2017 - 2020
Dario Coronelli
ELSA Staff
2017 - 2020
Slab STructural RESponse for Seismic European Design
SERA-SlabSTRESS
Dataset Description
The dataset reports results from the full-scale testing of a two-storey flat slab structure, undertaken in the SlabSTRESS research project. The construction and testing were planned and carried out at the ELSA laboratory of the European Commission’s Joint Research Centre.
The dimensions are three bays by two, spans 4.5 and 5 m, slab thickness 0.2 m, interstorey height 3.2 m. Two different longitudinal reinforcement details were considered; welded studs shear reinforcement was provided only in the second floor slab.
The testing program included seismic tests for service and ultimate actions, using the pseudo-dynamic technique with virtual walls. To this aim, a building structure was designed with primary walls and the flat slab frame as secondary element. Cyclic loading tests followed up to ultimate drift capacity of the structure. The sequence of tests included strengthening of a set of damaged connections using bolted bars in holes drilled through the slab, followed by cyclic testing to failure.
The instrumentation was provided for the global response and the connections with local rotations in the columns and slab. Cracking around the columns was measured with through-crack sensors. A measurement system for internal forces and moments was included within the columns.
The results show the response with deformations and damage for the different loading conditions up to failure. The results obtained on a full-scale structure extend and confirm the knowledge in the literature, mainly based on isolated connections and/or small-scale samples.
Specimens
1. "As built" building
2
The structure is a two-floor flat slab frame, with three by two bays (4.5 m and 5 m in the longitudinal direction and 4.5 m in the transverse direction) and storey height equal to 3.2 m. The floors are ordinary reinforced concrete slabs 0.2 m thick. Columns cross sections are square with dimensions 0.4, 0.35 and 0.3 m for internal, edge and corner columns respectively.
The seismic design of the structure was carried out as a secondary flat slab frame in a building with primary seismic resistant walls. These latter have been numerical simulated and included in the pseudo-dynamic testing through sub-structuring.
The aim of the SlabSTRESS experimental campaign was twofold: first to verify the seismic performance of a structure designed according to Eurocode, with ductile walls and flat slab frames as primary and secondary seismic members respectively, and secondly to study the performance of the flat slab frame beyond the design displacements.
1. Pseudo-Dynamic (PsD) test
Pseudo-dynamic tests were performed first on the specimen treated as part of a building with two numerical shear walls to study its seismic performance at the Serviceability (SEIS-SLS) and Ultimate Limit States (SEIS-ULS). Test SEIS-ULS aimed to verify the requirement of Eurocode 8 that the flat slab frame maintains the capacity to bear gravity loads when subjected to the maximum deformations reached for the seismic design action.
Instrumentation
The horizontal displacements/loads on each floor was imposed by two parallel hydraulic actuators connected to the laboratory reaction wall. Each jack had a stroke of ± 500 mm and a working load of ± 500 kN.
In addition to the self-weight of the flat slab frame, water tanks and concrete blocks were placed on the first and second floor to impose vertical loads reproducing distributed loads.
The instrumentation, common to all experiments, monitored the global response of the specimen (i.e. longitudinal and transversal displacement at the two storeys) as well as the behaviour of connections. The latter included transducers for local rotations of the columns and slab, and opening of cracks in columns.
Finally the instrumentation included a novel measurement system for internal forces and moments within the columns.
2. Pseudo-Static cyclic test
Quasi-static tests were subsequently performed on the specimen – without the numerical shear walls – subjected to cyclic loading with increasing displacements. The test sequence was planned to achieve a progressive and controlled damage of slab-column connections. Test CYC-1 aimed at studying the cyclic response of the flat slab frame until punching shear failure was observed at the first floor.
Instrumentation
The instrumentation employed was identical to that used for the pseudo-dymic tests on the specimen.
2. Retrofitted building
1
The cyclic test CYC-1 damaged slab-column connections at the first floor, where no transversal reinforcement was originally placed. Following this test, some of the slab-column connections were strengthened improving the punching-shear resistance, before the cyclic test CYC-2. This operation represents a realistic scenario, in which retrofitting is carried out after a major seismic event. The partial retrofit allowed a direct comparison among the response of unreinforced connections, and those with post-installed and pre-installed shear reinforcement.
1. Pseudo-Static cyclic test
Test CYC-2 was performed after a set of the slab-column connections of the first floor were strengthened.
Instrumentation
The instrumentation employed was identical to that used for the tests on the specimen in the "as built" configuration.
Publications- DOIs
Publication/Data Paper DOIs
Coronelli, D., Lamperti Tornaghi, M., Martinelli, L., Molina, F.-J., Muttoni, A., Pascu, I. R., Pegon, P., Peroni, M., Ramos, A. P., Tsionis, G., & Netti, T. (2021). Testing of a full-scale flat slab building for gravity and lateral loads. Engineering Structures, 243, 112551. https://doi.org/10.1016/j.engstruct.2021.112551
Ramos, A. P., Isufi, B., Marreiros, R., Coronelli, D., Netti, T., Lamperti Tornaghi, M., Tsionis, G., & Muttoni, A. (2022). Seismic Performance of Strengthened Slab-Column Connections in a Full-Scale Test. Journal of Earthquake Engineering, 27(9), 2299–2318. https://doi.org/10.1080/13632469.2022.2112320
Coronelli, D., Muttoni, A., Pascu, I. R., Ramos, A. P., & Netti, T. (2020). A state of the art of flat‐slab frame tests for gravity and lateral loading. Structural Concrete, 21(6), 2764–2781. https://doi.org/10.1002/suco.202000305
Dataset in Public Repository
DOI
10.5281/zenodo.11058094
Publication Date
14 May 2024, 07:14
Project Metadata
Rights
Creative Commons Attribution 4.0 International.
CC BY 4.0
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