Seismic Reinforcement of a R.C. School Structure with Strength Irregularities throughout External Bracing Walls

Sassu, Mauro; Puppio, Mario Lucio; Mannari, Eleonora

doi:10.3390/buildings7030058

Cited by 13 publications

(8 citation statements)

References 24 publications

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“…The flexible diaphragms are noticeable in the evaluation of the effects of material variability as shown in the introduction. The flexibility of the slab has a relevant role (Sassu et al, 2017), modifying the actions on elements characterized by different resistance and stiffness: i.e., in most cases rigid slab can maximise the actions on the bearing elements far from the centre of stiffness. The beams are modelled as elastic frames, neglecting their ductile capacity.…”

Section: Analysis and Numerical Modelsmentioning

confidence: 99%

Structural irregularity: The analysis of two reinforced concrete (r.c.) buildings

Puppio¹,

Giresini²,

Doveri³

et al. 2019

10.5267/j.esm

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Structural irregularity is a crucial issue in assessing seismic vulnerability of both new and existing buildings. European technical codes provide simple criteria to define irregularities in plan and in elevation, amplifying the seismic actions and/or introducing torsional effects. Nevertheless, this approach only considers geometrical irregularity. For existing buildings, another source of irregularity comes from the non-uniform distribution of the material strength. In particular, for existing reinforced concrete (r.c.) structures, it is possible to detect significant spread of the concrete compressive strength not only from different structural elements but also from different parts of the same member. In this work, non-linear static analysis is performed on two case-studies of r.c. buildings characterized by geometrical and mechanical irregularity. The resistance of each column is determined with an extensive experimental campaign with in situ and laboratory test (about 600 in situ tests). The results are analyzed considering both local and global effects in terms of resistance of the single elements and of the entire buildings. In this sense, shear and bending failure mechanism are taken into account. The effect of storey flexibility is also considered in the models. Fragility curves are calculated for the buildings with random distribution of the compressive strength of the columns. The results are then compared with the approaches proposed by the Eurocodes evaluating in the standard approach proposed by technical codes is conservative or not.

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Section: Analysis and Numerical Modelsmentioning

confidence: 99%

Structural irregularity: The analysis of two reinforced concrete (r.c.) buildings

Puppio¹,

Giresini²,

Doveri³

et al. 2019

10.5267/j.esm

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“…A relevant intervention should consider mechanical irregularity, particularly the high dispersion in concrete resistance [6]. The design of a new external bracing structure can satisfy this requirement [7]. Another critical issue is the respect of different aspects covered by technical norms, such as energy efficiency [8], fire protection [9] or the use of isolation systems.…”

Section: External Retrofit With Bracing Systemsmentioning

confidence: 99%

Parametric analysis on external dissipative link system for seismic protection of low rise r.c. buildings

Puppio

Ferrini

2019

Frattura Ed Integrità Strutturale

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The seismic rehabilitation of existing R.C. and masonry buildings is a topical issue in Civil Engineering. A useful technique consists in the introduction of the external bracing system. This kind of intervention can be improved through the introduction of dissipative links, investigated here with the help of some examples. The links are made of common steel profiles: length, geometry and positioning are considered as design parameters. A general procedure of link-bracing optimization is proposed by applying a set of identical external restraints. The adopted dissipative links allow a cheaper and more effective design both in terms of ULS and of DLS: the damages are addressed in a small area allowing easy replacement of the links in case of an earthquake.

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“…Structural design optimization can either be founded on cost apart from weight such as applicable in structural retrofitting. Reinforced concrete structures optimization under seismic loads were investigated by [27] and [28]. Plummeting the vibration and enhancing the dynamic structural characteristics of reinforced concrete structures using optimization algorithms methods should command study attention [29].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Doubly Reinforced Beam Design Using Simulated Annealing

Olawale¹,

Akintunde²,

Afolabi³

et al. 2020

JESR

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The optimization of the doubly reinforced concrete beam was investigated in this paper using the simulated annealing. Materials costs are considered as the objective function. The variables are the width, depth, compression steel, tension steel and cost. The constraints are the ultimate moment of resistance, compression/tension-steel ratio, minimum and maximum area of reinforcements. At the concrete compressive strength of 25 MPa, it is demonstrated that simulated annealing method can be used to optimize the design of concrete beams.

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Seismic Reinforcement of a R.C. School Structure with Strength Irregularities throughout External Bracing Walls

Cited by 13 publications

References 24 publications

Structural irregularity: The analysis of two reinforced concrete (r.c.) buildings

Structural irregularity: The analysis of two reinforced concrete (r.c.) buildings

Parametric analysis on external dissipative link system for seismic protection of low rise r.c. buildings

Optimization of Doubly Reinforced Beam Design Using Simulated Annealing

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