Article
Engineering, Civil
A. Evkin
Summary: This study investigates the buckling of unstiffened axially compressed cylindrical shells under different types of local perturbations. An improved analytical model based on the Pogorelov's geometrical method is proposed, which effectively describes the qualitative properties of the buckling phenomena. The model is validated through comprehensive quantitative comparison with published numerical and experimental data, allowing for a thorough investigation of shell local buckling behavior and providing a criterion for design buckling load estimation.
THIN-WALLED STRUCTURES
(2021)
Article
Engineering, Civil
Z. Sadovsky, J. Krivacek, M. Sokol
Summary: This article conducts a theoretical study on the dependency of lower normalized buckling loads of axially compressed cylindrical shells on the radius-to-thickness ratio. The study shows that the imperfection sensitivity of shells is affected by the R/t ratio and the length ratio. Various energy measures and numerical examples are presented to illustrate these relationships and imperfection sensitivities.
ENGINEERING STRUCTURES
(2021)
Article
Multidisciplinary Sciences
Abubakr E. S. Musa, Madyan A. Al-Shugaa, Husain J. Al-Gahtani
Summary: Buckling is the most common type of failure for circular cylindrical shells subjected to axial compressive forces. The buckling stress of these shells is highly affected by geometric imperfections, such as localized damage (dents), which significantly reduce the buckling strength. This study numerically investigates the effect of dent imperfections on the buckling strength of shells with large R/t ratios, finding that dent size, depth, and position do not show a remarkable trend in their relationship with the reduction in buckling strength.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Civil
R. S. Priyadarsini, V. Kalyanaraman, S. M. Srinivasan
Summary: The integration of smart materials with thin walled structures can achieve desired mechanical properties without significant mass change. Experimental and numerical studies on the use of piezo ceramic (PZT) patches on thin composite cylindrical shells show improved strength and buckling resistance. The actuation of PZT can enhance stiffness, reduce local imperfections, and improve overall shell capacity.
THIN-WALLED STRUCTURES
(2021)
Article
Engineering, Civil
A. Evkin, O. Lykhachova
Summary: In this study, an energy barrier based measure of metastability for axially compressed cylindrical shells made of elasto-plastic material is developed. The concept of local shell buckling is used to estimate design buckling load, eliminating the need to measure initial geometric imperfections in large scale structures. Parametric analysis is performed to derive a formula for design buckling load which identifies the zone of high sensitivity of the shell to imperfections. The formula obtained is compared with experimental results and Eurocode EN 1993-1-6 (2007) recommendations.
THIN-WALLED STRUCTURES
(2021)
Article
Engineering, Civil
Fang Liu, Tianye Niu, Jian-Guo Gong, Haofeng Chen, Fu-Zhen Xuan
Summary: In this work, the buckling behaviours of cylindrical-conical-cylindrical assembly shells under axial compression at elevated temperature are investigated through experimental and numerical studies. Buckling experiments are conducted at 600 degrees C, followed by numerical predictions using a method that takes into account initial geometric imperfections. The effects of key factors on the buckling behaviours are discussed, and a good agreement is found between experimental and numerical results.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Civil
Haigui Fan, Wenguang Gu, Longhua Li, Peiqi Liu, Dapeng Hu
Summary: This study systematically investigates the buckling design of imperfection-sensitive cylindrical shells under axial compression based on the energy barrier approach, validating its reliability and advantage through numerical and experimental analyses. The results demonstrate that buckling design based on energy barrier approach can be used as an efficient way in the lightweight design of thin-shell structures.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2021)
Article
Materials Science, Multidisciplinary
Manoj H. Kumar, Sandeep Jose, C. Lakshmana Rao, Arun K. Tangirala
Summary: The ability to control the buckling response of a shell using piezoelectric actuators allows for the design of smart structures. This study analyzes the effects of localized and distributed placement of piezoelectric actuators on the buckling parameters of the shell, highlighting the importance of principal curvatures in determining the placement of discrete actuators.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Engineering, Civil
Qi He, Hong-Liang Dai, Qin Deng, Hong Tang
Summary: This paper presents an analytical approach to investigate the buckling behavior of a carbon fiber reinforced resin cylindrical shell covered with a damaged porous microcapsule coating under axial compressed loads in a hygrothermal environment. The study considers the effects of temperature, moisture, interface debonding damages, material properties, geometry parameters of microcapsules, and porosity on the buckling behavior. Results show that moisture and the geometry size of microcapsules play a significant role in the critical buckling and post-buckling compressive load, while micro-structure damage greatly affects temperature and moisture. Geometric parameters of microcapsules have a significant impact on the buckling and post-buckling behavior of the double-layered cylindrical shell.
ENGINEERING STRUCTURES
(2021)
Article
Engineering, Civil
Suhas Ankalhope, Sandeep Jose
Summary: The study aims to evaluate the practical feasibility of obtaining the maximum load carrying capacity of imperfect cylindrical shells without prior knowledge of the main defect location. By attempting three different methods, the results indicate that determining the Least Resistant Path and the corresponding location with the least energy barrier can significantly improve the effectiveness of the probing process.
