The Method of Calculation of Building Structures by Reliability Level

2020 ◽  
Vol 786 (11) ◽  
pp. 54-59
Author(s):  
Yu.A. BELENTSOV ◽  
Keyword(s):  
Strength Class ◽  
Probability Of Failure ◽  
Reliability Theory ◽  
Building Structures ◽  
Design Quality ◽  
Method Of Calculation ◽  
Reliability Level ◽  
Modulus Of Deformation ◽  
Design Construction

The analysis of the problem of calculating the bearing capacity of structures, taking into account the guaranteed level of reliability and failure-free operation, was carried out. On the basis of the works of N. N. Streletsky, A. R. Rzhanits and others, bottlenecks are established that do not make it possible to design structures with a guaranteed level of reliability and failure-free operation, despite the introduction of the concept of strength class and the existing reliability theory. According to the failure-free operation indicator, a scheme for normalizing the reliability of designed building structures is proposed and is interrelated with the assessment of the quality of structures being built. Guaranteed design quality indicators with a set probability of failure-free operation that are not related to strength are introduced: geometric dimensions, modulus of deformation and elasticity, taking into account the variability of properties and technology. The corresponding reserve coefficients ensuring the required probability of failure-free operation are determined. The scheme for calculating the design of structures with the required level of reliability is developed in the process of design, construction and operation of structures, taking into account the completeness and reliability of information on the results of quality control, during operation, taking into account the reduction of physical, mechanical and other properties of structures.

Optimization for Spindle of Jade Carving Machine Based on Fuzzy Reliability Theory

2010 ◽  
Vol 37-38 ◽  
pp. 801-805
Author(s):  
Huai Rong Shi ◽  
Yan Nian Rui
Keyword(s):  
Reliability Theory ◽  
Fuzzy Reliability ◽  
Design Quality ◽  
Combined Model ◽  
Mechanical Process ◽  
Fuzzy Variables ◽  
Mechanical Products ◽  
Machine Spindle ◽  
Full Consideration

In machines working under the effect of alternating stresses, the fatigue bending deflection occured occasionally. On the basis of the Fuzzy Reliability Theory and with full consideration of the fuzzy factors during mechanical process, the paper studied the fuzzy reliability optimal design for the hollow spindle of multi-functional jade carving machine and improved the design quality of the jade carving machine spindle by probing into the combined model constructed by the random variables and fuzzy variables. The design was approved to be advanced, reliable and practical in service and provided a new way for the design of multifunctional jade carving machine spindle and other mechanical products.

scholarly journals DETERMINATION OF THE PROBABILITY OF SYSTEM DESTRUCTION "LOOSE BODY - CONSTRUCTION" AGAINST SHIFT

2021 ◽  
Vol 3 (163) ◽  
pp. 2-6
Author(s):  
Khalife Rabih
Keyword(s):  
Monte Carlo ◽  
Statistical Method ◽  
Statistical Tests ◽  
Retaining Wall ◽  
Loose Body ◽  
Probability Of Failure ◽  
Probabilistic Methods ◽  
Building Structures ◽  
Body Structure ◽  
Method Of Calculation

The need for modern science-intensive models for assessing the reliability of building structures, and especially the system "loose body – structure" is now very acute due to the fact that such an assessment has become mandatory in the design. The existing gap is the lack of algorithms for determining the reliability of a complex system and is intended to fill this study. The aim of the article is to develop a method for determining the probability of failure of the system "bulk body – structure" against displacement using the method of statistical tests (Monte Carlo). To determine the probability of stability of the retaining wall against displacement, it is proposed to use the method of statistical tests using the accepted normative method of calculation. According to this method, it is necessary to perform N statistical tests, for each of which we will perform calculations according to the algorithm described in the article. A method for determining the probability of failure of the system "loose body – structure" against the shift by the statistical method of Monte Carlo. A test example was performed in the Mathcad environment. Calculations were performed to determine the probability of failure of the system "loose body – structure" against the shift by the statistical method of Monte Carlo. It was found that the value of the probability of failure of the system "loose body – structure" against the shift over the base service life may be in the range of 1x10-5… 1x10-3. It would also be interesting to use probabilistic methods to develop algorithms for the probability of failure of retaining walls due to loss of bearing capacity of the soil base, strength of the rock base, loss of strength of structural elements and joints, as well as the probability of exceeding the deformation of the base.

scholarly journals Calculation of building structures and features of its automation technology

