Quantification of Site City Interaction Effects on Responses of Buildings and Basin Under Realistic Earthquake Loading for Development of Economic Smart City

2021 ◽  
Author(s):  
Lav Joshi ◽  
J.P. Narayan
Keyword(s):  
Fundamental Frequency ◽  
Smart City ◽  
Free Field ◽  
Staggered Grid ◽  
Sediment Layer ◽  
Earthquake Loading ◽  
Sh Wave ◽  
The Past ◽  
Plane Incident Wave ◽  
Zero Phase

Abstract The paper presents the quantification of site-city-interaction (SCI) effects on the responses of buildings of a city and free field motion under realistic earthquake loading for the economic development of a smart city. The state of the art pseudo-dynamic earthquake rupture is implemented in the existing fourth-order viscoelastic staggered-grid SH-wave finite-difference program, and simulated results validated. SH-wave responses of various homogeneous and heterogeneous cities situated on horizontal sediment layer as well as in 2D heterogeneous basins are simulated and analyzed for different dynamic parameters of the buildings. The simulated SCI effects using realistic earthquake loading reveals a reduction of transfer function (TF) of buildings in a wide frequency bandwidth. This finding is conflicting with the reported splitting of bandwidth of the FoSB in the past SCI studies, carried out using simple plane incident wave-front with a single zero-phase wavelet. The obtained largest SCI effects on a building was highly dependent on the building type, city and basin heterogeneity in contrast to the general perception that it should be maximum at centre of city. It is also obtained that SCI effects are always beneficial to buildings when fundamental frequency of building on rock FoSR <1.4FoB( FoB is the fundamental frequency of basin/sediment layer). The obtained reduction of of building of city as well as free field motion due to the effects of SCI corroborates with the past SCI studies. The increase of coupling between the buildings and basin due to an increase of building density causes an increase of SCI effects on the responses of both the buildings and free field motion. The SCI effects in the case of buildings with low damping are beneficial during an earthquake. It is recommended that the smart city should be homogeneous in nature and of buildings should be less than around 1.4 times the of the underlying basin/sediment deposit and buildings should preferably be a steel one.

CPT-based liquefaction case histories compiled from three earthquakes in Canterbury, New Zealand

2021 ◽  
pp. 875529302199636
Author(s):  
Mertcan Geyin ◽  
Brett W Maurer ◽  
Brendon A Bradley ◽  
Russell A Green ◽  
Sjoerd van Ballegooy
Keyword(s):  
New Zealand ◽  
Case History ◽  
Prediction Models ◽  
Free Field ◽  
Case Histories ◽  
Cone Penetration ◽  
History Data ◽  
The Past ◽  
Surface Manifestation ◽  
The Many

Earthquakes occurring over the past decade in the Canterbury region of New Zealand have resulted in liquefaction case-history data of unprecedented quantity. This provides the profession with a unique opportunity to advance the prediction of liquefaction occurrence and consequences. Toward that end, this article presents a curated dataset containing ∼15,000 cone-penetration-test-based liquefaction case histories compiled from three earthquakes in Canterbury. The compiled, post-processed data are presented in a dense array structure, allowing researchers to easily access and analyze a wealth of information pertinent to free-field liquefaction response (i.e. triggering and surface manifestation). Research opportunities using these data include, but are not limited to, the training or testing of new and existing liquefaction-prediction models. The many methods used to obtain and process the case-history data are detailed herein, as is the structure of the compiled digital file. Finally, recommendations for analyzing the data are outlined, including nuances and limitations that users should carefully consider.

Saliency of Vowel Features in Neural Responses of Cochlear Implant Users

2018 ◽  
Vol 49 (6) ◽  
pp. 388-397
Author(s):  
François Prévost ◽  
Alexandre Lehmann
Keyword(s):  
Speech Recognition ◽  
Cochlear Implant ◽  
Fundamental Frequency ◽  
Mismatch Negativity ◽  
Free Field ◽  
Event Related Potentials ◽  
Oddball Paradigm ◽  
Aural Rehabilitation ◽  
Spectral Components ◽  
Related Potentials

