scholarly journals Seismic Response of Acceleration-Sensitive Non-Structural Components in Buildings

Buildings ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 7 ◽  
Author(s):  
Carmine Lima ◽  
Enzo Martinelli
Keyword(s):  
Dynamic Response ◽  
Seismic Response ◽  
Parametric Analysis ◽  
Short Review ◽  
Mechanical Parameters ◽  
Structural Components ◽  
Current State ◽  
Critical Issues ◽  
Key Features ◽  
Two Degree Of Freedom

This paper aims at highlighting the main mechanical parameters controlling the behavior of the so-called ‘acceleration-sensitive’ non-structural components (NSCs). The first reports a short review of the current state of knowledge and the critical issues dealing with the prediction of the seismic response of NSCs. Then, the paper presents the results of a numerical parametric analysis intended to capture the key features of the coupled dynamic response of a two-degree-of-freedom (2DOF) system supposed to be representative of both main structure and ‘non-structural’ component (NSC). The main parameters controlling the dynamic response of NSCs emerge from this study, which could pave the way towards formulating more mechanically consistent relationships for evaluating the peak accelerations induced by seismic shakings on NSCs in buildings.

scholarly journals On Predicting the Seismic Response of Acceleration-Sensitive Non-Structural Components in Buildings

2018 ◽  
Author(s):  
Carmine Lima ◽  
Enzo Martinelli
Keyword(s):  
Dynamic Response ◽  
Seismic Response ◽  
Parametric Analysis ◽  
Short Review ◽  
Structural Components ◽  
Main Structure ◽  
Current State ◽  
Critical Issues ◽  
Key Features ◽  
Two Degree Of Freedom

This paper is intended at highlighting the main mechanical parameters controlling the behavior of the so-called "acceleration-sensitive" Non-Structural Components (NSCs). In the first part a short review of the current state of knowledge and the critical issues related to the prediction of the seismic response of NSCs is reported. Then, the paper presents the results of a numerical parametric analysis intended to capture the key features of the dynamic response of a two-degree-of-freedom (2DOF) system which is supposed to be representative of both the main structure and the "non-structural" component (NSC). Particularly, it allows to simulate the coupled behaviour of both main structure and NSC and evaluating their response. The main parameters controlling the dynamic response of NSCs emerge from this study, which could pave the way towards formulating more mechanically consistent relationships for evaluating the maximum accelerations induced by seismic shakings on NSCs.

An Overview of the Current Code Provisions on the Seismic Response of Acceleration-Sensitive Non-Structural Components in Buildings

2016 ◽  
Vol 847 ◽  
pp. 273-280 ◽  
Author(s):  
Enzo Martinelli ◽  
Ciro Faella
Keyword(s):  
Seismic Response ◽  
Structural Components ◽  
Assessment Practice ◽  
Design Assessment ◽  
Main Structure ◽  
Current State ◽  
Industrial Buildings ◽  
Significant Damage ◽  
The Difference ◽  
Observed Damage

The seismic response of non-structural components in civil and industrial buildings, often neglected or disregarded in the common design/assessment practice, revealed its dramatic relevance in recent seismic events that resulted in significant damage observed in the wide class of “objects” referred to as “non-structural components” (e.g., partitions, masonry infill, suspended ceilings, finishing, specific equipment and so on. The observed damage, sometimes leading to collapse of these components and even loss of human lives, highlighted the lack of knowledge that still affects both analysis procedures and design/assessment methods currently adopted for analysing their seismic response. This paper is mainly intended at providing readers with an overview of both the historical development and the current state of the formulations adopted by codes and standards for evaluating the maximum accelerations induced by seismic shakings on non-structural components. The difference among these formulations is firstly outlined and the predictions based on the most up-to-date codes are compared with the results of a wide parametric analysis based on a 2DOF system, intended at simulating the coupled response of both main structure and non-structural component. This parametric comparison shows that the current formulations are not fully capable of reproducing the effect of the interaction between main structure and non-structural components

Short Review and opinion: New matter properties and applications based on Hybrids Graphene based Metamaterials

2020 ◽  
Vol 04 ◽  
Author(s):  
A. Guillermo Bracamonte
Keyword(s):  
Short Review ◽  
New Materials ◽  
Design And Synthesis ◽  
Chemical Structures ◽  
Current State ◽  
Potential Applications ◽  
Fundamental Research ◽  
Miniaturized Instrumentation ◽  
And Control ◽  
Conductive Properties

: Graphene as Organic material showed special attention due to their electronic and conductive properties. Moreover, its highly conjugated chemical structures and relative easy modification permitted varied design and control of targeted properties and applications. In addition, this Nanomaterial accompanied with pseudo Electromagnetic fields permitted photonics, electronics and Quantum interactions with their surrounding that generated new materials properties. In this context, this short Review, intends to discuss many of these studies related with new materials based on graphene for light and electronic interactions, conductions, and new modes of non-classical light generation. It should be highlighted that these new materials and metamaterials are currently in progress. For this reason it was showed and discussed some representative examples from Fundamental Research with Potential Applications as well as for their incorporations to real Advanced devices and miniaturized instrumentation. In this way, it was proposed this Special issue entitled “Design and synthesis of Hybrids Graphene based Metamaterials”, in order to open and share the knowledge of the Current State of the Art in this Multidisciplinary field.

