Title:
A Statistical Approach to Refine Design Codes for Interface Shear Transfer in Reinforced Concrete Members
Author(s):
Mahmoodreza Soltani, Brandon E. Ross, and Amin Khademi
Publication:
Structural Journal
Volume:
115
Issue:
5
Appears on pages(s):
1341-1352
Keywords:
cold joints; design model; lightweight concrete; normalweight concrete; sensitivity analysis; shear friction
DOI:
10.14359/51702239
Date:
9/1/2018
Abstract:
Interface shear transfer (IST) theory describes the mechanisms by which shear force is transferred across concrete-to-concrete
interfaces. Previous research has shown that current code-based IST models produce inconsistent levels of accuracy for different values of design parameters (that is, material strength, reinforcement density, and member size). Objectives for the current research were to identify parameters having the greatest impact on the IST capacity, and to create a model that produces consistent levels of accuracy. Using a database of experimental results, an artificial neural network model was created to estimate IST strength and to perform a sensitivity analysis of the parameters affecting capacity. The sensitivity analysis demonstrated that compressive strength of concrete is the most significant parameter affecting IST capacity. A multiple linear-regression analysis was also performed to aid in
development of a new IST design model. Based on the results of
the sensitivity analysis, and in contrast to current model codes, the proposed IST model directly accounts for compressive strength of concrete as one of the model parameters. The model is strongly correlated (R2 ≥ 0.88 and p-values << 0.01) with the experimental data, and relative to current codes, it produces more consistent levels of accuracy across ranges of design parameters.
Related References:
1. Soltani, M., and Ross, B. E., “Database Evaluation of Interface Shear Transfer in Reinforced Concrete Members,” ACI Structural Journal, V. 114, No. 2, Mar.-Apr. 2017, pp. 383-394. doi: 10.14359/51689249
2. AASHTO, “AASHTO LRFD Bridge Design Specifications,” seventh edition, American Association of State Highway and Transportation, Washington, DC, 2014.
3. Mansour, M. Y.; Dicleli, M.; Lee, J.-Y.; and Zhang, J., “Predicting the Shear Strength of Reinforced Concrete Beams Using Artificial Neural Networks,” Engineering Structures, V. 26, No. 6, 2004, pp. 781-799. doi: 10.1016/j.engstruct.2004.01.011
4. Kasperkiewicz, J.; Racz, J.; and Dubrawski, A., “HPC Strength Prediction Using Artificial Neural Network,” Journal of Computing in Civil Engineering, ASCE, V. 9, No. 4, 1995, pp. 279-284. doi: 10.1061/(ASCE)0887-3801(1995)9:4(279)
5. Santos, P. M. D., and Júlio, E. N. B. S., “A State-of-the-Art Review on Shear-Friction,” Engineering Structures, V. 45, 2012, pp. 435-448. doi: 10.1016/j.engstruct.2012.06.036
6. Jimenez-Perez, R.; Gergely, P.; and White, R. N., “Shear Transfer Across Cracks in Reinforced Concrete,” Report No. PB-288885, Cornell University, Ithaca, NY, 1978, 375 pp.
7. Mast, R. F., “Auxiliary Reinforcement in Concrete Connections,” Journal of the Structural Division, ASCE, V. 94, No. 6, 1968, pp. 1485-1504.
8. Birkeland, P. W., and Birkeland, H. W., “Connections in Precast Concrete Construction,” ACI Journal Proceedings, V. 63, No. 3, Mar. 1966, pp. 345-368.
9. Eurocode 2, “Design of Concrete Structures,” British Standards Institution, London, UK, 2004.
10. CSA A23.3-14, “Design of Concrete Structures,” Canadian Standards Association, Mississauga, ON, Canada, 2014.
11. Kartam, N.; Flood, I.; and Garrett, J. H., “Artificial Neural Networks for Civil Engineers: Fundamentals and Applications,” American Society of Civil Engineers, Reston, VA, 1997, 216 pp.
12. Mitchell, T. M., “Artificial Neural Networks,” Machine Learning, V. 45, 1997, pp. 81-127.
13. Liong, S.-Y.; Lim, W.-H.; and Paudyal, G. N., “River Stage Forecasting in Bangladesh: Neural Network Approach,” Journal of Computing in Civil Engineering, ASCE, V. 14, No. 1, 2000, pp. 1-8. doi: 10.1061/(ASCE)0887-3801(2000)14:1(1)
14. Masters, T., Practical Neural Network Recipes in C++, Morgan Kaufmann, Burlington, MA, 1993.
15. Demirbaş, A. E., “Modelling of Seismically Excited Structures Using ANN,” master’s thesis, Middle East Technical University, Ankara, Turkey, 1998.
