Seismic retrofitting strategies for pre-70 RC buildings: the effectiveness of “local interventions”

Risi, Maria Teresa De; Gaudio, Carlo Del; Scala, Santa Anna; Verderame, Gerardo Mario

doi:10.1016/j.prostr.2023.01.124

Cited by 1 publication

(2 citation statements)

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“…Infilled reinforced concrete (RC) frames are among the most common structural typology in many countries worldwide: they have become popular during the XX century and are still frequently built. The knowledge acquired through post-earthquake field observations [1][2] or experimental and numerical scientific studies [3][4][5][6][7][8][9][10][11][12] has led to progressive improvements in the response of these structures, especially thanks to code prescriptions addressing new construction. However, a large number of existing buildings that were not designed for earthquake resistance are still in use, and are typically affected by severe damage in seismic events (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

“…Despite the well-known deficiencies causing the seismic vulnerability of infilled RC structures, investigations have focused on repair and enhancement techniques only in recent years, thanks to the sharp evolution of the construction material industry and to the increased public awareness about seismic risk mitigation [11][12]. Strengthening techniques have usually been studied through separate experimental investigations to characterize, for example, the enhancement on RC column or beam elements [13][14][15][16][17], RC beam-column joints [18][19], or masonry infills [20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

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Preliminary Results of a Shaking-Table Dynamic Test on a Repaired and Enhanced Reinforced Concrete Infilled Structure

Milanesi,

Guerrini,

Bolognini

et al. 2023

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Although several post-earthquake surveys and previous studies have addressed the seismic vulnerability of infilled reinforced concrete (RC) structures built without proper seismic design, investigations have focused on repair and enhancement techniques only in recent years thanks to the development of new materials and the increase of public awareness. Moreover, experimental investigations have more commonly addressed strengthening techniques of pristine specimens rather than repairing solutions for damaged elements, because of the difficulty in defining a proper level of pre-existing damage. This paper describes an experimental campaign conducted at the EUCENTRE Foundation (Pavia, Italy) and discusses some preliminary results. The research work addresses the effectiveness of repair and strengthening techniques applied to a pair of identical structures through incremental dynamic shake-table tests. The specimens consisted of real scale threestory RC frames with clay masonry infills that were previously damaged up to two different levels to simulate two distinct post-earthquake conditions. The structures were repaired and enhanced depending on the preexisting damage and then subjected to the same loading protocol to allow a direct comparison on the effectiveness of the adopted techniques. The interventions involved the most vulnerable structural and nonstructural elements and can be summarized in: (i) strengthening of the first-story RC columns, (ii) repair and enhancing of first-story RC slab-column joints, and (iii) enhancement of the masonry infills for both in-plane and out-of-plane resistance.

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