Reinforced Concrete Exterior Waffle Flat Plate-Column Connections Subjected to Lateral Earthquake Loading

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

doi:10.1080/13632460802598453

Cited by 9 publications

(6 citation statements)

References 7 publications

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“…To this end, first, a model for representing the moment transfer mechanism between plate and columns in exterior connections is presented. The model is an extension of a former one proposed by the authors that was validated with static tests. Second, the consistency of the proposed model with the results of the shake table tests is demonstrated.…”

Section: Design Implicationsmentioning

confidence: 99%

Shaking table tests of a reinforced concrete waffle–flat plate structure designed following modern codes: seismic performance and damage evaluation

Benavent‐Climent

Donaire-Ávila

Oliver-Saiz

2015

Earthq Engng Struct Dyn

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Summary Shaking table tests were conducted on a scaled reinforced concrete waffle–flat plate structure. It represented a conventional construction design under current building codes in the Mediterranean area. The test structure was subjected to a sequence of four seismic simulations of increasing magnitude. Each simulation was associated with a seismic hazard level characterized by the mean return period PR. The test structure performed well for the simulations associated with PR = 95, 475 and 975 years but collapsed under the maximum considered earthquake of PR = 2475 years. Damage concentrated at column bases, where the maximum chord rotation reached 93% of the ultimate capacity, and at the transverse beams of the exterior plate‐to‐column connection that failed in torsion. It is shown that most (from 85% to 90%) of the energy input by the earthquake that contributes to damage is dissipated by the plate. The capacity curve of the tested structure estimated from the experimental base shear vs. top displacement relationship allowed us to compute the overstrength (1.4). It is close to the maximum established by European code EN 1998‐1 (1.5). Based on a detailed study of the test results, potential updates to current codes and design recommendations are suggested. Copyright © 2015 John Wiley & Sons, Ltd.

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Section: Design Implicationsmentioning

confidence: 99%

Shaking table tests of a reinforced concrete waffle–flat plate structure designed following modern codes: seismic performance and damage evaluation

Benavent‐Climent

Donaire-Ávila

Oliver-Saiz

2015

Earthq Engng Struct Dyn

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“…For exterior column‐plate connections, the solid slab is divided into 3 “virtual” independent beams in the direction of the seismic loading, following the model proposed by Benavent et al One beam (central beam) is centered on the axis of the column, and the other 2 beams (exterior beams) are located at either side of the central beam. The width b of the central beam is taken to be equal to 2 b L + c 2 , where c 2 is the transverse dimension of the column and b L is the length on each side of the column, where the longitudinal rebars of the plate in the direction of the seismic loading transmit the stress directly to the column through a strut‐and‐tie mechanism; it is calculated as explained in Benavent‐Climent et al The exterior beams transmit the moments from the plate to the columns through torsion on the spandrel beams, having width 0.5[ b s ‐(2 b L + c 2 )], where b s is the total width of the solid zone measured perpendicularly to the seismic loading. Therefore, these “virtual” beams are considered separately as frame elements to calculate the dissipated energy according to the procedure explained above.…”

Section: Test Results and Interpretationmentioning

confidence: 99%

Seismic performance and damage evaluation of a waffle‐flat plate structure with hysteretic dampers through shake‐table tests

Benavent‐Climent

Donaire-Ávila

Oliver-Saiz

2018

Earthq Engng Struct Dyn

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Summary Reinforced concrete waffle‐flat plate (WFP) structures present 2 important drawbacks for use as a main seismic resisting system: low lateral stiffness and limited ductility. Yet the former can serve a positive purpose when, in parallel, the flexible WFP structure is combined with a stiff system lending high‐energy dissipation capacity, to form a “flexible‐stiff mixed structure.” This paper experimentally investigates the seismic performance of WFP structures (flexible system) equipped with hysteretic dampers (stiff system) through shake‐table tests conducted on a 2/5‐scale test specimen. The WFP structure was designed only for gravitational loads. The lateral strength and stiffness provided by the dampers at each story were, respectively, about 3 and 7 times greater than those of the bare WFP structure. The mixed system was subjected to a sequence of seismic simulations representing frequent to very rare ground motions. Under the seismic simulations associated with earthquakes having return periods ranging from 93 to 1894 years, the WFP structure performed in the level of “immediate occupancy,” with maximum interstory drifts up to about 1%. The dampers dissipated most (75%) of the energy input by the earthquake.