16. Öztaş, A.; Pala, M.; Özbay, E.; Kanca, E.; Cağlar, N.; and Bhatti, M. A., “Predicting the Compressive Strength and Slump of High Strength Concrete Using Neural Network,” Construction and Building Materials, V. 20, No. 9, 2006, pp. 769-775. doi: 10.1016/j.conbuildmat.2005.01.054
17. Jain, A. K.; Mao, J.; and Mohiuddin, K. M., “Artificial Neural Networks: A Tutorial,” Computer, V. 29, No. 3, 1996, pp. 31-44. doi: 10.1109/2.485891
18. Flood, I., and Kartam, N., “Neural Networks in Civil Engineering. I: Principles and Understanding,” Journal of Computing in Civil Engineering, ASCE, V. 8, No. 2, 1994, pp. 131-148. doi: 10.1061/(ASCE)0887-3801(1994)8:2(131)
19. Cladera, A., and Marí, A. R., “Shear Design Procedure for Reinforced Normal and High-Strength Concrete Beams Using Artificial Neural Networks. Part I: Beams without Stirrups,” Engineering Structures, V. 26, No. 7, 2004, pp. 917-926. doi: 10.1016/j.engstruct.2004.02.010
20. Sanad, A., and Saka, M. P., “Prediction of Ultimate Shear Strength of Reinforced-Concrete Deep Beams Using Neural Networks,” Journal of Structural Engineering, ASCE, V. 127, No. 7, 2001, pp. 818-828. doi: 10.1061/(ASCE)0733-9445(2001)127:7(818)
21. Elshafey, A. A.; Rizk, E.; Marzouk, H.; and Haddara, M. R., “Prediction of Punching Shear Strength of Two-Way Slabs,” Engineering Structures, V. 33, No. 5, 2011, pp. 1742-1753. doi: 10.1016/j.engstruct.2011.02.013
22. Yeh, I.-C., “Design of High-Performance Concrete Mixture Using Neural Networks and Nonlinear Programming,” Journal of Computing in Civil Engineering, ASCE, V. 13, No. 1, 1999, pp. 36-42. doi: 10.1061/(ASCE)0887-3801(1999)13:1(36)
23. Bai, J.; Wild, S.; Ware, J. A.; and Sabir, B. B., “Using Neural Networks to Predict Workability of Concrete Incorporating Metakaolin and Fly Ash,” Advances in Engineering Software, V. 34, No. 11-12, 2003, pp. 663-669. doi: 10.1016/S0965-9978(03)00102-9
24. Wang, J.-Z.; Ni, H.-G.; and He, J.-Y., “The Application of Automatic Acquisition of Knowledge to Mix Design of Concrete,” Cement and Concrete Research, V. 29, No. 12, 1999, pp. 1875-1880. doi: 10.1016/S0008-8846(99)00152-0
25. Dias, W. P. S., and Pooliyadda, S. P., “Neural Networks for Predicting Properties of Concretes with Admixtures,” Construction and Building Materials, V. 15, No. 7, 2001, pp. 371-379. doi: 10.1016/S0950-0618(01)00006-X
26. Hofbeck, J. A.; Ibrahim, I. O.; and Mattock, A. H., “Shear Transfer in Reinforced Concrete,” ACI Journal Proceedings, V. 66, No. 2, Feb. 1969, pp. 119-128.
27. Mattock, A. H., and Hawkins, N. M., “Shear Transfer in Reinforced Concrete—Recent Research,” PCI Journal, V. 17, No. 2, 1972, pp. 55-75. doi: 10.15554/pcij.03011972.55.75
28. Kahn, L. F., and Mitchell, A. D., “Shear Friction Tests with High-Strength Concrete,” ACI Structural Journal, V. 99, No. 1, Jan.-Feb. 2002, pp. 98-103.
29. Hsu, T. T. C.; Mau, S. T.; and Chen, B., “Theory on Shear Transfer Strength of Reinforced Concrete,” ACI Structural Journal, V. 84, No. 2, Mar.-Apr. 1987, pp. 149-160.
