Probability Assessment Method for Bearing Capacity of Existing RC Bridge

2011 ◽  
Vol 243-249 ◽  
pp. 1743-1749
Author(s):  
Lei Yan ◽  
Ying Zhao Lü
Keyword(s):  
Bearing Capacity ◽  
Reliability Index ◽  
Evaluation Method ◽  
Probability Model ◽  
Highway Bridges ◽  
Assessment Method ◽  
Probability Assessment ◽  
Action Effect ◽  
Beam Bridge ◽  
Assessment Result

The capacity of existing RC bridge could decay slowly when exposed to the aggressive environments. In this paper, the probability assessment method was presented. And the probability model of dead effect and vehicle action effect was established. The classification principle of bearing capacity was presented on the basis of reliability index; furthermore, the evaluation method was presented by a lot of calculation about the reliability index and the ratio of vehicle action effect to dead effect. An existing RC beam bridge with 34 years was evaluated; the technology condition is third class according to code for maintenance of highway bridges and culvers (JTG H11-2004). The checking index is 0.947 and the assessment result is also third grade. Comparing of the results indicated that the method is practical and convenient.

scholarly journals Team Collaboration Assessment Method in Marine Engine Room Simulator

2021 ◽  
pp. 315-332
Author(s):  
Hui Cao ◽  
Keyword(s):  
Evaluation Method ◽  
Similarity Theory ◽  
Fuzzy Comprehensive Evaluation ◽  
Assessment Method ◽  
Task Completion ◽  
Weighting Method ◽  
Team Collaboration ◽  
Engine Room ◽  
The Impact ◽  
Assessment Result

Based on the fuzzy mathematics and set similarity theory an intelligent collaboration assessment method for engine room simulator was studied. First, an integrated weighting method using both subjective and objective information was designed to obtain the weight vector; second, the fuzzy comprehensive evaluation method was used to calculate the completion degree of team collaboration, then the Dice coefficient and the Tversky coefficient were adopted to quantify the sequence factor, interactivity factor, redundancy factor and unauthorized factor of team collaboration effectiveness; third, a comprehensive calculation was achieved by the completion degree and the four factors to get the team collaboration assessment result; finally, the influence of the collaboration factors on assessment result was analyzed by an example, and it was found that even if the team get a higher task completion degree, due to some factors, the score is still low. The research shows that the collaborative performance of a team can greatly influence the final assessment result, the quantitative analysis of team collaboration can more objectively reveal the impact on collaboration. It is an effective method to add the influence of team cooperation factors to the traditional individual evaluation.

Research on Oil Depot Safety Evaluation Based on Dow Chemical Fire and Explosion Index Assessment Method

2013 ◽  
Vol 748 ◽  
pp. 1256-1261
Author(s):  
Shou Hui He ◽  
Han Hua Zhu ◽  
Shi Dong Fan ◽  
Quan Wen
Keyword(s):  
Production Management ◽  
Evaluation Method ◽  
Risk Index ◽  
Safety Evaluation ◽  
Assessment Method ◽  
Theoretical Ground ◽  
Potential Hazard ◽  
Process Unit ◽  
Safety Production ◽  
Fire And Explosion

At the present time, the Dow Chemical Fire and Explosion Index (F&EI) is a kind of risk index evaluation method that is comprehensively used in evaluating potential hazard, area of exposure, expected losses in case of fire and explosion, etc. As the research object to oil depot storage tank area, this article ultimately confirms establishing appropriate pattern of process unit as well as reasonable safety precautions compensating method, in order to insure the reasonableness of evaluating result, by means of selecting process unit, confirming material factor and compensating safety precautions, using F&EI method. This can provide the basis for theoretical ground in aspect of oil depot development and safety production management.