THIN-WALLED STRUCTURES
(2022)
Article
Mathematics, Applied
Rainer M. J. Groh, Giles W. Hunt
Summary: This study uncovers new manifestations of homoclinic snaking in the post-buckling regime of a pressurized thin cylindrical shell under axial load, highlighting the effects of internal pressurization on the snaking mechanism.
IMA JOURNAL OF APPLIED MATHEMATICS
(2021)
Article
Multidisciplinary Sciences
Ming Ji
Summary: The classical theory of elastic critical buckling stress works well for slender columns and thin flat plates, but not for thin-walled circular cylindrical shells under longitudinal compression. The issue has been a problem for over 100 years. Current analyses have focused on the longitudinal buckling deformation mode and ignored the circumferential closed-loop eigenmode. It is necessary to consider both eigenmodes to accurately describe the periodic deformation of the shell under uniform longitudinal compression.
SCIENTIFIC REPORTS
(2023)
Article
Mechanics
Ciprian D. Coman, Andrew P. Bassom
Summary: In this paper, we revisit the bifurcation problem of an axially compressed thin elastic circular cylinder, taking into account the nonlinear pre-buckling bending deformations. By using suitable scaling arguments and singular perturbation methods, we explore the connection with the more widely studied classical cases and confirm our novel theoretical results through direct numerical simulations.
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2022)
Article
Engineering, Civil
Licai Yang, Tian Qiu, Shanglin Zhang
Summary: This paper analytically investigates the buckling behavior of cylindrical shells with axial variable elastic modulus under axial compressive load for the first time. The distributed elastic modulus is expressed as a combination of constant and variable components. Governing differential equations are derived and solved using the combined perturbation method and Fourier analysis. Closed analytical solutions are obtained for cylinders with arbitrary elastic modulus variations, revealing the relationships among buckling load, shell sizes, and elastic modulus functions. The presented solutions serve as benchmarks for buckling analyses of thin-walled cylinders with elastic modulus variations resulting from design, manufacturing processes, and material imperfections.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2023)
Article
Materials Science, Multidisciplinary
Wenguang Gu, Haigui Fan, Longhua Li, Zewu Wang, Peiqi Liu, Dapeng Hu
Summary: In this paper, a promising buckling design method for composite cylindrical shells is proposed and its reliability and advantages are verified through experiments. The study also reveals the significant impact of laminate stacking angles on the design buckling loads.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Chemistry, Multidisciplinary
Simone Ravasini, Beatrice Belletti, Emanuele Brunesi, Roberto Nascimbene, Fulvio Parisi
Summary: The study focuses on the progressive collapse resistance of a precast concrete (PC) frame building, analyzing the fundamental roles played by beam-to-column connection strength and tying reinforcement in such structures.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Geological
Volkan Ozsarac, Emanuele Brunesi, Roberto Nascimbene
Summary: This study investigates an energy dissipation system consisting of a floating roof and external dampers to control liquid vibration by increasing damping levels. Numerical simulations and seismic tests show that this dissipation system can reduce sloshing wave height in tanks during earthquakes, improving overall system performance.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2021)
Article
Engineering, Civil
Daniele Perrone, Derek Rodriguez, Andre Filiatrault, Emanuele Brunesi, Clemens Beiter, Roberto Piccinin
Summary: This paper presents a framework for quantifying seismic performance factors for non-structural elements (NSEs) and provides a case study example for calibrating the behavior factor for suspended piping seismic restraint installations.
JOURNAL OF EARTHQUAKE ENGINEERING
(2022)
Article
Engineering, Civil
Marco Bosio, Chiara Di Salvatore, Davide Bellotti, Luca Capacci, Andrea Belleri, Valeria Piccolo, Francesco Cavalieri, Bruno Dal Lago, Paolo Riva, Gennaro Magliulo, Roberto Nascimbene, Fabio Biondini
Summary: This study aims to assess the probabilistic seismic vulnerability of four existing single-story precast buildings designed according to outdated Italian building codes, taking into account the limited knowledge of seismic design and behavior in the past and the evolution of seismic zonation in the Italian territory.
JOURNAL OF EARTHQUAKE ENGINEERING
(2023)
Article
Engineering, Geological
Giammaria Gabbianelli, Daniele Perrone, Emanuele Brunesi, Ricardo Monteiro
Summary: Recent seismic events have highlighted the significance of non-structural elements in seismic assessment and performance-based earthquake engineering. This study focuses on the seismic performance assessment of liquid-storage tanks and emphasizes the importance of accurate modelling assumptions in estimating seismic demand and fragility. The results suggest the necessity for more accurate procedures and suitable intensity measures for non-structural elements.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2022)
Article
Geosciences, Multidisciplinary
M. Mandirola, C. Casarotti, S. Peloso, I. Lanese, E. Brunesi, I. Senaldi
Summary: This paper focuses on the use of drones for inspection and assessment of bridge infrastructures. It proposes a comprehensive methodology for the inspection and damage assessment of bridges using unmanned aerial systems. The paper emphasizes the importance of aerial data acquisition and analysis in structural modeling and risk assessment.