30. Gohnert, M., “Proposed Theory to Determine the Horizontal Shear between Composite Precast and In Situ Concrete,” Cement and Concrete Composites, V. 22, No. 6, 2000, pp. 469-476. doi: 10.1016/S0958-9465(00)00050-0
31. Loov, R. E., and Patnaik, A. K., “Horizontal Shear Strength of Composite Concrete Beams,” PCI Journal, V. 39, No. 1, 1994, pp. 48-69. doi: 10.15554/pcij.01011994.48.69
32. Kahn, L. F., and Slapkus, A., “Interface Shear in High Strength Composite T-Beams,” PCI Journal, V. 49, No. 4, 2004, pp. 102-110. doi: 10.15554/pcij.07012004.102.110
33. Mattock, A. H.; Li, W. K.; and Wang, T. C., “Shear Transfer in Lightweight Reinforced Concrete,” PCI Journal, V. 21, No. 1, 1976, pp. 20-39. doi: 10.15554/pcij.01011976.20.39
34. Shaw, D. M., and Sneed, L. H., “Interface Shear Transfer of Lightweight-Aggregate Concretes Cast at Different Times,” PCI Journal, V. 59, No. 3, 2014, pp. 130-144. doi: 10.15554/pcij.06012014.130.144
35. Harries, K. A.; Zeno, G.; and Shahrooz, B., “Toward an Improved Understanding of Shear-Friction Behavior,” ACI Structural Journal, V. 109, No. 6, Nov.-Dec. 2012, pp. 835-844.
36. Santos, P. M. D., and Júlio, E. N. B. S., “Factors Affecting Bond between New and Old Concrete,” ACI Materials Journal, V. 108, No. 4, July-Aug. 2011, pp. 449-456.
37. Scott, J., “Interface Shear Strength in Lightweight Concrete Bridge Girders,” master’s thesis, Virginia Polytechnic Institute and State University, Blacksburg, VA, 2010, 147 pp.
38. Zeno, G. A., “Use of High-Strength Steel Reinforcement in Shear Friction Applications,” master’s thesis, University of Pittsburgh, Pittsburgh, PA, 2010, 91 pp.
39. Mansur, M. A.; Vinayagam, T.; and Tan, K.-H., “Shear Transfer across a Crack in Reinforced High-Strength Concrete,” Journal of Materials in Civil Engineering, ASCE, V. 20, No. 4, 2008, pp. 294-302. doi: 10.1061/(ASCE)0899-1561(2008)20:4(294)
40. Banta, T. E., “Horizontal Shear Transfer between Ultra High Performance Concrete and Lightweight Concrete,” master’s thesis, Virginia Polytechnic Institute and State University, Blacksburg, VA, 2005, 138 pp.
41. Gohnert, M., “Horizontal Shear Transfer across a Roughened Surface,” Cement and Concrete Composites, V. 25, No. 3, 2003, pp. 379-385. doi: 10.1016/S0958-9465(02)00050-1
42. Valluvan, R.; Kreger, M. E.; and Jirsa, J. O., “Evaluation of ACI 318-95 Shear-Friction Provisions,” ACI Structural Journal, V. 96, No. 4, July-Aug. 1999, pp. 473-481.
43. “MATLAB and Statistics Toolbox Release R2014b,” The MathWorks, Inc., Natick, MA, 2014.
44. Nowak, A. S., “Load Model for Bridge Design Code,” Canadian Journal of Civil Engineering, V. 21, No. 1, 1994, pp. 36-49. doi: 10.1139/l94-004
45. Nowak, A. S.; Park, C.-H.; and Casas, J. R., “Reliability Analysis of Prestressed Concrete Bridge Girders: Comparison of Eurocode, Spanish Norma IAP and AASHTO LRFD,” Structural Safety, V. 23, No. 4, 2001, pp. 331-344. doi: 10.1016/S0167-4730(02)00007-3
46. Nowak, A. S.; Rakoczy, A. M.; and Szeliga, E. K., “Revised Statistical Resistance Models for R/C Structural Components,” Andy Scanlon Symposium on Serviceability and Safety of Concrete Structures: From Research to Practice, SP-284, American Concrete Institute, Farmington Hills, MI, 2012, 16 pp.
47. Nowak, A. S., and Szerszen, M. M., “Bridge Load and Resistance Models,” Engineering Structures, V. 20, No. 11, 1998, pp. 985-990. doi: 10.1016/S0141-0296(97)00193-4
48. Rakoczy, A. M., and Nowak, A. S., “Resistance Model of Lightweight Concrete Members,” ACI Materials Journal, V. 110, No. 1, Jan.-Feb. 2013, pp. 99-108.
49. PCI, PCI Bridge Design Manual, third edition, Precast Prestressed Concrete Institute, Chicago, IL, 2014.