Title:
Flat Plate Building and Frame: Full Scale Tests for European Design Provisions
Author(s):
Dario Coronelli, Aurelio Muttoni, Radu Pascu, Antonio Ramos
Publication:
Symposium Paper
Volume:
353
Issue:
Appears on pages(s):
73-96
Keywords:
flat slab; large-scale tests; pseudo-dynamic testing; retrofit
DOI:
10.14359/51737112
Date:
7/1/2022
Abstract:
Current European seismic regulations do not cover the seismic design of flat plate structures (denominated flat slabs in Europe and in the following) The results of full scale testing on a two-story flat-slab frame are intended to contribute to future code developments are reported in the paper. The design of the specimen complied to the general specifications in the European seismic code for secondary elements i.e. non-seismic resistant. An extension of the approach proposed by ACI318 was used to predict the ultimate drift capacity of the connections. A first testing phase subjected the structure to seismic actions simulated by the pseudo-dynamic technique, including numerical models of shear walls. In a second phase, the frame was tested for cyclic loading up to 2.5% global drift ratio firstly, followed by the addition of strengthening, and a second cyclic test was done up to 6% global drift ratio. The results are compared to the state of the art tests regarding reduced and full-scale tests carried out in North America. The research developments aim to further the preparation of new European seismic regulations for flat slabs, by including analytical models to predict the ultimate rotation capacity of the connections as a function of the gravity shear.
Related References:
1. CEN (2004a) EN 1998-1. Eurocode 8: Design of structures for earthquake resistance - Part 1: General rules, seismic actions and rules for buildings
2. Pinto A, Taucer F, Dimova S (2007): Pre-normative research needs to achieve improved design guidelines for seismic protection in the EU. JRC Scientific and Technical Report, EUR 22858 ISSN 1018-5593, European Commission - Joint Research Centre, Ispra, Italy.
3. Fardis MN (2009): Seismic Design, Assessment and Retrofitting of Concrete Buildings based on EN-Eurocode 8, Spinger Science & Business Media.
4. Coronelli D, Muttoni A, Pascu IR, Ramos A (2020) A state of the art of flat‐slab frame tests for gravity and lateral loading. fib Structural Concrete, suco.202000305, Vol.21, 6, p. 2764-2781.
5. Hwang, S.-J., Moehle, J. P. (2000). Vertical and Lateral Laod Tests of Nine-Panel Flat-Plate Frame. ACI Structural Journal, 97, 1, 193-203.
6. Rha, C., Kang, T. H.-K., Shin, M., Yoon, J. B. (2014). Gravity and Lateral Load-Carrying Capacities of Reinforced Concrete Flat Plate Systems. ACI Structural Journal, 111, 4, 753-764.
7. Moehle J. P., Diebold J. W. (1984). Experimental Study of the Seismic Response of a Two-Story of a Flat-Plate Structure. University of California, Berkeley.
8. Kang, T. H.-K. & Wallace, J. W. (2005). Dynamic Response of Flat Plate System with Shear Reinforcement. ACI Structural Journal, 102, 5, 763-773.
9. Fick, D. R., Sozen, M. A., Kreger, M. E. (2017). Response of Full-Scale Three-Story Flat-Plate Test Structure to Cycleas of Increasing Lateral Load. ACI Structural Journal, 114, 6, 1507-1518.
10. Pan A, Moehle JP (1989) Lateral displacement ductility of reinforced concrete flat plates. ACI Struct J 86:250–258. doi: 10.14359/2889
11. ACI Committee 318 (2019) “Building Code Requirements for Structural Concrete (ACI 318-19) and Commentary,” American Concrete Institute (ACI), Farmington Hills, MI.
12. ACI-ASCE 421 (2010) “ACI PRC-421.2-10 Guide to Seismic Design of Punching Shear Reinforcement in Flat Plates” Author: Joint ACI-ASCE Comm 421, 30pp, ISBN: 9780870313745.
13. Ramos A:, Marreiros R., Almeida A., Isufi B., Inácio M. (2017) Punching of flat slabs under reversed horizontal cyclic loading fib Bulletin 81 / ACI SP-315, Punching shear of structural concrete slabs: Honoring Neil M. Hawkins, ACI-fib International Symposium.
14. CEN (2002) Eurocode 1: Action on Structures: Part 1-1: General Actions - Densities, Selfweight, Imposed Loads for Buildings
15. Ministero degli Interni (2018) NTC2018 - Norme Tecniche per le Costruzioni. D.M.17 Gennaio 2018
16. CEN (2004) EN 1992-1-1. Eurocode 2 — Design of concrete structures. Part 1-1: General rules and rules for buildings
17. Pegon P, Molina F, Magonette G (2008) Continuous pseudo-dynamic testing at ELSA. Hybrid simulation; theory, implementation and applications. CRC Press, London
18. Martinelli L (2008): Modeling shear-flexure interaction in reinforced concrete elements subjected to cyclic lateral loading. ACI Structural Journal, 105 (6), 675-684.
19. Bu W, Polak MA (2009): Seismic retrofit of reinforced concrete slab-column connections using shear bolts. ACI Structural Journal. 106 (4), 514.
20. Ruiz MF, Muttoni A, Kunz J. Strengthening of flat slabs against punching shear using post installed shear reinforcement. ACI Struct J 2010;107:434–42.
21. Almeida AFO, Ramos AP, Lúcio V, Marreiros R. Behavior of RC flat slabs with shear bolts under reversed horizontal cyclic loading. Struct Concr 2020;21:501–16. doi:10.1002/suco.201900128.
22. Drakatos IS, Muttoni A, Beyer K (2018) Mechanical model for drift-induced punching of slab-column connections without transverse reinforcement. ACI Struct J 115:463–474. doi: 10.14359/51701110
23. Muttoni A, Fernández Ruiz M, Simões JT (2018) The theoretical principles of the critical shear crack theory for punching shear failures and derivation of consistent closed-form design expressions. Struct Concr 19:174–190. doi: 10.1002/suco.201700088