Punch-Through Risk of Jack-Up Under the Dual Uncertainty of Structure and Foundation

2019 ◽  
Vol 142 (2) ◽  
Author(s):  
Tao Lyu ◽  
Changhang Xu ◽  
Guoming Chen ◽  
Yipei Zhao ◽  
Tantan Zhao ◽  
...  
Keyword(s):  
Dominant Factor ◽  
Order Moment ◽  
Structural Vulnerability ◽  
Dual Uncertainty ◽  
Sensitivity Studies ◽  
Consistent Method ◽  
Solution Efficiency ◽  
Foundation Parameters ◽  
Jack Up ◽  
Hazard Levels

Abstract The preload operation of Jack-up in complex multi-layered foundation requires an enhanced understanding of its behavior in punch-through accident and suitable safety analysis tools for the assessment of their reliability in a particular site. In order to evaluate punch-through risk, a risk-consistent method is proposed based on the model of foundation hazard and structural vulnerability. Besides, foundation bearing capacity is evaluated to quantify foundation hazard. Third, to improve the solution efficiency, higher-order moment method (HOMM)-Pushover method has been developed for assessing the structural vulnerability. In addition, case studies are presented to demonstrate the advantages of these techniques and important trends are highlighted by the results of parametric sensitivity studies. More specifically, failure probability analysis has been undertaken using improved method and the punch-through risk is evaluated quantitatively in different hazard levels. The results show that the dual uncertainty of both structure and foundation is crucial for assessment of foundation hazard and structural vulnerability. The randomness of foundation parameters is the dominant factor affecting the punch-through risk, and the risk increases with the increase of preload weight. The time-varying risk in the process of preload operation can be revealed using the risk analysis method mentioned in this paper.

scholarly journals Numerical Simulations for Installation of Offshore Wind Turbine Monopiles Using Floating Vessels

2013 ◽  
Author(s):  
Lin Li ◽  
Zhen Gao ◽  
Torgeir Moan
Keyword(s):  
Time Domain ◽  
Coupled System ◽  
Dynamic Responses ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Support Structures ◽  
Offshore Wind Turbines ◽  
Motion Responses ◽  
Sensitivity Studies ◽  
Jack Up

Monopiles are the most commonly used support structures for offshore wind turbines with up to 40m water depth due to the simplicity of the structure. The installation of turbine support structures can be carried out by a jack-up vessel which provides a stable working platform. However, the operational weather window using jack-up vessels is very limited due to the low sea states required for jacking up and down. Compared to jack-up installation vessels, floating vessels have more flexibility due to fast transportations between foundations. However, the vessel motions will affect the motion responses of the lifting objects, which might bring installation difficulties. Therefore, it is necessary to examine the dynamic responses of the coupled system to ensure safe offshore operations. In this paper, the installation operation of a monopile using a floating installation vessel is studied by a numerical model. Time domain simulations were carried out to study the installation process of a monopile, including lowering phase, landing phase and steady states after landing. Sensitivity studies were performed focusing on the effects by the gripper device stiffness and landing device stiffness. Comparisons of critical responses by using floating vessel and a jack-up vessel were also studied in the paper.

Thrombelastography during and after Elective Abdominal Surgery

1978 ◽  
Vol 39 (02) ◽  
pp. 488-495 ◽  
Author(s):  
J M Butler
Keyword(s):  
Abdominal Surgery ◽  
Factor Viii ◽  
Whole Blood ◽  
Dominant Factor ◽  
Fibrinogen Concentration ◽  
Factor Viii Activity ◽  
Elective Abdominal Surgery

SummaryThrombelastography has been performed on recalcified whole blood from 50 patients before, during and after elective abdominal surgery. The characteristic changes of the thrombelastographic indices r, k and mA are described.During operation r and k shortened, but no change in mA was observed. This response was in part associated with an increase in factor VIII activity. Following operation, while r time was somewhat shortened, much more marked changes in k and mA were evident. Increasing fibrinogen concentration was the dominant factor in determining the post-operative changes in the thrombelastograph.

