Browse > Article
http://dx.doi.org/10.4334/JKCI.2009.21.3.347

Applicability of Partial Post-Tension Method for Deflection Control of Reinforced Concrete Slabs  

Lee, Deuck-Hang (Dept. of Architectural Engineering, University of Seoul)
Kim, Kang-Su (Dept. of Architectural Engineering, University of Seoul)
Kim, Sang-Sik (Dept. of Architectural Engineering, Inha University)
Kim, Yong-Nam (Samsung Engineering and Construction, Housing Division)
Lim, Joo-Hyuk (Samsung Engineering and Construction, Housing Division)
Publication Information
Journal of the Korea Concrete Institute / v.21, no.3, 2009 , pp. 347-358 More about this Journal
Abstract
Recently, it is getting into a good situation for the flat-plate slab system to be applied. The flat-plate slab without beam, however, is often too weak to control deflection properly compared to other typical slab-beam structures, for which the post-tension method is generally regarded as one of best solutions. The post-tension (PT) method can effectively control deflection without increase of slab thickness. Despite this good advantage, however, the application of PT method has been very limited due to cost increase, technical problems, and lack of experiences. Therefore, in order to reduce difficulties on applying full PT method under the current domestic circumstances and to enhance constructability of PT system, this research proposed the partial PT method with top jacking anchorage applied in a part of span as need. For the top jacking anchorage system, the efficiency of deflection control shall be considered in detail because it can vary widely depending on the location of anchorage that can be placed anywhere as need, and tensile stresses induced at back of the anchorage zone also shall be examined. Therefore, in this study, analysis were performed on the efficiency of deflection control depending on the location of anchorage and on tensile stresses or forces using finite element method and strut and tie model in the proposed top jacking anchorage system. The proposed jacking system were also applied to the floor slabs at a construction site to investigate its applicability and the analysis results of slab behavior were compared to the measured values obtained from the PT slab constructed by the partial PT method. The result of this study indicates that the partial PT method can be very efficiently applied with little cost increase to control deflection and tensile stresses in the region as a need basis where problem exists.
Keywords
partial prestressed method; post-tension; top anchorage system; deflection control; tensile stress;
Citations & Related Records
연도 인용수 순위
  • Reference
1 공동주택 바닥충격음 차단구조 인정 및 관리기준, 건설교통부 고시 제2006-435호, 2006, 29 pp.
2 Nilson, A. H. and Walters, D. B., “Deflection of Two-Way Floor System by Equivalent Frame Method,” ACI Structural Journal, Vol. 72, No. 5, 1975, pp. 210-218
3 Nilson, A. H., Design of Prestressed Concrte, 2nd ed., John Wiley & Sons. pp. 1987, 426-439
4 Alami, B. O., 정광량, 포스트 텐션 바닥시스템의 설계, 태림 문화사, 2003, 238 pp.
5 ACI Committee 318, Building Code Requirements for Structural Concrete and Commentary (ACI 318M-05), American Concrete Institute, Farmington Hills, 2005, pp 276-282
6 PTI (Post Tention Institute), Post-Tensioning Manual, 6th ed., Post-Tensioning Institute, 2006, 354 pp.
7 Collins, M. P. and Mitchell, D., Prestressed Concrete Structures, Prentice-Hall, Englewood Cliffs, NJ, 1991, 766 pp.
8 Alami, B. O., “Load Balancing : Comperhensive Solution to Post-Tensioning,” ACI Structural Journal, Vol. 87, No. 6, 1990, pp. 662-670
9 한국콘크리트학회, 콘크리트구조설계기준해설, 한국콘크리트학회, 2007, pp. 252-27
10 ADAPT, ADAPT-FLOOR PRO User Manual, ADAPT Corp, 2007, 298 pp.
11 Hibbeler, R. C., Stuctural Analysis, Prentice-Hall, Inc., 2006, 644 pp.
12 건축법 시행령, 일부개정 2008.9.22 대통령령 제21025호, 2008, 103 pp.
13 한국콘크리트학회, 주거용 건물의 부분PT공법 최적화 연구, 한국콘크리트학회, 2008, 256 pp.
14 Nawy, E. G., Prestressed Concrete Fundamental Approach, Fifth Edition, Prentice-Hall, 2006, 945 pp.
15 CAST, http://cee.uiuc.edu/kuchma/strut_and_tie/, 2005