INTERNATIONAL JOURNAL OF DISASTER RISK REDUCTION
(2022)
Article
Construction & Building Technology
Ana I. Sarkis, Timothy J. Sullivan, Emanuele Brunesi, Roberto Nascimbene
Summary: A detailed nonlinear finite element model is proposed to accurately predict the shear failure mechanism and shear capacity of precast pre-stressed hollow-core (PPHC) slabs under vertical loading. The sensitivity study reveals that the modulus of rupture and crack bandwidth of the concrete, as well as the cross-sectional size of the solid mesh element, are the most important variables to consider in reliability studies.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Engineering, Geological
M. Deyanova, D. Bellotti, R. Nascimbene, S. Pampanin
Summary: This paper studied the non-linear response of slender columns by analyzing observed post-earthquake damage in Italy and Turkey, experimental data, and numerical predictions of failure patterns. The influence of foundation flexibility and the presence of industrial floor was also investigated. A simplified analytical methodology was proposed to predict the non-linear force-deformation response and possible failure mechanisms of slender precast columns. This research is important for seismic assessment and cost-efficient retrofit solutions for precast concrete industrial buildings.
BULLETIN OF EARTHQUAKE ENGINEERING
(2023)
Article
Engineering, Geological
Francesco Cavalieri, Davide Bellotti, Roberto Nascimbene
Summary: Italian reinforced concrete precast industrial buildings with frictional beam-to-column connections have suffered significant losses in recent earthquakes. However, there are few studies on the seismic behavior of these buildings, the influence of vertical records on their dynamic response, and the sensitivity of their seismic fragility to the implemented friction type. This research conducted sensitivity analysis and nonlinear dynamic analyses to determine fragility curves and treated uncertainty using a logic tree framework. The derived fragility curves can be used as guidance for researchers and practitioners analyzing reinforced concrete precast industrial buildings, especially when uncertain about the friction type and vertical records.
BULLETIN OF EARTHQUAKE ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Daniele Collura, Roberto Nascimbene
Summary: This study presents a comparative case study of the Vizzana-Zampogna viaduct, part of the A15 Parma-La Spezia motorway in Italy, to investigate its structural strength and vulnerability under seismic action. Through a multi-modal nonlinear static analysis, it is found that certain piers of the viaduct are most susceptible to seismic effects when different earthquake loads and intensities are introduced.
APPLIED SCIENCES-BASEL
(2023)
Article
Construction & Building Technology
Maria Rota, Martino Zito, Paolo Dubini, Roberto Nascimbene
Summary: Despite their seismic vulnerability and high replacement costs, non-structural elements are often not monitored. An experiment was conducted in an existing building where accelerometers were installed to compare accelerations applied to these elements during an earthquake with critical acceleration thresholds. This real-time assessment can help identify possible dangers and guide prioritization strategies in the aftermath of an earthquake.
Article
Construction & Building Technology
Tharindu Malinga Abeysiriwardena, Kushan Kalmith Wijesundara, Roberto Nascimbene
Summary: This research paper focuses on assessing seismic risk for school buildings in Sri Lanka by utilizing a probabilistic seismic hazard map. The study utilizes nonlinear finite element models and fragility functions to calculate the probability of collapse prevention and immediate occupancy. The findings reveal an increased damage probability with an increase in the number of stories in the buildings, regardless of their structural characteristics.
Article
Mechanics
Roberto Nascimbene
Summary: In this research, a new formula for shell structures is proposed, which improves the computational accuracy by splitting the shear energy and eliminating locking events with weight coefficients. The effectiveness and accuracy of the formula are demonstrated through analysis of real and analytical examples and comparisons with other shell finite elements.
CURVED AND LAYERED STRUCTURES
(2022)
Article
Construction & Building Technology
Michele Egidio Bressanelli, Davide Bellotti, Andrea Belleri, Francesco Cavalieri, Paolo Riva, Roberto Nascimbene
Summary: This research evaluates the influence of different modelling assumptions on the global and local seismic risk assessment of code-conforming precast reinforced concrete buildings, particularly focusing on the failure of beam-to-column connections with low displacement ductility after reaching yielding.
FRONTIERS IN BUILT ENVIRONMENT
(2021)
Review
Construction & Building Technology
Martino Zito, Roberto Nascimbene, Paolo Dubini, Danilo D'Angela, Gennaro Magliulo
Summary: Nonstructural elements (NEs) are elements within buildings/facilities that are not part of the structural system, classified as architectural elements, mechanical/electrical/hydraulic systems, and building contents. They pose a critical seismic risk due to their vulnerability and exposure, especially for critical facilities like hospitals and nuclear plants. The study reviews international testing approaches and protocols for seismic assessment of NEs, providing technical guidance for implementation and proposing a unified approach for their qualification.