Some Important Issues on First-Order Reliability Analysis With Nonprobabilistic Convex Models

2014 ◽  
Vol 136 (3) ◽  
Author(s):  
C. Jiang ◽  
G. Y. Lu ◽  
X. Han ◽  
R. G. Bi
Keyword(s):  
Reliability Analysis ◽  
Reliability Index ◽  
Probability Model ◽  
Mean Value ◽  
Convex Model ◽  
First Order ◽  
Reliability Method ◽  
Complex Engineering ◽  
Mean Value Method ◽  
Form Type

Compared with the probability model, the convex model approach only requires the bound information on the uncertainty, and can make it possible to conduct the reliability analysis for many complex engineering problems with limited samples. Presently, by introducing the well-established techniques in probability-based reliability analysis, some methods have been successfully developed for convex model reliability. This paper aims to reveal some different phenomena and furthermore some severe paradoxes when extending the widely used first-order reliability method (FORM) into the convex model problems, and whereby provide some useful suggestions and guidelines for convex-model-based reliability analysis. Two FORM-type approximations, namely, the mean-value method and the design-point method, are formulated to efficiently compute the nonprobabilistic reliability index. A comparison is then conducted between these two methods, and some important phenomena different from the traditional FORMs are summarized. The nonprobabilistic reliability index is also extended to treat the system reliability, and some unexpected paradoxes are found through two numerical examples.

scholarly journals Power supply risk assessment method for relay protection system faults

2016 ◽  
Vol 65 (4) ◽  
pp. 803-814
Author(s):  
Si Tuyou ◽  
Wu Jiekang ◽  
Yuan Weideng ◽  
Du Anan
Keyword(s):  
Power Supply ◽  
Distribution Systems ◽  
Probability Model ◽  
Relay Protection ◽  
Assessment Method ◽  
Protection System ◽  
Supply Risk ◽  
Load Power ◽  
Risk Assessment Method ◽  
Protection Systems

Abstract The influence and the potential risk due to hidden faults of a relay protection system on power supply in distribution systems are paid more and more attention to. A probability analysis method is used to analyse fault characteristics and action mechanism of dominant faults, hidden misoperation and non-operation of the relay protection systems, and failure probability model of relay protection system is constructed and simplified. The effects of dominant faults, hidden misoperation and non-operation of the relay protection systems on the reduced power supply load power are analysed, and a probabilistic model for reduced power supply load power is constructed by three parts corresponding to dominant faults, hidden misoperation and non-operation. A probability calculation method of power supply risk occurrence due to hidden faults of relay protecttion system is proposed considering the fault probability of the relay protection systems, the frequency of the hidden faults occurring in operation period, the reduced power supply load power or load power outage, and the connection mode of the in-lines, out-lines and transformers in a substation. The feasibility and applicability of the proposed method for estimation of risk value probability of the relay protection systems is verified by two studied examples.

Proposal of a Simplified Environmental Assessment Method Based on Major Building Materials for School Buildings in Korea

2014 ◽  
Vol 905 ◽  
pp. 353-356
Author(s):  
Seung Jun Roh ◽  
Sung Ho Tae
Keyword(s):  
Environmental Impact ◽  
Impact Assessment ◽  
Environmental Impact Assessment ◽  
Building Materials ◽  
Assessment Method ◽  
School Buildings ◽  
Detailed Assessment ◽  
Impact Assessment Method ◽  
Assessment Result ◽  
Selection Of

The purpose of this study is to propose a simplified environmental impact assessment method based on selection of major building materials for school buildings in Korea. To accomplish this, environmental impact of 2 school buildings constructed in Korea was assessed according to the procedure of life cycle assessment. In addition, major building materials of school buildings were selected from the perspective of 6 environmental impact categories based on the assessment result, and a method of simplified environmental impact assessment was suggested. On one hand, case analysis verified applicability of the simplified environmental impact assessment method proposed in this study by showing similar value within 10% compared to the assessment result from existing detailed assessment.

scholarly journals Possible Assessment Method of Green Infrastructure in the Case of Small Town Keszthely, Hungary

