The non-uniform early structural response of globular proteins to cold denaturing conditions: A case study with Yfh1

2014 ◽  
Vol 141 (20) ◽  
pp. 205103 ◽  
Author(s):  
Prathit Chatterjee ◽  
Sayan Bagchi ◽  
Neelanjana Sengupta
Keyword(s):  
Structural Response ◽  
Globular Proteins

scholarly journals Structural Assessment of the Hull Response of an FPSO Unit to Dropped Objects: A Case Study

2019 ◽  
Vol 26 (4) ◽  
pp. 39-46 ◽  
Author(s):  
Ozgur Ozguc
Keyword(s):  
Structural Damage ◽  
Local Buckling ◽  
Structural Response ◽  
Offshore Structures ◽  
Mechanical Equipment ◽  
Structural Members ◽  
Impact Area ◽  
Explicit Dynamic ◽  
The Impact

Abstract Offshore structures are exposed to the risk of damage caused by various types of extreme and accidental events, such as fire, explosion, collision, and dropped objects. These events cause structural damage in the impact area, including yielding of materials, local buckling, and in some cases local failure and penetration. The structural response of an FPSO hull subjected to events involving dropped objects is investigated in this study, and non-linear finite element analyses are carried out using an explicit dynamic code written LS-DYNA software. The scenarios involving dropped objects are based on the impact from the fall of a container and rigid mechanical equipment. Impact analyses of the dropped objects demonstrated that even though some structural members were permanently deformed by drop loads, no failure took place in accordance with the plastic strain criteria, as per NORSOK standards. The findings and insights derived from the present study may be informative in the safe design of floating offshore structures.

Risk Mitigation Through the Application of New Power Umbilical Technology

2012 ◽  
Author(s):  
Alan Dobson ◽  
Steven Frazer
Keyword(s):  
Aluminum Alloy ◽  
Deep Water ◽  
Risk Mitigation ◽  
Electrical Power ◽  
Structural Response ◽  
Power Cable ◽  
Enabling Technology ◽  
Effect Analysis ◽  
Design Case Study

This paper describes the substantial service life improvements that can be achieved through a new, high technology solution developed for deep water electrical power umbilical and cable applications. The new design represents an enabling technology for power cable projects in the deepest and most dynamic waters, provides a lower risk solution for risers in highly stressed conditions and can give a technically improved solution for the range of electrical power umbilical application. The significant advantages of aluminum alloy cable bundles over traditional copper cable bundles under static and dynamic loading associated with a typical deep water floating installation are presented. A design case study is used to illustrate improvements in structural response and fatigue life associated with the aluminum alloy cable cores against conventional technologies. The paper concludes with an overview of the associated risk reduction through the implementation of the aluminum alloy cables in the form of a failure mode and effect analysis.

Seismic Damage Control with Passive Energy Devices: A Case Study

1995 ◽  
Vol 11 (2) ◽  
pp. 217-232 ◽  
Author(s):  
Robert J. McNamara
Keyword(s):  
Damage Control ◽  
Structural Response ◽  
Seismic Damage ◽  
Reinforced Concrete Frame ◽  
Energy Devices ◽  
Concrete Frame ◽  
Supplemental Damping ◽  
Damper Design ◽  
Supplemental Dampers

This paper presents a theoretical case study of the effectiveness of supplemental passive damping devices in reducing structural response during seismic excitation. A six story special moment resistant reinforced concrete frame is studied with and without the aid of supplemental dampers. Response predictions are presented for each case. Preliminary damper design requirements are presented for a new facility implementing the supplemental damping system to reduce seismic damage and improve the post earthquake operational capability of the facility.