Cochlear implants restore hearing in deaf individuals, but speech perception remains challenging. Poor discrimination of spectral components is thought to account for limitations of speech recognition in cochlear implant users. We investigated how combined variations of spectral components along two orthogonal dimensions can maximize neural discrimination between two vowels, as measured by mismatch negativity. Adult cochlear implant users and matched normal-hearing listeners underwent electroencephalographic event-related potentials recordings in an optimum-1 oddball paradigm. A standard /a/ vowel was delivered in an acoustic free field along with stimuli having a deviant fundamental frequency (+3 and +6 semitones), a deviant first formant making it a /i/ vowel or combined deviant fundamental frequency and first formant (+3 and +6 semitones /i/ vowels). Speech recognition was assessed with a word repetition task. An analysis of variance between both amplitude and latency of mismatch negativity elicited by each deviant vowel was performed. The strength of correlations between these parameters of mismatch negativity and speech recognition as well as participants’ age was assessed. Amplitude of mismatch negativity was weaker in cochlear implant users but was maximized by variations of vowels’ first formant. Latency of mismatch negativity was later in cochlear implant users and was particularly extended by variations of the fundamental frequency. Speech recognition correlated with parameters of mismatch negativity elicited by the specific variation of the first formant. This nonlinear effect of acoustic parameters on neural discrimination of vowels has implications for implant processor programming and aural rehabilitation.

scholarly journals Preliminary Exploration of Cell-Based SAW Detection for Water Toxicity

2018 ◽  
Author(s):  
Kun-Lin Lee ◽  
Fang Li ◽  
Anis Nurashikin Nordin ◽  
Ioana Voiculescu
Keyword(s):  
Fundamental Frequency ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Phase Cell ◽  
Sh Wave ◽  
Liquid Environment ◽  
Sensing Applications ◽  
Surface Sensing ◽  
Water Based ◽  
Theoretical Fundamental

Nowadays, many surface sensing mechanisms exist, not all of them can be applied in water-based environment. Most of surface sensing techniques were developed in air-based environment. In order to obtain a potential cell-based biosensor, the sensing method needs to be reliable and repeatable in liquid environment. Therefore, we adapt existing air-based surface acoustic sensor and promote the technology into water-based applications. The goal of this study is to apply surface acoustic waves (SAW) for water-based environment sensing. We will use shear horizontal wave (SH wave) as surface sensing mechanism. SH wave is a type of surface acoustic waves (SAW) which can be used for weight/mass sensing in the air environment. Interdigitated transducers (IDTs) induce the deformation of an ST-cut quartz crystal substrate in AC source and generate waves. With a thin layer of polymer like Parylene and polyimide, the SH wave will be confined between the interface of substrate and polymer layer without suffering the energy loss due to the liquid damping from above. The fundamental frequency of the SAW device is defined by the spacing between the electrodes of IDT. The frequency of interests for this research is below 100 MHz in water-based environment. Due to the stable frequency characteristics of ST-cut quartz in room temperature, this SAW device can be a good candidate for field applications. From an early IDTs design, investigation in material and IDTs configuration is necessary to improve signal quality in order to qualify for liquid phase cell-based bio-sensing applications. A simplified 3D unit cell FEM model is created to study the thickness effects of wave-guide and electrodes. Boundary conditions and assumptions are discussed in the modeling. The simulated eigenfrequency of SH mode is close to the theoretical fundamental frequency of the 64μm wavelength IDTs. The mass damping effects from gold electrodes is more significant than aluminum electrodes.

scholarly journals Numerical Modelling of Structures Adjacent to Retaining Walls Subjected to Earthquake Loading

Geosciences ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 486
Author(s):  
Xiaoyu Guan ◽  
Gopal S. P. Madabhushi
Keyword(s):  
Finite Element ◽  
Dynamic Behaviour ◽  
Retaining Wall ◽  
Free Field ◽  
Retaining Walls ◽  
Earthquake Loading ◽  
Bending Moments ◽  
Sheet Pile ◽  
Novel Approach ◽  
Active Zones

In an urban environment, it is often necessary to locate structures close to existing retaining walls due to congestion in space. When such structures are in seismically active zones, the dynamic loading attracted by the retaining wall can increase. In a novel approach taken in this paper, finite element-based numerical analyses are presented for the case of a flexible, cantilever sheet pile wall with and without a structure on the backfill side. This enables a direct comparison of the influence exerted by the structure on the dynamic behaviour of the retaining wall. In this paper, the initial static bending moments and horizontal stresses prior to application of any earthquake loading are compared to Coulomb’s theory. The dynamic behaviour of the retaining wall is compared in terms of wall-top accelerations and bending moments for different earthquake loadings. The dynamic structural rotation induced by the differential settlements of the foundations is presented. The accelerations generated in the soil body are considered in three zones, i.e., the free field, the active and the passive zones. The differences caused by the presence of the structure are highlighted. Finally, the distribution of horizontal soil pressures generated by the earthquake loading behind the wall, and in front of the wall is compared to the traditional Mononobe-Okabe type analytical solutions.