Parametric analysis of the seismic response of a 2D sedimentary valley: implications for code implementations of complex site effects

2005 ◽  
Vol 25 (4) ◽  
pp. 303-315 ◽  
Author(s):  
Konstantia Makra ◽  
Francisco J. Chávez-García ◽  
Dimitrios Raptakis ◽  
Kyriazis Pitilakis
Keyword(s):  
Seismic Response ◽  
Parametric Analysis ◽  
Site Effects

scholarly journals Inelastic Parametric Analysis of Seismic Responses of Multistorey Bidirectional Eccentric Structure

2018 ◽  
Vol 2018 ◽  
pp. 1-20
Author(s):  
Yu-ping Kuang ◽  
Xin-liang Jiang ◽  
Nan Jiang
Keyword(s):  
Seismic Response ◽  
Parametric Analysis ◽  
Coupling Effect ◽  
Parameter Analysis ◽  
Seismic Responses ◽  
Load Direction ◽  
General Law ◽  
Eccentric Structure ◽  
Natural Frequency Variation ◽  
Elastic Stage

This paper conducts a parametric study on the seismic response of multistorey bidirectional eccentric structures from elastic stage to inelastic stage. Based on a simplified multistorey bidirectional eccentric model composed of bidirectional lateral load-resisting members, a general law is proposed for three-stage natural frequency variation behaviour from elastic stage to inelastic stage of eccentric frame structures with different layers. Different simplification treatments are conducted on each stage and the three stable parameter analysis stages are defined. The corresponding dynamic stiffness matrices and motion equations in different loading stages are derived. On this basis, a parametric analysis of seismic response of a three-storey bidirectional regular eccentric structure from elastic stage to inelastic stage is conducted. Effects of the uncoupled torsion to lateral frequency ratios (Ω) and bidirectional eccentricities on the seismic responses are investigated. The results reveal that as Ω increases, translational displacement in the load direction first decreases and then increases; meanwhile, the displacement perpendicular to load direction and torsion displacement first rise and then decrease sharply. When Ω=1.1, the coupling effect between the translation in the load direction and the torsion is at its strongest condition. Increasing the eccentricities leads to a decrease in the displacement in the load direction as well as an increase in the displacement perpendicular to load direction and torsion displacement. Variation regularity of inelastic seismic response is remarkably different from that in elastic stage. The lateral-torsional coupling effect of the bidirectional eccentric structure is closely related to both the period ratio and the bidirectional eccentricities.

scholarly journals Liver transplantation for metastatic colorectal cancer (case report)

2019 ◽  
Vol 23 (4) ◽  
pp. 54-67
Author(s):  
I. A. Porshennikov ◽  
A. V. Sokolov ◽  
E. E. Shchekina ◽  
A. Yu. Chubukov ◽  
T. A. Tretyakova ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Liver Transplantation ◽  
Metastatic Colorectal Cancer ◽  
Short Review ◽  
Cancer Case ◽  
Current State ◽  
Cancer Metastases ◽  
Colorectal Cancer Case ◽  
Unresectable Liver Metastases ◽  
Colorectal Cancer Metastases

Liver transplantation is currently controversial for colorectal cancer metastases and not recommended in clinical guidelines. We report the first Russian case of liver transplantation from cadaveric donor in a patient with multiple bilobar unresectable liver metastases of colon cancer. We observe no recurrences within 10 months on everolimus-based immunosuppression and adjuvant treatment. The current state of the problem and the place of liver transplantation in metastatic colorectal cancer treatment are discussed in a short review.

scholarly journals CO2 Utilization and Long-Term Storage in Useful Mineral Products by Carbonation of Alkaline Feedstocks

2021 ◽  
Vol 9 ◽  
Author(s):  
Renato Baciocchi ◽  
Giulia Costa
Keyword(s):  
Raw Materials ◽  
Mineral Carbonation ◽  
Carbon Utilization ◽  
Waste Streams ◽  
Long Term Storage ◽  
Current State ◽  
Critical Issues ◽  
Term Storage ◽  
Change Mitigation

Accelerated carbonation is a carbon utilization option which allows the manufacturing of useful products, employing CO2-concentrated or -diluted emission sources and waste streams such as industrial or other processing solid residues, in a circular economy perspective. If properly implemented, it may reduce the exploitation of virgin raw materials and their associated environmental footprint and permanently store CO2 in the form of Ca and/or Mg carbonates, thus effectively contributing to climate change mitigation. In this perspective article, we first report an overview of the main mineral carbonation pathways that have been developed up to now, focusing on those which were specifically designed to obtain useful products, starting from different alkaline feedstocks. Based on the current state of the art, we then discuss the main critical issues that still need to be addressed in order to improve the overall feasibility of mineral carbonation as a CCUS option, as well as research needs and opportunities.

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