Numerical calibration of railway bridge based on measurement data

2021 ◽  
Author(s):  
Stefan Lachinger ◽  
Marian Ralbovsky ◽  
Alois Vorwagner ◽  
Doron Hekič ◽  
Mirko Kosič ◽  
...  
Keyword(s):  
Numerical Models ◽  
Measurement Data ◽  
Structural Response ◽  
Finite Element Models ◽  
Traffic Loads ◽  
Model Response ◽  
Independent Calibration ◽  
Truss Bridge ◽  
Calculated Model

<p>Bridges rarely behave precisely according to design assumptions. In most cases, they have some hidden reserves and behave preferable under traffic loads. To take these benefits into consideration numerical models can be calibrated based on measured structural response. The case study presented herein shows the calibration process for a railway truss bridge in Austria and the comparison of calibration results obtained by two individual teams. Each team did an individual and independent calibration based on different finite element models based on measured train passages. Both calibrations improved the precision of the calculated model response compared to the initial model, but also showed that the calibration parameters must be chosen with care to ensure plausibility of the results.</p>

Static Analysis of Gravity Dams Considering Foundation-Structure Interaction

2016 ◽  
Vol 857 ◽  
pp. 237-242
Author(s):  
Margaret Abraham ◽  
Bennet Kuriakose ◽  
Reni Kuruvilla
Keyword(s):  
Numerical Model ◽  
Structural Design ◽  
Seismic Analysis ◽  
Structural Response ◽  
Fluid Structure Interactions ◽  
Gravity Dams ◽  
Structure Interaction ◽  
Optimum Depth ◽  
Foundation Structure

A dam is an artificial barrier constructed across a stream channel to impound water. Analysis of stresses and displacements are inevitable for the structural design and failure analysis of dams. This paper deals with the numerical simulation of structural response of gravity dams, duly considering the foundation-structure interaction. The optimum depth and width of foundation extend to be considered in the numerical model is also studied. A parametric study based on the stiffness of the foundation is also exercised. As an application of the developed model, a case study of Peechi gravity dam is presented. This study proved the importance of consideration of foundation-structure interaction in the structural analysis of dams. The developed numerical model can be further improved for performing seismic analysis of gravity dams, considering the foundation-structure as well as fluid-structure interactions.

scholarly journals Kriging Metamodel-Based Seismic Fragility Analysis of Single-Bent Reinforced Concrete Highway Bridges

Buildings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 238
Author(s):  
Phuong Hoa Hoang ◽  
Hoang Nam Phan ◽  
Duy Thao Nguyen ◽  
Fabrizio Paolacci
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Fragility Curves ◽  
Structural Response ◽  
Highway Bridges ◽  
Fragility Analysis ◽  
Seismic Fragility ◽  
Kriging Metamodel ◽  
Different Sources

Uncertainty quantification is an important issue in the seismic fragility analysis of bridge type structures. However, the influence of different sources of uncertainty on the seismic fragility of the system is commonly overlooked due to the costly re-evaluation of numerical model simulations. This paper aims to present a framework for the seismic fragility analysis of reinforced concrete highway bridges, where a data-driven metamodel is developed to approximate the structural response to structural and ground motion uncertainties. The proposed framework to generate fragility curves shows its efficiency while using a few finite element simulations and accounting for various modeling uncertainties influencing the bridge seismic fragility. In this respect, a class of single-bent bridges available in the literature is taken as a case study, whose three-dimensional finite element model is established by the OpenSees software framework. Twenty near-source records from different sources are selected and the Latin hypercube method is applied for generating the random samples of modeling and ground motion parameters. The Kriging metamodel is then driven on the structural response obtained from nonlinear time history analyses. Component fragility curves of the reinforced concrete pier column are derived for different damage states using the Kriging metamodel whose parameters are established considering different modeling parameters generated by Monte Carlo simulations. The results demonstrate the efficiency of the proposed framework in interpolating the structural response and deriving the fragility curve of the case study with any input conditions of the random variables.

scholarly journals Seismic Vulnerability Assessment and Strengthening Interventions of Structural Units of a Typical Clustered Masonry Building in the Campania Region of Italy

