성질 덕분에 많이 이용이 될 것으로 생각된다. 이 연구는 PSC 보부재의 잔류 변형을 연구하고 산정하는 것에 목표를 두고 있다. '등가 소성 힌지 길이법'을 바탕으로 위험단면에서의 곡률과 등가 소성 힌지 길이를 이용하여 부재의 변형각을 구하는 식을 유도한다. '분할 요소 해석법'을 통하여 PC강재와 콘크리트 사이의 부착-미끄러짐을 고려하면서 힘의 균형과 변형을 적합 조건을 만족하는 해석값을 도출했다. 잔류 변형률에 영향을 미치는 각종 요인들을 파라미터 스터디를 통하여 잔류 변형률 산정식에 필요한 각종 수치를 결정했다. 그중에서 잔류변형에 많은 영향을 미치는 피크시 등가 소성 힌지 길이, 잔류 변형시 등가 소성 힌지 길이 및 피크시부터 잔류 변형시에 발생하는 위험 단면 위치에서의 곡률 감소량에 대하여 중점적으로 검토를 실시했다. 이 연구 결과를 바탕으로 앞으로 활발한 연구가 진행되기를 기대한다.

Keywords

References

  1. Sung-Hwan Yun et al., "Behavior of Columns Due to Variation of Performance Influencing Factors Based on Performance Based Design," Journal of KCI, Vol. 22, No. 4, 2010, pp. 489-498. https://doi.org/10.4334/JKCI.2010.22.4.489
  2. AIJ, "Ultimate Performance Evaluation Method of Prestressed Concrete Member," 2005, pp. 1-14.
  3. Enomoto Hidefumi, "Analytical Properties Related to the PRC Beams," Osaka University, 1981.
  4. MISUMI Tetsushi et al., "The Idealization of Stress- Strain Prestressing Steel Bar," AIJ, C-2, Structures IV, 1997, pp. 885-886.
  5. ISHII Takayuki et al.. "Estimation of Load Deformation Relations of PC Beams Using Equivalent Lengths of Plastic Hinge Zones and Analysis for Flexural Sections," AIJ, C-2, Structures IV, 1999, pp. 1043-1044.
  6. TATSUMI Hideaki et al., "Problems in Estimating Equivalent Plastic Hinge Length and P-$\delta$ Relation using the Length," JPCEA, Vol. 15, No. 1, 2006, pp. 49-52.
  7. F. Watanabe, J. Y. Lee, M. Nishiyama, "Structual Performance of Reinforced Concrete Columns with Different Grade Longitudinal Bars," ACI Structual Journal, Vol. 92, No. 4, 1995, pp. 412-418.
  8. Hiroshi Maeda et al., "Hysteretic Behavior Analysis Method of Precast PC Member," JCI, Vol. 27, No. 2, 2004, pp. 709-714.
  9. PCEA, "The Role of Attachment in the Steel Structure Performance Evaluation," 2005.
  10. MORITA Shiro et al., "Bond-Slip Relationship Under Repeated Loading," AIJ, Vol. 229, No. 1, 1975, pp. 15-24.
  11. D. G. Lee et al., "Comparison of the Residual Ratio of Prestressed Concrete Beam Member by the Defferent Analyzing Methods," JCI, Vol. 27, No. 2, 2005, pp. 583-588.
  12. NAKATSUKA Tadashi et al., "Experimental Study on Load Bearing and Deformation Mechanism and Structural Performance of Cnatilever Type Prestressed Concrete Beams with Different Connecting System (Compressed or Unit Type) and PC Tendon Type (Round or Deformed)," Concrete Research and Technology, Vol. 11, No. 3, 2000, pp. 97-110. https://doi.org/10.3151/crt1990.11.3_97
  13. Yoshihiro Ota et al., "An Experimental Study on Restoring Force Characteristics of the PC Member Having a Joint," AIJ, 2001, pp. 919-920.
  14. YUE Wei et al., "Impact of Steel Fixed Position on Mechanical Properties of the PC Outside Beam-to-Column Joint," JCI, Vol. 26, No. 2, 2004, pp. 661-666.
  15. Takeshiera et al., "Effect of Steel Type on the Mechanical Properties of the PC Beam-Column Connection," JCI, Vol. 24, No. 2, 2002, pp. 625-630.
  16. Himeno Yoichi, "An Experimental Study on Restoring Force Characteristics of the PRC Member," Osaka University, 1981.