Journal of Korean Society of Steel Construction (한국강구조학회 논문집)

Korean Society of Steel Construction (한국강구조학회)
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Crack Width Control and Flexural Behavior of Continuous Composite Beams

연속합성보의 균열폭 제어와 휨거동 평가

  • Received : 2004.12.14
  • Accepted : 2005.03.15
  • Published : 2005.04.27
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Abstract

Experimental research was performed on the 6m-6m two-span, continuous composite beams. Background research for the crack width control of continuous composite bridges in the Eurocode-4 is reviewed and equationsfor the calculation of crack width considering tension stiffening are presented. The behavior of the continuous composite beams was investigated using the initial and stabilized cracking process of the concrete slab in tension. Test results showed that the current requirement of minimum reinforcement for ductility in Korea Highway Bridge Design Codes could be reduced. The flexural stiffness of cracked continuous composite beams can be evaluated by the uncracked section analysis until the stabilized cracking stage. An empirical equation for the relationship between the stress of tensile reinforcements and crack width was obtained from the test results.

6m-6m의 2경간 연속합성보에 대한 실험적 연구를 수행하였다. 유로코드에서 제시하고 있는 균열폭 제어 규정의 근거를 살펴보고 인장강화 효과를 고려한 균열상태에 따른 균열폭 계산식 유도과정을 제시하였다. 부모멘트 인장을 받는 바닥판의 거동을 초기균열, 안정화 균열로 나누어서 연속합성보의 거동을 평가하였다. 실험결과로부터 연성 기준을 만족하는 최소철근비는 현재 도로교설계기준보다 낮춰도 될 것으로 판단된다. 균열을 일으킨 연속합성보의 휨강성 평가에서는 안정화균열 이전단계까지는 비균열단면으로 보는 것이 적절하다. 인장철근의 응력과 균열폭의 관계식을 실험결과를 이용하여 제시하였다.

Keywords

Acknowledgement

Supported by : 중앙대학교

References

  1. 도로교통협회, 2000, 도로교설계기준
  2. AASHTO LRFD Bridge Design Specifications, Third Edition, 2004
  3. Bode, H., Fichter, W., Uth, H.-J. and Schanzenbach, J. (1987) Traglast von Verbund-Durchlaufträgern fur den Hoch-und Industriebau unter besonderer Berucksichtigung einer nachgiebigen Verdubelung, Bericht zum Forschungsauftrag Projekt 124 der Studiengesellschaft zur Anwendung von Eisen und Stahl e. V., Universität Kaiserslautern, Juni
  4. Eurocode 4 (2002) Design of composite steel and concrete structures, Part 2: Composite bridges (ENV 1994-2), CEN
  5. Hanswille, G. (1986) Zur Ri $\beta$breitenbeschrankung bei Verbundtragern. Techn.-Wiss. Mitteilung, 86-1, Institut fur Konstruktiven Ingenieurbau, Ruhr- Universitat Bochum
  6. Hanswille, G. (1997) Cracking of concrete- mechanical models of the design rules in Eurocode 4, Composite Construction in Steel and Concrete III, 420-433, ASCE
  7. Johnson R.P. (2002) The model of Eurocode 4 for the control of crack width, Research Report CE 66, School of Engineering, University of Warwick
  8. Johnson R.P. and Allison R.W. (1981) Shrinkage and tension stiffening in negative moment regions of composite beams, Structural Engineer, 59B, No. 1, 10-16, March
  9. Konig, G. and Tue, N. (1991) Calculating the mean bond and steel stress in reinforced and prestressed concrete members, Darmstadt Concrete, 6
  10. Konig, G. and Tue, N. (1992) Crack width control for concrete constructions, Darmstadt Concrete, 7
  11. Leonhardt, F. (1985) Zur Dauerfestigkeit von Stahlverbundtragern fur Eisenbahnbrucken, unveroffentlichter Vorabbericht uber Dauerfestig -keitsversuche an der MPA Stuttgart, August
  12. Roik, K. and Ehlert, W. (1979) Traglastversuche an schlanken zweifeldrigen Verbundtragern, Zwischen -bericht zum Forschungsvorhaben Ro 324/12 der Deutschen Forschungsgemeinschaft, April
  13. Roik K., Hanswille G. and Cunze-O. Lanna A. (1989a) Report on Eurocode 4 - Clause 5.3: cracking of concrete. Report EC4/4/88, pp 128, Ruhr-Universitat Bochum, March
  14. Roik, K., Hanswille, G., and Uhlendahl, J. (1989b) Ri $\beta$breitenbeschrankung bei Verbundtragern - Theorie und Versuche -, Nichtlineare Berechnungen im Konstruktiven Ingenieurbau, Berichte zum DFG-Schlu $\beta$kolloquim, Springer-Verlag, s. 540- 561, March
  15. Veljkovic, M., Johansson, B. (2004) Design of hybrid steel girders, Journal of Constructional Steel Research, Vol. 60, pp.535-547 https://doi.org/10.1016/S0143-974X(03)00128-7