Land Science ◽  
2020 ◽  
Vol 2 (2) ◽  
pp. p21
Author(s):  
Vera Iváncsics ◽  
Krisztina Filepné Kovács
Keyword(s):  
Green Infrastructure ◽  
Environmental Planning ◽  
Evaluation Method ◽  
Assessment Method ◽  
Policy Implications ◽  
Current Status ◽  
Field Surveys ◽  
Further Development ◽  
The Eu

Recently the planning of green infrastructure (GI) has become a general practice around metropolis (Paris, München, Budapest, etc). A complex methodology is required that goes beyond the scope of traditional green surface systems. However, there are various policy implications in the EU, the smaller towns are lagging to apply them. The paper presents a potential evaluation method through the case study of Keszthely, HU. As Keszthely at Balaton Riviera, is a popular touristic target of CEE, the environmental planning is an essential part of sustainable development. After a literature analyses of assessment methods of GI and ecosystem services, the aspects of GI have been valued on grade scales, based on field surveys and indicators. The current status of the GI was surveyed which is a base for further development and monitoring activities. The paper introduces the methodology, which contributes to preservation of ecosystems.

scholarly journals Research on Anomalous Behavior Detection and Dangerousness Assessment among Civil Aviation Passengers at Checkpoints

2021 ◽  
Author(s):  
Haibin Shen ◽  
yan Zhang
Keyword(s):  
Neural Network ◽  
Index System ◽  
Evaluation Method ◽  
Assessment Method ◽  
Anomalous Behavior ◽  
Civil Aviation ◽  
Risk Level ◽  
Neural Network Method ◽  
Behavior Detection ◽  
Network Method

Abstract Traditional civil aviation security check measures are focused on baggage rather than passengers. The goal of this study is to enhance the level and effectiveness of security measures. We propose an anomalous behavior detection technique for civil aviation passengers and a passenger risk-assessment method based on a neural network method. A large number of real cases were analyzed and summarized to extract indicators of anomalous behavior of civil aviation passengers, and an index system was developed to detect anomalous behavior of passengers at checkpoints. A neural network method was used to evaluate the passengers and classify the risk level to detect potentially dangerous personnel, monitor people, and create an emergency warning system. The synthetic minority oversampling technique (SMOTE), the conjugate gradient method, and a multilayer perceptron neural network were used to classify the risk level of passengers at checkpoints. The results demonstrated that the proposed index system and evaluation method were well suited to deal with the ambiguity and uncertainty in the recognition process. The anomalous behavior of civil aviation passengers at checkpoints and the associated threat level were accurately identified.

scholarly journals Evaluasi Program Pembelajaran Sejarah Terintegrasi dalam Mata Pelajaran IPS Di SMPN 4 Kota Bekasi

2018 ◽  
Vol 7 (1) ◽  
pp. 1-28
Author(s):  
Kurniawati Kurniawati
Keyword(s):  
Social Studies ◽  
Secondary School ◽  
Evaluation Method ◽  
Assessment Method ◽  
Program Goal ◽  
Responsive Evaluation ◽  
History Learning ◽  
Implementation Assessment ◽  
Research Show ◽  
Three Components