Effect of No-load and Load Condition on Transformer Sound

2018 ◽  
pp. 11-15
Author(s):  
Dr. Hitesh Paghadar
Keyword(s):  
Experimental Study ◽  
Power Transformer ◽  
Load Condition ◽  
Noise Pollution ◽  
Sound Level ◽  
Measurement Scale ◽  
Dominant Factor ◽  
Public Attention ◽  
Level Measurement ◽  
Human Ear

Increasing environment noise pollution is a matter of great concern and of late has been attracting public attention. Sound produces the minute oscillatory changes in air pressure and is audible to the human ear when in the frequency range of 20Hz to 20 kHz. The chief sources of audible sound are the magnetic circuit of transformer which produces sound due to magnetostriction phenomenon, vibration of windings, tank and other structural parts, and the noise produced by cooling equipments. This paper presents the validation for sound level measurement scale, why A-weighted scale is accepted for sound level measurement, experimental study carried out on 10MVA Power Transformer. Also presents the outcomes of comparison between No-Load sound & Load sound level measurement, experimental study carried out on different transformer like - 10MVA, 50MVA, 100MVA Power Transformer, to define the dominant factor of transformer sound generation.

Fire Risk Assessment of Composite Materials in Aviation by Hazard Levels Characterized in Standard EN 45545

2020 ◽  
Vol 13 (5) ◽  
pp. 182
Author(s):  
Stanislav Szabo ◽  
Iveta Vajdova ◽  
Edina Jencova ◽  
Daniel Blasko ◽  
Robert Rozenberg ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Composite Materials ◽  
Fire Risk ◽  
Fire Risk Assessment ◽  
Hazard Levels

TRANSFORMASI DESAIN RUMAH TINGGAL DI PERUMAHAN PADMA RESIDENCE (BANTUL, YOGYAKARTA) SAAT DITEMPATI

2017 ◽  
Vol 11 (3) ◽  
pp. 225
Author(s):  
Gabriella Calista Agnes
Keyword(s):  
Data Analysis ◽  
Field Survey ◽  
Present Condition ◽  
Dominant Factor ◽  
Literature Study ◽  
Causal Factors ◽  
Architectural Elements ◽  
Initial Design ◽  
Dining Room ◽  
Physical Changes

Abstract: A house is a basic need for every human’s life. It is not only a place for shelter, but also a place for a family to live, to have social interaction between them, to raise the children, and to give the values of life. Padma Residence is a modern residence which is built by PT. Surya Coco Jaya. Most of its residents make changes to their houses after they occupy it. The main purpose of this study is to observe changes toward the initial design by comparing the initial design and present condition, recording the present condition of the house when it has occupied by determine architectural elements which are changed, determining causal factors of changes, and finding out dominant causal factors toward alteration of architectural elements of the house at Padma Residence, Bantul, Yogyakarta while it is occupied. Methods used in data collecting are literature study and a field survey. A field survey includes observation, interview, and distributing questionnaires to 25 respondents who are the owners of houses in this residence. Data analysis used table which compare the initial design and nowadays condition. The result of data processing and analyzing reveals that the owners do physical changes at their houses while they occupy them, particularly at the front appearance of the house. The changes include the addition of canopies at carport and changes in the layout of the rooms, such as kitchen, dining room, and backyard. A dominant factor which has caused those changes is the function of rooms which is added to the house.Keywords: residence, physical changes, the additon of functionAbstrak : Rumah merupakan kebutuhan utama bagi kehidupan setiap manusia. Selain sebagai tempat untuk berlindung, rumah juga merupakan wadah atau tempat manusia atau sebuah keluarga melangsungkan kehidupannya. Perumahan Padma Residence merupakan sebuah hunian modern yang dibangun PT. Surya Coco Jaya dan sebagian besar penghuninya melakukan perubahan pada rumah tinggalnya saat ditempati. Tujuan utama penelitian ini adalah mengetahui perubahan terhadap desain awal rumah tinggal dan kondisi rumah tinggal tersebut saat ditempati dengan mengetahui unsur-unsur arsitektural yang berubah pada desain rumah tinggal saat ditempati di Perumahan Padma Residence, Bantul, Yogyakarta. Metode penelitian dilakukan dengan studi literatur dan survei lapangan. Survei lapangan meliputi pengamatan, wawancara, dan penyebaran kuesioner kepada 25 responden yang merupakan pemilik rumah tinggal di perumahan tersebut. Hasil dari pengolahan dan analisis data menunjukkan bahwa pemilik rumah melakukan perubahan fisik pada rumah tinggalnya saat ditempati, terutama pada tampilan depan bangunan, perubahan yang dilakukan adalah menambahkan kanopi pada carport, peletakan ruang seperti dapur, ruang makan, dan taman belakang. Faktor-faktor yang menjadi penyebab perubahan tersebut adalah pertambahan fungsi ruang.Kata kunci: rumah tinggal, perubahan fisik, pertambahan fungsi

