Seismic retrofit of existing buildings led by non-linear dynamic analyses

Porcu, Maria Cristina; Vielma, Juan Carlos; Panu, Francesco; Aguilar, Claudia Carrasco; Curreli, Giuseppe

doi:10.2495/safe-v9-n3-201-212

Cited by 13 publications

(18 citation statements)

References 15 publications

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“…The shear bond strength also tends to vary. Among those reported by different authors, a value of 0.3 MPa is selected for this work, which is the minimum reported in [36] and is within the range of values from 0.1 to 1.5 MPa suggested in [37]. The maximum shear strength depends on the masonry shear failure mode (shear friction failure, diagonal tensile failure, and compressive failure).…”

Section: Description Of the Corner Buildingmentioning

confidence: 93%

“…With the structural model, two types of analyses are carried out in a nonlinear range that is the most appropriate to determine the seismic response of buildings [37]. The first is the analysis with incremental thrust, both conventional and adaptive, while the second is the IDA, using records of the seismic event that occurred on the Ecuadorian coast and that caused the failure of the buildings located in Portoviejo.…”

Section: Determination Of the Seismic Response Of The Case Studiedmentioning

confidence: 99%

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Irregularity of the Distribution of Masonry Infill Panels and Its Effect on the Seismic Collapse of Reinforced Concrete Buildings

et al. 2021

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On 16 April 2016, an earthquake of Mw 7.8 shook the coast of Ecuador, causing the destruction of buildings and a significant number of casualties. Following a visit by the authors to the city of Portoviejo during the debris removal and recovery stage, it was noted that several reinforced concrete buildings located on corners had collapsed in the central part of the city. These buildings were characterized by the presence of masonry at the edges of the buildings but not between the two mostly open-plan facades on the corner for practical reasons. This article reviews the effect of masonry infill panels on the seismic response of reinforced concrete structures. For this, a model that contains the geometric and mechanical characteristics typical of collapsed buildings was generated and subjected to nonlinear analysis, with both static and dynamic increments. The results show the clear influence of the masonry infill panels on the structural response through the torsional behavior that is reflected in the evolution of the floor rotations. Finally, dynamic incremental analysis is used to obtain the collapse fragility curve of the building, and a new damage measure based on floor rotations is proposed.

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Section: Description Of the Corner Buildingmentioning

confidence: 93%

Section: Determination Of the Seismic Response Of The Case Studiedmentioning

confidence: 99%

Irregularity of the Distribution of Masonry Infill Panels and Its Effect on the Seismic Collapse of Reinforced Concrete Buildings

et al. 2021

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“…Among the methods covered by the design regulations, the non-linear dynamic analysis is the most accurate to assess the seismic performance of ductile dissipative structures, although it requires higher computational burden and designer skill [3,4]. It can be successfully applied to both the design of new buildings [5] and the seismic retrofit of existing structures [6,7]. Artificial neural networks (ANNs) have been successfully applied for different purposes in Civil Engineering, from the early warning of ground settlements in urban areas [8] to the control of dynamic effects in bridges and the development of decision support systems for industrialized manufacturing of buildings [9].…”

Section: Reference Multi-story Buildingmentioning

confidence: 99%

“…2021, 11, 4654 2 of 14 covered by the design regulations, the non-linear dynamic analysis is the most accurate to assess the seismic performance of ductile dissipative structures, although it requires higher computational burden and designer skill [3,4]. It can be successfully applied to both the design of new buildings [5] and the seismic retrofit of existing structures [6,7].…”

Section: Introductionmentioning

confidence: 99%

Optimal Design of Earthquake-Resistant Buildings Based on Neural Network Inversion

2021

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An effective seismic design entails many issues related to the capacity-based assessment of the non-linear structural response under strong earthquakes. While very powerful structural calculation programs are available to assist the designer in the code-based seismic analysis, an optimal choice of the design parameters leading to the best performance at the lowest cost is not always assured. The present paper proposes a procedure to cost-effectively design earthquake-resistant buildings, which is based on the inversion of an artificial neural network and on an optimization algorithm for the minimum total cost under building code constraints. An exemplificative application of the method to a reinforced-concrete multi-story building, with seismic demands corresponding to a medium-seismicity Italian zone, is shown. Three design-governing parameters are assumed to build the input matrix, while eight capacity-design target requirements are assigned for the output dataset. A non-linear three-dimensional concentrated plasticity model of the structure is implemented, and time-history dynamic analyses are carried out with spectrum-consistent ground motions. The results show the promising ability of the proposed approach for the optimal design of earthquake-resistant structures.