Enabling Smart City With Intelligent Congestion Control Using Hops With a Hybrid Computational Approach

2020 ◽  
Author(s):  
Sagheer Abbas ◽  
Muhammad Adnan Khan ◽  
Atifa Athar ◽  
Syed Ali Shan ◽  
Anwar Saeed ◽  
...  
Keyword(s):  
Congestion Control ◽  
Traffic Flow ◽  
Traffic Congestion ◽  
Smart City ◽  
Computational Approach ◽  
Current Signal ◽  
The Past ◽  
The Subject ◽  
Simulation Results

ABSTRACT In a smart city, the subject of the congestion-free traffic has been leading objectives from the past decade, and many approaches are adopted to make congestion-free roads. These approaches and signals at one junction are not inter-linked with the signal at the previous one. Therefore, the traffic flow on the same road and at associative roads is not smooth. The study proposed a model with a hybrid computational approach in which the current signal incorporates the associative signals information. Simulation results have shown that the proposed approach gives more attractive results as compared to previously published approaches. It will help improve the flow of traffic and reduce traffic congestion.

How Digitalization Is Affecting Urban Transformation

2022 ◽  
pp. 69-83
Author(s):  
Cinzia Bellone ◽  
Fabio Andreassi ◽  
Fabio Naselli
Keyword(s):  
Public Interest ◽  
Smart City ◽  
Urban Transformation ◽  
Digital Innovation ◽  
The Past ◽  
Digital Network ◽  
Critical Issues ◽  
Urban Project ◽  
New Research ◽  
Functional Transformations

The chapter aims to analyze the role that digital innovation has whenever it is connected in shaping urban spatial and functional transformations. It is capable of governing any kind of urban project that must find a new platform to engage in diverse modernity. The smart city implementation is one of the results of the new relationship between technology and physical settlement, but it still does not find methodological completeness as it is still linked to connected sensors and numerical flows of data. The chapter explores the critical issues and opens up new research paths following the study of some ongoing urban experimentations as have been amplified in the ongoing new phases in this post-pandemic 2021. The digital network can be a newly established matrix for both the territory and cities, just as roads and railways networks have been in the past – if it becomes a work of public interest on par with conventional urbanization infrastructure ones.

Response of piles and casings to horizontal free-field soil displacements

1984 ◽  
Vol 21 (4) ◽  
pp. 720-725 ◽  
Author(s):  
Peter M. Byrne ◽  
Donald L. Anderson ◽  
Walter Janzen
Keyword(s):  
Rigid Body ◽  
Free Field ◽  
Earthquake Loading ◽  
Field Soil ◽  
Simple Method ◽  
Laterally Loaded Pile ◽  
Laterally Loaded

A simple method of analysis for predicting the response of piles and casings to horizontal free-field soil displacements is presented. Such free-field displacements can be induced in the soil by ice or earthquake loading and can damage piles or casings within the soil. The method involves a modification to the conventional laterally loaded pile problem to account for the load induced by the free-field deflections.The method is applied to analyze the response of a casing within a caisson-retained island subject to high ice loading. The results indicate that flexible casings essentially track with the soil and are subjected to low forces and moments, whereas stiff casings deflect as a rigid body and attract high forces and moments.

scholarly journals De la cybernétique à l’architecture numérique: retour sur un demi-siècle de théories, pratiques, et projets expérimentaux

2017 ◽  
Vol 42 (3) ◽  
Author(s):  
Marion Roussel
Keyword(s):  
Smart City ◽  
Digital Design ◽  
The Past ◽  
1960S And 1970S ◽  
The 1960S ◽  
The City ◽  
Experimental Architecture

Background  Little is said about the influence of cybernetics on the architectural practices and theories of the past fifty years. Yet, from the discourses of the experimental architecture of the 1960s and 1970s, to those of the most advanced advocates of digital design, the terms and key themes of cybernetics keep coming back.Analysis  Focusing on the first attempts to apply cybernetics to architecture, then to the themes of the network, cyborg and cyberspace, and finally to the biological turn of the architecture of the 2000s, this article shows the prevalence of notions of the interactivity, adaptability, reflexivity, sensitivity and intelligence of architecture and the city in architects’ discourses.Conclusion and Implications  Architects have never stopped working on these cybernetics notions. Moreover, the latter are culminating today in the theme of the smart city.RÉSUMÉContexte  L’on parle peu de l’influence de la cybernétique sur les pratiques et théories architecturales de ces cinquante dernières années. Pourtant, depuis les discours de l’architecture expérimentale des années 1960-1970 jusqu’à ceux de la conception numérique la plus avant-gardiste, les termes et thèmes phares de la cybernétique sont bien présents.Analyse  À travers l’étude des premières tentatives d’application de la cybernétique à l’architecture, des thèmes du réseau, du cyborg et du cyberespace et enfin du tournant biologique de l’architecture des années 2000, cet article montre la prégnance des notions d’interactivité, d’adaptabilité, de réflexivité, de sensibilité et d’intelligence de l’architecture et de la ville dans les discours des architectes.Conclusion et implications  Ces notions, issues de la cybernétique, ont ainsi beaucoup nourri les architectes. Plus encore, elles atteignent aujourd’hui un point d’orgue à travers le thème de la smart city.

