Seismic behavior of interior connections in existing waffle-flat-plate structures

Benavent‐Climent, Amadeo; Cahís, X.; Catalan, A.

doi:10.1016/j.engstruct.2008.02.004

Cited by 13 publications

(10 citation statements)

References 8 publications

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“…Since the first reference to seismic actions was made in a code, MV-101 (1962); four seismic codes have been released in Spain. Spanish codes released since 1962 can be classified in two groups: "old codes" PGS-1 (1968) and PDS-1 (1974) and "new codes" NCSR-94 (1994) and NCSE-02 (2002 (Benavent-Climent, 2007;Benavent-Climent et al, 2008;Vielma et al, 2010). Very few structures are characterized by frame in both principal directions.…”

Section: Common Design Practice For Rc Building In Lorcamentioning

confidence: 99%

The structural role played by masonry infills on RC building performances after the 2011 Lorca, Spain, earthquake

Luca

Verderame

Gómez-Martínez

et al. 2013

Bull Earthquake Eng

137

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On May 11, 2011 an earthquake of magnitude 5.1 ( TeX ) struck Murcia region causing nine casualties and damage to buildings and infrastructures. Even if the main characteristics of the event would classify it as a moderate earthquake, the maximum Peak Ground Acceleration (PGA) registered (equal to 0.37 g) exceeded significantly local code provisions in terms of hazard at the site. This high PGA was a result of directivity effects in the near source region. An overview of earthquake characteristics and damage observed is provided. Notwithstanding the lack of proper structural design characterizing building stock in the area, most of the losses were caused by non-structural damage. According to in field observations, it emerges that masonry infills provided additional, “not designed”, strength to reinforced concrete (RC) buildings. Observed damage data, collected after the earthquake, are shown and compared to the results of a simplified approach for nonstructural damage assessment of RC infilled structures (FAST vulnerability approach). The latter comparison provided a fair accordance between observed data and analytical results

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Section: Common Design Practice For Rc Building In Lorcamentioning

confidence: 99%

The structural role played by masonry infills on RC building performances after the 2011 Lorca, Spain, earthquake

Luca

Verderame

Gómez-Martínez

et al. 2013

Bull Earthquake Eng

137

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“…Drakatos et al (2016) tested internal slab-column connections in full scale under monotonic and cyclic imposed rotations, investigating the drift capacity for different types of loading, gravity shear ratios and reinforcement ratios. Interior and exterior waffle flat slab-column connections under lateral loading have been studied in Spain under cyclic loading (Benavent-Climent et al 2008 as well as through shake table tests of a half scale one bay floor (Benavent-Climent et al 2016;Benavent-Climent et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Deformation capacity evaluation for flat slab seismic design

Muttoni

Coronelli

Tornaghi

et al. 2022

Bull Earthquake Eng

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In flat-slab frames, which are typically designed as secondary seismic structures, the shear failure of the slab around the column (punching failure) is typically the governing failure mode which limits the deformation capacity and can potentially lead to a progressive collapse of the structure. Existing rules to predict the capacity of flat slab frames to resist imposed lateral displacements without losing the capability to bear gravity loads have been derived empirically from the results of cyclic tests on thin members. These rules account explicitly only for the ratio between acting gravity loads and resistance against concentric punching shear (so-called Gravity Shear Ratio). Recent rational models to estimate the deformation capacity of flat slabs show that other parameters can play a major role and predict a significant size effect (reduced deformation for thick slabs). In this paper, a closed-form expression to predict the deformation capacity of internal slab-column connections as a function of the main parameters is derived from the same model that has been used to develop the punching shear formulae for the second generation of Eurocode 2 for concrete structures. This expression is compared to an existing database of isolated internal slab-column connections showing fine accuracy and allowing to resolve the shortcomings of existing rules. In addition, the results of a testing programme on a full-scale flat-slab frame with two stories and 12 columns are described. The differences between measured interstorey drifts and local slab rotations influencing their capacity to resist shear forces are presented and discussed. With respect to the observed deformation capacities, similar values are obtained as in the isolated specimens and the predictions are confirmed for the internal columns, but significant differences are observed between internal, edge and corner slab-column connections. The effects of punching shear reinforcement and of integrity reinforcement (required according to Eurocode 2 to prevent progressive collapse after punching) are also discussed.

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“…Since the location of zero points is load-dependent, a compromise was reached by adopting a length between one half and one fifth of the span, avoiding the D-region close to the joint and adjusting the ends of the specimen so that the jacks could be attached to ground. Some authors [19,22,47] also consider gravity loads in their experiments, but no reference is made to this fact in the geometry of the specimens. Although this is not a major point, the authors are unaware of any information on this matter in the literature.…”

Section: Geometrymentioning

confidence: 99%

Experimental tests on retrofitted RC beam-column joints underdesigned to seismic loads. General approach

Ruiz-Pinilla¹,

Pallarés²,

Giménez³

et al. 2014

Engineering Structures

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Seismic behavior of interior connections in existing waffle-flat-plate structures

Cited by 13 publications

References 8 publications

The structural role played by masonry infills on RC building performances after the 2011 Lorca, Spain, earthquake

The structural role played by masonry infills on RC building performances after the 2011 Lorca, Spain, earthquake

Deformation capacity evaluation for flat slab seismic design

Experimental tests on retrofitted RC beam-column joints underdesigned to seismic loads. General approach

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