Prefabricated Responsive Diagrids for Holistic Renovation of Existing Mid-Rise Rc Buildings

Labò, Simone; Passoni, Chiara; Marini, Alessandra; Belleri, Andrea; Camata, Guido; Riva, Paolo; Spacone, Enrico

doi:10.7712/120117.5719.18007

Cited by 11 publications

(9 citation statements)

References 14 publications

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“…Labò et al [40,41] analyzed various external retrofitting solutions and proposed a new holistic approach for the structural design procedure. The proposed approach aimed to solve architectural, energy, and structural deficiencies of buildings whilst targeting resilience, safety, and sustainability.…”

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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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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“…The stiffness of each member (column or girder) is assumed as k=EJ/L. So, the hinged wall moment of inertia can be obtained from the former definition of the ratio α (1); then, the ratio between the wall dimensions is assumed herein as b=0.15h and the height of the wall section is calculated (3). The dimensions of the hinged walls for the four frames are summarized in Table 4.…”

Section: Design Of the Retrofit Interventionmentioning

confidence: 99%

“…The poor state of conservation of the building heritage requires a deep renovation action, considering that 40% of it has already exhausted its nominal service life, and most of existing buildings are obsolete and vulnerable to seismic actions. In detail, the post Second World War reinforced concrete heritage represents the 60% of such building stock [1]; Marini et al, 2017 [2]; Labò et al, 2017 [3]; Belleri et al, 2016 [4]; Feroldi et al, 2013 [5]). Those buildings are typically multi-storey structures, featuring one-way reinforced concrete (RC) frames, designed for gravity loads, with inadequate structural details.…”

Section: Introductionmentioning

confidence: 99%

Computational Issues of Hinged Walls Used as Retrofitting of Existing Rc Frames

Casprini¹,

Belleri²,

Passoni³

et al. 2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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In recent years hinged walls have been implemented as a retrofit technique for existing RC buildings. To investigate the effectiveness of the proposed solution on different frame typologies, non-linear 2D pushover analyses have been carried out. Two main configurations were adopted, representing an inner frame with weak beams and strong columns and a side frame with strong beams and weak columns, respectively. The study shows that some computational aspects are of fundamental importance in providing reliable results, namely: the dead load distribution on the beams and the moment-axial force interaction in the columns. The hinged wall technique proves to be an effective retrofit solution only if conceived properly for each structural typology; whilst in some cases it may be detrimental when applied in the traditional way. Some new configurations are herein proposed based on new connection layouts in order to be suitable for the different typologies of existing RC frames.

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“…Within this category, diagrids (Labò et al 2016;Labò et al 2017), gridshells, and traditional curtain walls (Passoni 2016) can be re-engineered to behave like shell structures.…”

Section: An Overview Of Possible Structural Solutions and Their Feasi...mentioning

confidence: 99%

“…Among the more innovative and integrated solutions, dissipative shell structures could be considered (Fig. 5d), where sub-components can be further engineered to dissipate energy either within the panels (Passoni 2016, Agha Beigi et al 2014, or along the interfaces of adjoining elements (Preti et al 2017), or along the interface of the new shell with its foundation (Labò et al 2016;Labò et al 2017). Regardless of the adopted solution, lumping the damage into replaceable elements triggers another challenge for the integrated intervention, given that the energy system must also be designed to accommodate possible localized displacements and to enable inspection, maintenance, and substitution of structural components.…”

Section: An Overview Of Possible Structural Solutions and Their Feasi...mentioning

confidence: 99%

Combining seismic retrofit with energy refurbishment for the sustainable renovation of RC buildings: a proof of concept

Marini

Passoni

Belleri

et al. 2017

European Journal of Environmental and Civil Engineering

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In this paper, an integrated approach targeting sustainability, safety, and resilience is envisioned for the renovation of the post-World War II RC buildings clustered in urban outskirts. The solution stems as an enhancement of the widespread camouflage practice, which targets energy efficiency and architectural restyling by complementing the building with a technological double skin, self-supported on an independent exoskeleton. Based on this integrated approach, the exoskeleton can be further engineered to also enable structural safety and resilience. Life cycle thinking is addressed to re-conceive traditional structural design approaches, guaranteeing safety, while minimizing costs and environmental impacts over the building life cycle. Accurate selection of materials and dry technologies enables adaptability, reparability and maintenance, and total recyclability/reuse at end-of-life. The intervention is carried out from outside, avoiding relocation of the inhabitants and possible building downtime. The paper introduces a possible framework for engineers, technologists, and architects to design new holistic renovation interventions, for which innovative solution sets are required. Possible structural techniques to be coupled with energy refurbishment are proposed. As a proof of concept, the envisaged holistic renovation strategy is applied to a reference building, and benefits entailed in combining structural safety measures within an integrated intervention are commented.

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Prefabricated Responsive Diagrids for Holistic Renovation of Existing Mid-Rise Rc Buildings

Abstract: Abstract. The holistic renovation of existing buildings is nowadays acknowledged as an essential and urgent action to reduce the environmental impact and increase

Cited by 11 publications

References 14 publications

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

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

Computational Issues of Hinged Walls Used as Retrofitting of Existing Rc Frames

Combining seismic retrofit with energy refurbishment for the sustainable renovation of RC buildings: a proof of concept

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