Design of dissipative and elastic high-strength exoskeleton solutions for sustainable seismic upgrades of existing RC buildings

Passoni, Chiara; Guo, Jack Wen Wei; Christopoulos, Constantin; Marini, Alessandra; Riva, Paolo

doi:10.1016/j.engstruct.2020.111057

Cited by 31 publications

(17 citation statements)

References 30 publications

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“…In this paper, focus is made on a retrofit placed on the outside of the building, such as those implementing exoskeletons, which are aimed at minimizing the barriers to the renovation (Marini et al 2017) and where the need of either floor strengthening or the construction of brand-new diaphragms inside the building would jeopardize the feasibility of the solution. In the conceptual design of the structural exoskeleton, two main typologies could be adopted: the shear wall and the shell solutions (Marini et al 2017;Passoni et al 2020). Considering the shear wall exoskeleton, a limited number of external walls are added to the existing building.…”

Section: Tied-arch Mechanism In Floor Diaphragmsmentioning

confidence: 99%

“…In fact, although these systems do not seem critical for the capacity of the existing structures, which are often affected by vulnerabilities associated with the LFRS vertical elements, they may become critical when an additional stiff LFRS is provided to the structure. This issue is particularly relevant when retrofit interventions are applied from the outside of the building by means of structural exoskeletons, suitable to avoid inhabitants' relocation and building downtime (Marini et al 2017;Passoni et al 2020). In this case, in fact, it is impossible to increase the in-plane floor capacity with traditional strengthening measures, i.e.…”

Section: Introductionmentioning

confidence: 99%

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In-plane capacity of existing post-WWII beam-and-clay block floor systems

Marini

Belleri

Passoni

et al. 2022

Bull Earthquake Eng

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A growing attention has been paid to the deep renovation of RC buildings, particularly focusing on their structural vulnerability and on the development of retrofit strategies; however, the issue of the in-plane diaphragm action and the capacity of existing floors has rarely been addressed. Although floor capacity does not seem critical for the seismic capacity of existing structures, commonly affected by greater vulnerabilities, it may become critical when an additional lateral force resisting system is introduced. This paper investigates the in-plane capacity of beam and hollow-clay-block floor system, typical of the European post-WWII RC buildings. Considering the diaphragm action as associated with an in-plane tied-arch mechanism developing within the floor thickness, the main failure mechanisms are discussed, and some simplified equations are provided to preliminary estimate the maximum capacity of floors. Experimental and numerical analyses are than carried out to validate the simplified analytical model. The relevant influence of possible staircase openings on the in-plane load paths and on diaphragm flexibility and capacity are also considered. Finally, the influence of the floor capacity on the seismic vulnerability assessment and in the conceptual design of a seismic retrofit intervention is discussed. This preliminary study shows that only some of the beam-and-block floor systems have a reliable in-plane capacity, while other typologies cannot serve as floor diaphragms. When the diaphragm action can be relied upon, the diaphragms often exhibit a fairly stiff behaviour up to a brittle failure, which is commonly associated with the ultimate capacity at the tied-arch supports.

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Section: Tied-arch Mechanism In Floor Diaphragmsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In-plane capacity of existing post-WWII beam-and-clay block floor systems

Marini

Belleri

Passoni

et al. 2022

Bull Earthquake Eng

Self Cite

View full text Add to dashboard Cite

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“…On the other hand, some research projects implementing CLT panels for the retrofit of existing buildings were developed [18][19][20], but without solving in a comprehensive manner all the correlated structural, energy, and technological issues and without addressing LCT principles. Finally, exoskeleton techniques for the holistic renovation of existing buildings considering different technologies have recently been proposed [21][22][23][24][25] but these are only at a conceptual level, with the sole exception of the first pioneering intervention developed by the authors of [26].…”

Section: Adesa System: An Anti-seismic Eco-efficient Wooden Shellmentioning

confidence: 99%

Integrated Deep Renovation of Existing Buildings with Prefabricated Shell Exoskeleton

et al. 2021

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The European goal to reach carbon neutrality in 2050 has further put the focus on the construction sector, which is responsible for great impacts on the environment, and new sustainable solutions to renovate the existing building stock are currently under development. In this paper, the AdESA (Adeguamento Energetico Sismico ed Architettonico, in Italian) system, a holistic retrofit technique for the integrated renovation of the existing buildings, is presented. The system was developed by a consortium of enterprises and universities and was applied to a pilot building. The system consists of a dry, modular and flexible shell exoskeleton technique that implements different layers depending on the building retrofit needs (cross-laminated timber (CLT) panels for the structural retrofit, thermal insulation panels for the energy efficiency amelioration, and claddings for the architectural restyling). In order to foster actual sustainability, the solution contextually targets eco-efficiency, safety and resilience. To this end, the system not only couples the structural and energy interventions to reduce the operating costs, but it is also conceived in compliance with life cycle thinking (LCT) principles to reduce impacts throughout the remaining building service life (from retrofit time to the end of its life). The system is designed to be easily mountable and demountable to allow for the reuse/recycling of its components at the end of life by adopting macro-prefabricated dry components and standardized connections, to reduce damage caused by earthquakes by reducing the allowed inter-story drift, and by amassing the possible damage into sacrificial replaceable elements. The paper describes the AdESA system from a multidisciplinary perspective and its effective application for the deep renovation of an existing gymnasium hall.

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“…This aspect increases the sustainability of the intervention in terms of life cycle assessment, providing easier management of the construction at its end of life. Seismic performance and design procedures for exoskeleton structures have been studied by Reggio et al [42], Labò et al [43], and Passoni et al [44].…”

Section: Integrated Retrofitting Solutions For Existing Buildingsmentioning

confidence: 99%

Seismic and Energy Integrated Retrofitting of Existing Buildings with an Innovative ICF-Based System: Design Principles and Case Studies

et al. 2021

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This work proposes an innovative integrated retrofitting system aiming to improve both the seismic and energy performance of existing reinforced concrete and masonry buildings. The system is based on engineered insulating concrete form panels, installed on the outside of existing buildings as a shell exoskeleton. A key major advantage of the proposed system is that it addresses the contemporary improvement of seismic and energy performances of existing buildings in a single installation stage, operating exclusively from outside of the building. The insulating formworks are ad hoc prefabricated in a factory on the base of the specific geometry of the existing buildings so as to greatly maximize the ratio between overall retrofitting benefits and costs and at the same time to simplify the installation procedures. The objectives of the presented research are, on one hand, to highlight the major structural issues that the system aims to address, and on the other hand to illustrate the main characteristics and combined benefits of the proposed retrofitting system. From a structural point of view, the proposed system is conceived to behave as a non-dissipative structure with regard to seismic actions, and the lateral strength and stiffness of the structural elements are designed accordingly. An analytical design approach is proposed and validated using the available data from an experimental test performed on a full-scale simple building. Moreover, numerical modeling strategies for the proposed system are illustrated for two complex case study buildings. The results of the analyses show a considerable increase in lateral stiffness of the retrofitted buildings that, considering the non-dissipative behavior of the elements, leads to a relevant reduction of seismic deformation demand on existing structural elements.

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Design of dissipative and elastic high-strength exoskeleton solutions for sustainable seismic upgrades of existing RC buildings

Cited by 31 publications

References 30 publications

In-plane capacity of existing post-WWII beam-and-clay block floor systems

In-plane capacity of existing post-WWII beam-and-clay block floor systems

Integrated Deep Renovation of Existing Buildings with Prefabricated Shell Exoskeleton

Seismic and Energy Integrated Retrofitting of Existing Buildings with an Innovative ICF-Based System: Design Principles and Case Studies

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