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“…Introduction 47 systems (Benavent-Climent et al, 2016;Benavent-Climent et al, 2018) under unidirectional seismic loading, as well as, the performance of structural sub-elements under pseudo-statics loadings such as slab-columns connections (Benavent-Climent, A, Cahís, & Catalán, 2008;Benavent-Climent, A, Cahis, & Catalan, 2009). One of the main goals of this Thesis is to investigate the response of a WFP system subjected to bidirectional seismic loading.…”

Section: Aims and Objectivesmentioning

confidence: 99%

“…However, it is also true that the method is very dependent on the fraction of the total unbalanced moment ( ), which controls the contribution of shear and flexure to endure the unbalanced moment. Benavent-Climent et al (2009) analyzed the influence of this factor as well the ACI's capacity moment prediction for an exterior waffle-flat-plate-column connection, concluding that the code does not adequately predict the moment transfer capacity of the connection in regards to their results. In addition, they proposed a new method that holds that the moment is transferred from the plate to the column over two load paths.…”

Section: Exterior Drop Panelmentioning

confidence: 99%

“…The first path rely both on the plate longitudinal reinforcement anchored directly in the column width , and on the plate's longitudinal reinforcement passing outside the column and located within a distance that is able to transfer the load through the formation of a strut-and-tie mechanism. In the second path, the moment is transferred from the plate longitudinal reinforcement outside the to the column through torsion in the transverse beam (Benavent-Climent, Donaire-Avila, & Oliver-Saiz, 2016;Benavent-Climent et al, 2009).…”

Section: Exterior Drop Panelmentioning

confidence: 99%

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Comportamiento sísmico de estructuras con forjados reticulares y disipadores de energía bajo acción simultánea de dos componentes horizontales del terremoto

Lamuela¹

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This Thesis investigates the seismic behavior of reinforced concrete structures consisting of waffle-flat plates supported on isolated columns, without and with hysteretic dampers, subjected to the simultaneous action of two components of the ground motion caused by an earthquake. The methodology applied involves two approaches: the experimental approach (dynamic shaking table tests), and the numerical approach (nonlinear response history analyses with a refined 3D finite element model). The study addresses the response of the structure from the initial elastic stages until collapse. Different parameters are used to characterize the seismic action and to evaluate the response and particular attention is given to the energy.Within the experimental approach, a prototype structure with waffle-flat plates and square columns was first designed following the Spanish structural codes. The structure was assumed to be located in Granada. A portion of this prototype was selected, scaled and built in the Laboratory of Structures of the University of Granada (test specimen). The specimen was tested with a biaxial shaking table using the horizontal components of a far field ground motion. These two components were applied simultaneously, scaled in amplitude to increasing values, until collapse. The analyses of the results allowed to describe in detail the evolution of the response in terms of drifts, rotations in column, forces, local deformations and energy that contributes to damage. Damage concentrated at column bases and at the exterior plate-column connection. The energy input in the structure until collapse under the biaxial seismic action was found very close to that obtained in past tests conducted with a similar specimen subjected to unidirectional seismic loadings. Further, based on the results of the tests, it is proposed to adopt the value = 2 as spectrum reduction factor in force-based seismic design methods.The numerical approach had two parts. The first part consisted on developing a refined 3D finite element model that represented the specimen tested with the shaking table. The model was calibrated with the experimental results to obtain a satisfactory fit between tests results and numerical prediction in terms of displacements and energies. This model was used to conduct a parametric study consisting on nonlinear response history analyses with a large set of ground motions. As a result, the ultimate energy dissipation capacity of this type of structures was evaluated, under uniaxial and under biaxial seismic loadings. In the second part of the numerical study, the model was equipped with displacement-dependent (hysteretic) dampers. A second parametric study was conducted with the new model to evaluate the response and the ultimate energy dissipation capacity of the mixed system. As a global result of the numerical approach, it is concluded that the ultimate energy dissipation capacity of the structure (without or with hysteretic dampers) is a relatively stable amount, scarcely influenced by the characteristic...

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Reinforced Concrete Exterior Waffle Flat Plate-Column Connections Subjected to Lateral Earthquake Loading

Cited by 9 publications

References 7 publications

Shaking table tests of a reinforced concrete waffle–flat plate structure designed following modern codes: seismic performance and damage evaluation

Shaking table tests of a reinforced concrete waffle–flat plate structure designed following modern codes: seismic performance and damage evaluation

Seismic performance and damage evaluation of a waffle‐flat plate structure with hysteretic dampers through shake‐table tests

Comportamiento sísmico de estructuras con forjados reticulares y disipadores de energía bajo acción simultánea de dos componentes horizontales del terremoto

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