Nonlinear Modeling Approaches for Existing Reinforced Concrete Buildings: The Case Study of De Gasperi-Battaglia School Building in Norcia

Lima, Carmine; Angiolilli, Michele; Barbagallo, Francesco; Belletti, Beatrice; Bergami, Alessandro Vittorio; Camata, Guido; Cantagallo, Cristina; Domenico, Mariano Di; Fiorentino, Gabriele; Ghersi, Aurelio; Gregori, Amedeo; Lavorato, Davide; Marino, Edoardo M.; Martinelli, Enzo; Nuti, Camillo; Ricci, Paolo; Rosati, Luciano; Ruggieri, Sergio; Sessa, Salvatore; Spacone, Enrico; Terrenzi, Marco; Uva, Giuseppina; Vecchi, Francesca De; Verderame, Gerardo Mario

doi:10.1007/978-3-030-23748-6_7

Cited by 11 publications

(4 citation statements)

References 13 publications

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“…Concrete01 has compressive strength fc = 28 MPa, strain at maximum strength εc0 = 2.5‰ and ultimate strain εcu = 3.5‰. The fiber section model accounts for the N-M-M interaction [47,48] that becomes important when the columns are subjected to biaxial bending as in the case of the present study. As indicated in Figure 1, Str2 is identical to Str1, except for the center of mass (CM) that in Str2 has eccentricities equal to e x = 15% L and e y = 15% B in the X and Y directions, respectively.…”

Section: Structural Modelsmentioning

confidence: 99%

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Effects of Multi-Directional Seismic Input on Non-Linear Static Analysis of Existing Reinforced Concrete Structures

et al. 2023

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Recent studies have shown the importance of including the seismic input directionality in nonlinear analyses for an accurate prediction of the structural demand on frame structures. This paper proposes a new method that includes the multi-directionality of the input seismic forces in Nonlinear Static Analyses (NSAs). Conventionally, the pushover (PO) analyses apply monotonically increasing lateral loads in two directions that typically correspond with the building X and Y directions, that in the case of a rectangular plan are parallel to the building sides. Since in general the direction of the seismic input is a priori unknown, the effects of applying the PO load patterns along varying angles are studied in this paper. Two non-code-conforming reinforced concrete buildings are used as a case study. They have identical structural design but the first one is doubly symmetric while the second one has a significant plan asymmetry due to the translation of the center of mass. PO loads are applied to both structures at angles between 0° and 360° with 15° increments. The results of the NSAs are compared with those of multi-directional NHAs applied at the same angles. The structural demands show that the multi-directional NSAs are more conservative than the conventional NSAs, especially at the corners of the asymmetric- plan building where they can yield significantly higher demands. The base shear capacities in the X and Y directions decrease for intermediate angles due to the interaction between the responses in the X and Y directions that can be captured thanks to the columns’ fiber section discretization. On average the results of the multi-directional NSAs are closer to those of the NHAs, even though they are generally lower.

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Section: Structural Modelsmentioning

confidence: 99%

Section: Structural Modelsmentioning

confidence: 99%

Effects of Multi-Directional Seismic Input on Non-Linear Static Analysis of Existing Reinforced Concrete Structures

et al. 2023

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“…The floor slabs are modeled as rigid diaphragms, by constraining the nodes belonging to the same floor to have the same displacement. As highlighted e.g., in references [27], [52], the interaction between beam elements modeled with fiber sections and the rigid diaphragm may distort the response of the structure, overestimating the moment resistance of the beams. Under the effect of the seismic action, concrete elements tend to crack and because of that, the neutral axis of the RC cross-section undergoes a shift.…”

Section: Periodmentioning

confidence: 99%

“…To the Authors' knowledge, a comparative evaluation of concentrated plasticity models for non-linear dynamic analyses of RC structures has not been conducted yet, and the choice is ultimately left to the structural engineer. However, not negligible differences exist among the various formulations, which can lead to inconsistent approaches and possibly conflicting results, see e.g., references [26], [27].…”

Section: Introductionmentioning

confidence: 99%