ANALYSIS OF FLOOD PRONE AREAS IN NAGAN RAYA REGENCY ACEH PROVINCE

2020 ◽  
Vol 5 (1) ◽  
pp. 414
Author(s):  
Amsar Yunan
Keyword(s):  
Land Use ◽  
Spatial Data ◽  
Flood Hazard ◽  
Parameter Analysis ◽  
Thematic Maps ◽  
Aceh Province ◽  
Object Area ◽  
Use Factors ◽  
Hazard Levels ◽  
Flood Prone Areas

Maps or remote sensing can be interpreted as the process of reading using various sensors where data collected remotely can be analyzed to obtain information about the object, area or phenomenon. In this study, the author develops a flood disaster mapping information system applying overlays with scoring between the parameters. The determinant factors to provide flood hazard levels includes rainfall factors in the dasarian unit, land-use factors and land-use arbitrary factors. Of all these parameters, a scoring process will be carried out by assigning weights and values according to their respective classifications, then an overlay process will be performed using ArcGIS software. The author conducted this study in Nagan Raya Regency since this area experiences flooding annually.  Framing a thematic map of flood-prone areas in Nagan Raya Regency was designed using the flood hazard method. Spatial data that has been presented in the form of thematic maps as parameters are land use maps, landform maps, and dasarian rainfall maps (per 10 daily). The design of thematic maps that are prone to flooding is done by overlapping (overlay process). In contrast, the determination of the classification is done by adding scores to each parameter, with low, medium and high hazard levels. Parameter analysis shows the level of flood vulnerability in Nagan Raya Regency of each district, namely Beutong: high 0.21%, medium 13.68%, low 86.12%. Seunagan District: high 51.17%, medium 48.83%, low 0%. Seunagan Timur District: high 10.07%, medium 46.18%, low 43.75%. Kuala Subdistrict: high 29.66%, medium 68.99%, low 1.35%. Darul Makmur District: high 8.57%, medium 63.37%, low 28.06%. From the overall results of the study, it can be concluded that the danger of flooding in Nagan Raya Regency with a level of vulnerability: high 9.92%, moderate 42.65% and low 47.43%.

STUDENTS INTEREST IN CONTINUING PROFESSIONAL EDUCATION NURSES IN HEALTH EDUCATION INSTITUTIONS IN BANYUMAS

2018 ◽  
Vol 2 (1) ◽  
pp. 14
Author(s):  
Rahmaya Nova Handayani ◽  
Adiratna Sekarsiwi
Keyword(s):  
Nursing Education ◽  
Health Education ◽  
Support System ◽  
Professional Education ◽  
Continuing Professional Education ◽  
Health Science ◽  
Dominant Factor ◽  
Student Interest ◽  
Cross Sectional ◽  
System Method

Introduction. Types of nursing education in Indonesia are vocational, academic and professional. Professional education is higher education after an undergraduate program that prepares students to have jobs with specific skill requirements. The purpose of this study was to identify factors that affect student interest in continuing professional education nurses based on perception, motivation and support system. Method. The study design was a descriptive analytic cross-sectional approach. Unstratified sampling using random sampling with a sample of 111 respondents in health education institutions in karisidenan Banyumas, there are Harapan Bangsa Purwokerto Institute of Health Science, Purwokerto Muhammadiyah University, Jenderal Sudirman University.Data was analysed by using multivariate logistic regression. Results. The results of the study showed that no correlation  perception, motivation, and support system of nurses Profession election interest in health education institutions in-karisidenan Banyumas (p=0,999; 0,956; 0,135).Discussion. The most dominant factor affecting the interest of the nurse profession was support system.Keywords: interest, perception, motivation, support system, professional nurses

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