scholarly journals Foresight as a Tool for the Planning and Implementation of Visions for Smart City Development

Energies ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1782 ◽  
Author(s):  
Danuta Szpilko
Keyword(s):  
Economic Activity ◽  
Smart City ◽  
Smart Cities ◽  
Decision Makers ◽  
Continuous Change ◽  
City Development ◽  
The Past ◽  
Factors Analysis ◽  
Growth Economic

Global change, including population growth, economic development and climate change constitute urgent challenges for the smart cities of the 21st century. Cities need to effectively manage their development and meet challenges that have a significant impact on their economic activity, as well as health and quality of life for their citizens. In the context of continuous change, city decision-makers are constantly looking for new smart tools to tackle it. This article addresses this gap, indicating foresight as an effective tool that anticipates the future of a smart city. Its aim is to develop a methodology for planning and implementing a vision of smart city development based on foresight research. The proposed methodology consists of five stages and was developed with the use of methodology for designing hybrid systems. It is an organised, transparent and flexible process which can facilitate the development of sustainable and smart future visions of smart city development by virtue of the involvement, knowledge and experience of a large number of urban stakeholders at all stages of its creation. The article discusses in detail the operationalisation of each stage of the methodology in which the following main methods were used: megatrend analysis, factors analysis: social (S), technological (T), economic (E), ecological (E), political (P), relating to values (V) and legal (L) (STEEPVL), structural analysis, Delphi, creative visioning, scenarios and identifying actions related to the development of a smart city, divided into four categories: new, so far not undertaken (N); implemented so far, to be continued (C); redundant, to be discontinued (R); actions that have been implemented in the past and to be restored (R) (NCRR). The summary enumerates the benefits that foresight implementation can bring to the smart city.

scholarly journals Archive of bacterial community in anhydrite crystals from a deep-sea basin provides evidence of past oil-spilling in a benthic environment in the Red Sea

2016 ◽  
Vol 13 (23) ◽  
pp. 6405-6417 ◽  
Author(s):  
Yong Wang ◽  
Tie Gang Li ◽  
Meng Ying Wang ◽  
Qi Liang Lai ◽  
Jiang Tao Li ◽  
...  
Keyword(s):  
Red Sea ◽  
Deep Sea ◽  
Rrna Genes ◽  
Sediment Layer ◽  
Intact Cells ◽  
Crystal Sample ◽  
The Past ◽  
Atlantis Ii Deep ◽  
Benthic Environment ◽  
Oil Spilling

Abstract. In deep-sea sediment, the microbes present in anhydrite crystals are potential markers of the past environment. In the Atlantis II Deep, anhydrite veins were produced by mild mixture of calcium-rich hydrothermal solutions and sulfate in the bottom water, which had probably preserved microbial inhabitants in the past seafloor of the Red Sea. In this study, this hypothesis was tested by analyzing the metagenome of an anhydrite crystal sample from the Atlantis II Deep. The estimated age of the anhydrite layer was between 750 and 770 years, which might span the event of hydrothermal eruption into the benthic floor. The 16S/18S rRNA genes in the metagenome were assigned to bacteria, archaea, fungi and even invertebrate species. The dominant species in the crystals was an oil-degrading Alcanivorax borkumensis bacterium, which was not detected in the adjacent sediment layer. Fluorescence microscopy using 16S rRNA and marker gene probes revealed intact cells of the Alcanivorax bacterium in the crystals. A draft genome of A. borkumensis was binned from the metagenome. It contained all functional genes for alkane utilization and the reduction of nitrogen oxides. Moreover, the metagenomes of the anhydrites and control sediment contained aromatic degradation pathways, which were mostly derived from Ochrobactrum sp. Altogether, these results indicate an oxic, oil-spilling benthic environment in the Atlantis II basin of the Red Sea in approximately the 14th century. The original microbial inhabitants probably underwent a dramatic selection process via drastic environmental changes following the formation of an overlying anoxic brine pool in the basin due to hydrothermal activities.

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