Crack and Deflection Control of Pretensioned Prestressed Beams

摘要

style="text-align: left;">Based on a series of laboratory tests on precast prestressed T and I beams, the authors propose crack width and deflection formulas for evaluating the serviceability of such members. Several numerical  examples show the applicability of the recommended  crack width equations.>References style="text-align: left;">1. Huang, P. T., "Serviceability Behavior and Crack Control in Pretensioned Prestressed Concrete I- and T-Beams," PhD Thesis under the direction of the first author, Rutgers University, June 1975, 338  pp. style="text-align: left;">2. Nawy, E. C., and Potyondy, J. C., "Moment Rotation, Cracking and Deflection of Spirally Bound, Pretensioned Prestressed Beams," Engineering Research Bulletin No. 51, Rutgers University, November 1970, 96 pp. style="text-align: left;">3. Nawy, E. G., and Potyondy, J. C., href="http://dx.doi.org/10.14359/11334 " title=""Flexural Cracking Behavior of Pretensioned, Prestressed Concrete I- and T-Beams,"" target="_blank">"Flexural Cracking Behavior of Pretensioned, Prestressed Concrete I- and T-Beams," ACI Journal, Proceedings V. 68, No. 5, May 1971, pp.  355-360. style="text-align: left;">4. Nawy, E. G., href="http://dx.doi.org/10.14359/7515 " title=""Crack Control in Reinforced Concrete Structures," " target="_blank">"Crack Control in Reinforced Concrete Structures," ACI Journal, Proceedings V. 65, October 1968, pp. 825-836. style="text-align: left;">5. ACI Committee 224, href=" http://dx.doi.org/10.14359/11280 " title=""Control of Cracking in Concrete Structures", " target="_blank">"Control of Cracking in Concrete Structures", ACI Journal, Proceedings V. 69, No. 12, December 1972, pp. 717-752. style="text-align: left;">6. Ferry-Borges, J. N., "Preliminary Report," Comite Europeen du Beton, Commission IV a-Cracking. style="text-align: left;">7. Holmberg, A., and Lindgern, S.,"Crack Spacing and Crack Width due  to Normal Force or Bending Moment,"Document D2:1970, National Swedish Building Research. style="text-align: left;">8. Holmberg, A., "Flexural Crack Width," Nordisk Betong, 1970.  style="text-align: left;">9. CEB-FIP, "International Recommendations for the Design and Constructionof Concrete Structures," Comite Europeen du Beton/Federation Internationale de la Precontrainte, Paris (English Edition  Published by the Cement and Concrete Association, London), 1970, pp. 1-80, Appendix V, pp. 1-47. style="text-align: left;">10. Abeles, P. W., href=" http://dx.doi.org/10.14359/7595 " title=""Design of Partially  Prestressed Concrete Beams,"" target="_blank">"Design of Partially  Prestressed Concrete Beams," ACI Journal, Proceedings V. 64, No. 10,October 1967, pp. 669-677. style="text-align: left;">11. ACI Committee 318, href="http://dx.doi.org/10.14359/15231 " title=""Building Code Requirements for Reinforced Concrete  (ACI 318-71),"" target="_blank">"Building Code Requirements for Reinforced Concrete  (ACI 318-71)," American ConcreteInstitute, Detroit, 1971, 78 pp. style="text-align: left;">12. ACI Committee 318, "Commentary on the Building Code Requirements for  Reinforced Concrete (ACI 318-71C)," American Concrete Institute, Detroit, 1971, 96 pp. style="text-align: left;">13. Branson, D. E., "Instantaneous and Time-Dependent Deflections of Simple and Continuous Reinforced Concrete Beams," Part 1, Report No. 7, Alabama Highway Research Report, Bureau of Public   Roads, August 1963. style="text-align: left;">14. PCI Design Handbook-Precast and Prestressed Concrete, Prestressed Concrete  Institute, Chicago, 1971, pp. 1-1to 12-8.