GeoHazards ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 101-119
Author(s):  
Antonio Formisano ◽  
Nicola Chieffo ◽  
Generoso Vaiano
Keyword(s):  
Seismic Vulnerability ◽  
Structural Response ◽  
Masonry Building ◽  
Structural Behaviour ◽  
Seismic Behaviour ◽  
Structural Units ◽  
Campania Region ◽  
Seismic Vulnerability Assessment ◽  
Before And After

The present paper aims at inspecting the structural behaviour of a typical masonry aggregate located in the historical centre of Cercola, a municipality in the province of Naples. The clustered building under study consists of four structural units mutually connected to each other made of tuff stone and deformable floors. Two distinct structural units, namely in heading and intermediate places, in both isolated and aggregate conditions, are examined to estimate the influence of structural positions on the global seismic response of the examined case study buildings. For this purpose, non-linear static analyses are performed using the 3MURI software. Pushover analyses are conducted to both evaluate the seismic behaviour of examined structural units and improve their earthquake performances while considering proper retrofit interventions on vertical and horizontal structures. The analysis results are plotted in terms of risk factor, stiffness, and ductility. Finally, a set of fragility functions are derived to point out the structural response of the case study buildings before and after retrofit interventions. From the achieved results, it is highlighted that retrofit interventions improve the structural performances of the buildings, especially those of structural units in aggregate conditions.

Seismic Fragility Analysis of a Water Storage Structure

2004 ◽  
Author(s):  
K. Bhargava ◽  
A. K. Ghosh ◽  
S. Ramanujam
Keyword(s):  
Seismic Analysis ◽  
Water Storage ◽  
Structural Response ◽  
Seismic Fragility ◽  
Material Strength ◽  
Structural Damping ◽  
Ground Acceleration ◽  
Storage Structure ◽  
Hydrodynamic Effects

The present paper is concerned with the seismic response and fragility evaluation of a water storage structure. Seismic analysis has been carried out considering the hydrodynamic effects of the contained water. The various parameters that could affect the seismic structural response include material strength of concrete, structural damping available within the structure and the normalized ground motion response spectral shape. Based on this limited case study; the seismic fragility of the structure is developed as families of conditional probability curves plotted against peak ground acceleration (PGA) at the location of interest. The procedure adopted incorporates the various randomness and uncertainty associated with the parameters under consideration.

scholarly journals On the Robustness of Earthquake-Resistant Moment-Resistant Frames: Influence of Innovative Beam-to-Column Joints

2018 ◽  
Vol 12 (1) ◽  
pp. 101-111 ◽  
Author(s):  
Antonella Bianca Francavilla ◽  
Massimo Latour ◽  
Gianvittorio Rizzano ◽  
Jean-Pierre Jaspart ◽  
Jean-Francois Demonceau
Keyword(s):  
Computer Software ◽  
Structural Response ◽  
Energy Balance Method ◽  
Friction Dampers ◽  
Dog Bone ◽  
Earthquake Resistant ◽  
Resistant Moment ◽  
Push Down ◽  
Reserve Strength

Background: The deformation capacity of beam-to-column connections strongly influences the robustness of earthquake-resistant Moment Resistant Frames (MRFs) when subjected to a loss-of column scenario. As a consequence, with the aim of foresee the structural response up to the failure, an accurate modelling of the ultimate behaviour of the joints is needed. Objective: In this paper, the influence of the connections on the behaviour of MRFs under a loss-of-column scenario has been analysed considering an accurate modelling of the joints. Method: In addition, in order to achieve this goal, different beam-to-column joints designed for seismic actions and tested at the Salerno University, have been modelled and introduced in a case-study structure, whose response has been evaluated by means of push-down analyses. In particular, the connections analysed and modelled are of three different types: a dog-bone connection, a partial strength Double Split Tee (DST) joint and a partial strength connection with friction dampers. Results / Conclusion: The results of pushdown analyses performed by means of SAP2000 computer software have been examined with the aim to determine the Residual Reserve Strength Ratio (RRSR) index that, combined with the energy balance method proposed by Izzudin et al. (2008), allow to assess the structural ro-bustness.

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