Title:
Effects of Tendon Arrangements on Two-Way Unbonded Post-Tensioned Slab-Edge Column Connections
Author(s):
Farshad Janghorban, Abdollah Hoseini, and William L. Gamble
Publication:
Structural Journal
Volume:
117
Issue:
2
Appears on pages(s):
33-44
Keywords:
modeling; performance; post-tensioned (PT) concrete; shear cap; tendon arrangements; unbonded tendon
DOI:
10.14359/51720193
Date:
3/1/2020
Abstract:
This study investigated the effects of tendon arrangements on performance of the two-way unbonded post-tensioned (PT) slabedge column connections through finite element analysis. Two types of tendon arrangements—BD and DB—were imposed. First, four sets of test data of the two-way unbonded PT slab-edge column connections were verified by simulation. Then, effects of tendon arrangements in the presence and absence of a shear cap in the area of the slab-column connection and different concrete compressive strengths were investigated. The results indicated an increased initial stiffness, decreased flexural capacity, and a change in the type of connection failure if the tendon arrangements were banded perpendicular to the loading span. The presence of the shear cap in all samples along with the presence of each type of the tendon arrangements considerably increased the flexural capacity. The change of tendon arrangements from BD to DB, and vice versa, affected the flexural capacity and failure type.
Related References:
ABAQUS, “ABAQUS User’s Manual,” Pawtucket, RI, 2014.
Burns, N. H., and Hemakom, R., 1985, “Test of Post-Tensioned Flat Plate with Banded Tendons,” Journal of Structural Engineering, V. 111, No. 9, Sept., pp. 1899-1915. doi: 10.1061/(ASCE)0733-9445(1985)111:9(1899)
Carreira, D. J., and Chu, K. H., 1985, “Stress-Strain Relationship for Plain Concrete in Compression,” ACI Journal Proceedings, ASCE, V. 83, No. 6, Nov.-Dec., pp. 797-804.
Devalapura, R. K., and Tadros, M. K., 1992, “Stress-Strain Modeling of 270 ksi Low-Relaxation Prestressing Strands,” PCI Journal, V. 37, No. 2, pp. 100-106. doi: 10.15554/pcij.03011992.100.106
Foutch, D. A.; Gamble, W. L.; and Sunidja, H., 1990, “Tests of Post-Tensioned Concrete Slab-Edge Columns Connections,” ACI Structural Journal, V. 87, No. 2, Mar.-Apr., pp. 167-179.
Han, S. W.; Kee, S.-H.; Kang, T. H.-K.; Ha, S.-S.; Wallace, J. W.; and Lee, L.-H., 2006a, “Cyclic Behavior of Interior Post-Tensioned Flat Plate Connections,” Magazine of Concrete Research, V. 58, No. 10, Dec., pp. 699-711. doi: 10.1680/macr.2006.58.10.699
Han, S. W.; Kee, S.-H.; Park, Y.-M.; Lee, L.-H.; and Kang, T. H.-K., 2006b, “Hysteretic Behavior of Exterior Post-Tensioned Flat Plate Connections,” Engineering Structures, V. 28, No. 14, Dec., pp. 1983-1996. doi: 10.1016/j.engstruct.2006.03.029
Huang, Y., 2012, “Finite Element Method for Post-Tensioned Prestressed Concrete Structures,” PhD thesis, University of Oklahoma, Norman, OK, 326 pp.
Kang, T. H.-K., and Huang, Y., 2012, “Nonlinear Finite Element Analyses of Unbonded Post-Tensioned Slab-Column Connections,” PTI Journal, V. 8, No. 1, June, pp. 4-19.
Kang, T. H.-K.; Huang, Y.; Shin, M.; Lee, J. D.; and Cho, A. S., 2015, “Experimental and Numerical Assessment of Bonded and Unbonded Post-Tensioned Concrete Members,” ACI Structural Journal, V. 112, No. 6, Nov.-Dec., pp. 735-748. doi: 10.14359/51688194
Kosut, G. M.; Burns, N. H.; and Winter, C. V., 1985, “Test of Four-Panel Post-Tensioned Flat Plate,” Journal of Structural Engineering, ASCE, V. 111, No. 9, Sept., pp. 1916-1929. doi: 10.1061/(ASCE)0733-9445(1985)111:9(1916)
Long, A. E., and Cleland, D. J., 1993, “Post-Tensioned Concrete Flat Slabs at Edge Columns,” ACI Materials Journal, V. 90, No. 3, May-June, pp. 207-213.
Qaisrani, A.-N., 1993, “Interior Post-Tensioned Flat-Plate Connections Subjected to Vertical and Biaxial Lateral Loading,” PhD thesis, Department of Civil Engineering, University of California-Berkeley, Berkeley, CA, 303 pp.
Ragab, M. S.; Riad, K. H.; and Zaher, A. H., 2014, “Punching Behavior of Post-Tensioned High Strength Concrete Slabs,” World Applied Sciences Journal, V. 32, No. 4, pp. 527-539.
Ramos, A. P.; Lúcio, V. J. G.; and Faria, D. M. V., 2014, “The Effect of the Vertical Component of Prestress Forces on the Punching Strength of Flat Slabs,” Engineering Structures, V. 76, Oct., pp. 90-98. doi: 10.1016/j.engstruct.2014.06.039
Scanlon, A.; Schokker, A. J.; and Lee, S. C., 2012, “Effects of Tendon Layout on Service Load Performance of Post-Tensioned Two-Way Slab Systems,” PTI Journal, V. 8, No. 1, July, pp. 40-47.
Sunidja, H.; Foutch, D. A.; and Gamble, W. L., 1982, “Response of Prestressed Concrete Plate-Edge Column Connections,” Report No. UILU-ENG-82-2006, Structural Research Series No. 498, University of Illinois at Urbana-Champaign, Champaign, IL, Mar., 232 p