Structural Engineering and Mechanics

  • 제52권4호
  • /
  • Pages.723-738
  • /
  • 2014
  • /
  • 1225-4568(pISSN)
  • /
  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Performance of non-prismatic simply supported prestressed concrete beams

  • Raju, P. Markandeya (Department of Civil Engineering, Maharaj Vijayram Gajapathi Raj College of Engineering) ;
  • Rajsekhar, K. (Department of Civil Engineering, College of Engineering, Andhra University) ;
  • Sandeep, T. Raghuram (Bhabha Atomic Research Centre)
  • 투고 : 2013.03.07
  • 심사 : 2014.05.26
  • 발행 : 2014.11.25
⟨ 이전 논문 다음 논문 ⟩

초록

Prestressing is the most commonly employed technique in bridges and long span beams in commercial buildings as prestressing results in slender section with higher load carrying capacities. This work is an attempt to study the performance of a minimum weight prestressed concrete beam adopting a non-prismatic section so that there will be a reduction in the volume of concrete which in turn reduces the self-weight of the structure. The effect of adopting a non-prismatic section on parameters like prestressing force, area of prestressing steel, bending stresses, shear stresses and percentage loss of prestress are established theoretically. The analysis of non-prismatic prestressed beams is based on the assumption of pure bending theory. Equations are derived for dead load bending moment, eccentricity, and depth at any required section. Based on these equations an algorithm is developed which does the stress checks for the given section for every 500 mm interval of the span. Limit state method is used for the design of beam and finite difference method is used for finding out the deflection of a non-prismatic beam. All the parameters of nonprismatic prestressed concrete beams are compared with that of the rectangular prestressed concrete members and observed that minimum weight design and economical design are not same. Minimum weight design results in the increase in required area of prestressing steel.

키워드

참고문헌

  1. Al-Gahtani, H.J. and Khan, M.S. (1998), "Exact analysis of non-prismatic beams", J. Eng. Mech., ASCE, 124(11), 1290-1293. https://doi.org/10.1061/(ASCE)0733-9399(1998)124:11(1290)
  2. Balkaya, C. (2001), "Behavior and modeling of non-prismatic members having T-sections", J. Eng. Mech., ASCE, 127(8), 940-946. https://doi.org/10.1061/(ASCE)0733-9399(2001)127:9(940)
  3. Brojan, M., Videnic, T. andKosel, F. (2007), "Non-prismatic non-linearly elastic cantilever beams subjected to an end moment", J. Reinf. Plast. Compos., 26, 1071-1082. https://doi.org/10.1177/0731684407079346
  4. Eisenberger, M. (1985), "Explicit stiffness matrices for non-prismatic members", Comput. Struct., 20(4), 715-720. https://doi.org/10.1016/0045-7949(85)90032-X
  5. El-Mezaini, N., Balkaya, C. and Citipitioglu, E. (1991), "Analysis of frames with non-prismatic beam elements", J. Eng. Mech., ASCE, 117(6), 1573-1592.
  6. Khan, M.S. and AL-Gahtani, H.J. (1996), "Analysis of continuous non-prismatic beams using boundary procedures", Proceedings ofThe Fourth Saudi Engineering Conference, November.
  7. Brojan, M. (2011), "Large deflections of non-prismatic non-linearly elastic cantilever beams subjected to non-uniform continuous load and a concentrated load at the free end", Int. J. Nonlin. Mech., 37, 439-443.
  8. Ramakrishnan, V. and Carlo, C. (1972), "Limit state design of prestressed concrete bridges", PCI J.
  9. Rossow, E.C. (1996), Analysis and behaviour of structures, Prentice-Hall, Inc., Upper Saddle River, N.J.
  10. Saffari, H. (2012), "Free vibration analysis of non-prismatic beams under variable axial forces", Struct. Eng. Mech., 43(5), 561-582. https://doi.org/10.12989/sem.2012.43.5.561
  11. Taylor, M.A. (1987), "Direct design of non-prismatic prestressed beams: I", J. Struct. Eng., ASCE, 113(6), 1154-1166. https://doi.org/10.1061/(ASCE)0733-9445(1987)113:6(1154)
  12. Taylor, M.A. (1987), "Direct design of non-prismatic prestressed beams: II", J. Struct. Eng., 113(6), 1167-1166. https://doi.org/10.1061/(ASCE)0733-9445(1987)113:6(1167)
  13. Yuksel, S.B. (2009a), "Behaviour of symmetrically haunched non-prismatic members subjected to temperature changes", Struct. Eng. Mech., 31(3), 297-314. https://doi.org/10.12989/sem.2009.31.3.297
  14. Yuksel, S.B. (2012), "Assessment of non-prismatic beams having symmetrical parabolic haunches with constant haunch length ratio of 0.5", Struct. Eng. Mech., 42(6), 849-866. https://doi.org/10.12989/sem.2012.42.6.849

피인용 문헌

  1. Neuro-fuzzy and artificial neural networks modeling of uniform temperature effects of symmetric parabolic haunched beams vol.56, pp.5, 2015, https://doi.org/10.12989/sem.2015.56.5.787