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“…In terms of economic benefit and environmental sustainability, the best choice is to retrofit existing structures rather than demolish them and rebuild new ones. Among many retrofitting methods [4][5][6][7][8][9][10][11], the placement of viscous dampers may be one of the easy ways to improve the seismic performance of structures, because it only induces limited downtime. To date, many studies have focused on the retrofitting of structures with viscous dampers.…”

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confidence: 99%

Retrofit Existing Frame Structures to Increase Their Economy and Sustainability in High Seismic Hazard Regions

Zhang

2019

Applied Sciences

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Featured Application: The study can be used for retrofitting frame structures to satisfy a revised seismic design code, where a building site had a low seismic hazard but now has a high seismic hazard. Abstract:The study proposes a retrofitting method with an optimum design of viscous dampers in order to improve the structural resistant capacity to earthquakes. The retrofitting method firstly uses a 2D frame model and places the viscous dampers in the structure to satisfy the performance requirements under code-specific design earthquake intensities and then performs an optimum design to increase the structural collapse-resistant capacity. The failure pattern analysis and fragility analysis show that the optimum design leads to better performance than the original frame structure. For regular structures, it is demonstrated that the optimum pattern of viscous damper placement obtained from a 2D frame model can be directly used in the retrofitting of the 3D frame model. The economic loss and repair time analyses are conducted for the retrofitted frame structure under different earthquake intensities, including the frequent earthquake, the occasional earthquake, and the rare earthquake. Although the proposed method is based on time-history analyses, it seems that the computational cost is acceptable because the 2D frame model is adopted to determine the optimum pattern of viscous damper placement; meanwhile, the owner can clearly know the economic benefits of the retrofitting under different earthquake intensities. The retrofitting also causes the frame to have reduced environmental problems (such as carbon emission) compared to the original frame in the repair process after a rare earthquake happens. Appl. Sci. 2019, 9, 5486 2 of 23 due to several aspects; e.g., the new observations from recent earthquakes, technical improvements of hazard analysis, data accumulation, and societal and economic increases.One of the issues is that a large number of existing buildings have insufficient resistant capacities to satisfy the increased design earthquake intensity. In terms of economic benefit and environmental sustainability, the best choice is to retrofit existing structures rather than demolish them and rebuild new ones. Among many retrofitting methods [4][5][6][7][8][9][10][11], the placement of viscous dampers may be one of the easy ways to improve the seismic performance of structures, because it only induces limited downtime. To date, many studies have focused on the retrofitting of structures with viscous dampers. Pekcan et al. [12] showed that the setting of the viscous damper coefficient of the story should be according to the story shear, and placements of dampers at upper stories may be not effective. Uriz and Whittaker [13] studied the effectiveness of using viscous dampers for the retrofit of a frame building before the Northridge earthquake. Silvestri and Trombetti [14] presented a parametric analysis to compare the performances offered by various systems of added viscous dampers in shear-type structures. ...

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Seismic retrofit of existing buildings led by non-linear dynamic analyses

Cited by 13 publications

References 15 publications

Irregularity of the Distribution of Masonry Infill Panels and Its Effect on the Seismic Collapse of Reinforced Concrete Buildings

Irregularity of the Distribution of Masonry Infill Panels and Its Effect on the Seismic Collapse of Reinforced Concrete Buildings

Optimal Design of Earthquake-Resistant Buildings Based on Neural Network Inversion

Retrofit Existing Frame Structures to Increase Their Economy and Sustainability in High Seismic Hazard Regions

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