This research explores the history learning which is integrated to IPS subject or also known as social studies at secondary school in SMPN 4 Kota Bekasi. The Method used in this research was evaluation method which employed responsive evaluation developed by Stake. Responsive evaluation by Stake used responsive clock as guided stages for evaluator. There were three components of evaluation following his earlier countenance model antecedent, transactions and outcomes. The things considered as antecedent were policy of the program, goal of the program, curriculum, book, means and infrastructure, and teacher’s competency. The things considered as transactions were lessons plan, instructional implementation, assessment, method and media of instructions. The results of the research show that there were several problems in the school related to program being evaluated, therefore several recommendation are given to IPS’s teacher, headmaster, government and also parents and community.   Penelitian ini bertujuan untuk mendeskripsikan pembelajaran sejarah yang terintegrasi dalam mata pelajaran IPS atau yang dikenal juga sebagai social studies di sekolah menengah pertama SMPN 4 Kota Bekasi. Metode yang digunakan dalam penelitian ini adalah metode evaluasi yang menggunakan model evaluasi responsive yang dikembangkan oleh Stake. Evaluasi responsive yang dikembangkan oleh Stake menggunakan responsive clock sebagai panduan bagi evaluator. Terdapat tiga komponen evaluasi mengikuti model countenance yang telah dikembangkan sebelumnya oleh   Stake   yaitu   komponen   antecedent,   komponen   transactions   dan   komponen outcomes. Termasuk komponen antecedent adalah kebijakan program, tujuan program, kurikulum, buku, sarana prasarana, dan kompetensi guru. Termasuk dalam komponen transactions adalah perencanaan pembelajaran, pelaksanaan pembelajaran, metode pembelajaran, media pembelajaran dan penilaian proses pembelajaran. Hasil penelitian menunjukkan bahwa terdapat beberapa masalah di sekolah berkaitan dengan program pembelajaran sejarah yang terintegrasi dalam   mata pelajaran IPS di SMP N 4 Kota Bekasi, sehingga beberapa saran diberikan kepada sekolah dan guru, MGMP, pemerintah, orang tua dan masyarakat.

scholarly journals Calculation of Ultimate Bearing Capacity of Pile Foundations of Highway Bridges under the Coupling of Steep Slope and Karst

2020 ◽  
Vol 198 ◽  
pp. 02017
Author(s):  
Zhongju Feng ◽  
Shaofen Bai ◽  
Wu Min ◽  
Jingbin He ◽  
Zhouyi Huang ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Pile Foundation ◽  
Highway Bridges ◽  
Ultimate Bearing Capacity ◽  
Steep Slope ◽  
Karst Area ◽  
Correction Coefficient ◽  
Finite Element Software ◽  
Calculation Results ◽  
Vertical Bearing

In order to study the influence of steep slope-karst coupling on the vertical bearing characteristics of pile foundation, the orthogonal simulation tests of pile foundation under 4 different roof thickness and 5 different slope are carried out by using Marc finite element software, and the correction coefficient of vertical partial bearing capacity of pile foundation according to roof thickness and slope is put forward. The test results show that when the thickness of the roof is more than 3 times the pile diameter, the ultimate bearing capacity of the pile foundation tends to be stable, and the value is about 19% when the slope is 45°; the ultimate bearing capacity of the pile foundation decreases gradually with the increase of the slope, and the reduction reaches 29.83% when the slope is greater than 45°. According to the calculation results, the variation law of vertical partial bearing capacity of pile foundation is analyzed, and the calculation formula of standard value of vertical ultimate bearing capacity of pile foundation in steep slope karst area considering both roof thickness and slope is put forward, and the correction coefficients αi and β are put forward.

Study on Reliability Evaluation Method of Existing CFST Arch Bridge

2012 ◽  
Vol 226-228 ◽  
pp. 1679-1682
Author(s):  
Yi Song Zou ◽  
Hai Tao Hou ◽  
Wei Peng
Keyword(s):  
System Reliability ◽  
Reliability Index ◽  
Evaluation Method ◽  
Reliability Assessment ◽  
Steel Tube ◽  
Arch Bridge ◽  
Cfst Arch Bridge ◽  
Arch Bridges ◽  
Grading Standards ◽  
Bridge System

Based on reliability theory, the application calculation method of Concrete Filled Steel Tube (CFST) arch bridge system reliability index is studied. Select the most unfavorable load distribution in working condition of maximum moment and deflection at the mid-span, from the angle of strain energy, calculated the weights of CFST arch ribs component. On the basis of the grading standards of reliability assessment of the existing bridge components and the critical structures, CFST arch bridge system reliability assessment grading standards are constructed. CFST arch bridges reliability index are evaluated from two aspects (the arch ribs and segment) in this article. As the CFST arch bridge locates in the marine environment, corrosion environment is the serious level of C5-M, steel pipe corrosion is the major diseases of CFST, arch rib which on the corrosion conditions were assessed. The results show that the method can effectively assess the situation of CFST arch bridge.

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