2019 ◽  
Vol 1 (52) ◽  
pp. 70-74
Author(s):  
Oleksandr Shkurupiy ◽  
Pavlo Mytrofanov ◽  
Andrii Pashchenko ◽  
Ivan Kozichko
Keyword(s):  
Statistical Modeling ◽  
Reliability Theory ◽  
Software Systems ◽  
Building Structures ◽  
Mathematical Methods ◽  
Industrial Facilities ◽  
Construction Mechanics ◽  
Automation Technology

Recently, the issues of evaluating the quality of building structures and predicting their reliability are becoming increasinglyimportant, especially for the construction of industrial facilities of the old fund. Powerful mathematical methods are beingdeveloped to evaluate the performance of structures and predict their reliability, but there are no automated computer systemsfor such analysis. At present, programs for the determined calculation of structures have been developed, which implementmethods for the resistance of materials, theoretical and construction mechanics, but they do not provide an opportunity to determineand predict reliability, especially objects of the old fund. The methods of the classical reliability theory combinedwith the methods of statistical modeling are used in the work, which requires the use of modern IT technologies methodswith the development of appropriate software systems

Urban stormwater: the analysis of the failure of the alternative techniques and the management of quality

1995 ◽  
Vol 32 (1) ◽  
pp. 33-39
Author(s):  
E. Alfakih ◽  
S. Barraud ◽  
Y. Azzout ◽  
B. Chocat
Keyword(s):  
Stormwater Management ◽  
Difficult Problem ◽  
Management Approach ◽  
Alternative Technique ◽  
Urban Stormwater ◽  
Urban Stormwater Management ◽  
Porous Pavement ◽  
Alternative Techniques ◽  
Design Construction

The implementation of alternative techniques in urban stormwater management is a difficult problem in terms of choice, design, construction, and operating. We applied a quality management approach to try and have a better understanding of these techniques. The quality of an alternative technique in urban stormwater management is defined; the factors that lead to failures were identified and analysed. In order to reduce these factors, tools were developed, and measures that allow the achievement of the necessary standard of quality are suggested. In this article, all the illustrations refer to the porous pavement technique.

The Selection Evaluation of Design Bidding

2014 ◽  
Vol 501-504 ◽  
pp. 2638-2641 ◽  
Author(s):  
Peng Cheng Pan ◽  
Yanan Shao ◽  
Huan Liu
Keyword(s):  
Index System ◽  
Evaluation Index System ◽  
Evaluation Index ◽  
Design Teams ◽  
Design Quality ◽  
Quality Cost ◽  
Quality Design

The quality of the project depends firstly on the design. Selected excellent design units can help the owner to realize the projects quality, cost and schedule target. The principles of the evaluation in design bidding were discussed in this paper. The design quality, design fees quotation, design teams service commitments, design teams ability, design institutions strength, and design institutions reputation were given as the six aspects of evaluation index system. last, the organization of evaluator was discusses.

Modal Analysis and Optimization of Spindle Box of Turn-Milling Center Based on Finite Element Method

2012 ◽  
Vol 226-228 ◽  
pp. 281-284
Author(s):  
Li Da Zhu ◽  
Xiao Bang Wang ◽  
Tiao Biao Yu ◽  
Wan Shan Wang
Keyword(s):  
Finite Element ◽  
Natural Frequencies ◽  
Element Model ◽  
Ansys Software ◽  
Design Requirement ◽  
Design Quality ◽  
Machining Center ◽  
Main Components ◽  
Turn Milling

The dynamic characteristics of machine tool may directly affect its machining capability, which is analyzed to improve the machining precision and efficiency. In this paper, the 3D finite element model of main components turn-milling center is established by using ANSYS software, and then spindle box of turn-milling center is analyzed and optimized; the natural frequencies and vibration models are obtained after analysis, which guarantee the design requirement of the machining center. Therefore it is significant to improve the design quality of machining center by using FEA software in the design process.

Multi-criteria Web Services Selection: Balancing the Quality of Design and Quality of Service

2022 ◽  
Vol 22 (1) ◽  
pp. 1-31
Author(s):  
Marwa Daaji ◽  
Ali Ouni ◽  
Mohamed Mohsen Gammoudi ◽  
Salah Bouktif ◽  
Mohamed Wiem Mkaouer
Keyword(s):  
Quality Of Service ◽  
Web Services ◽  
Web Service ◽  
State Of The Art ◽  
Service Selection ◽  
Service Design ◽  
Design Quality ◽  
Trade Off ◽  
Selection Approach

Web service composition allows developers to create applications via reusing available services that are interoperable to each other. The process of selecting relevant Web services for a composite service satisfying the developer requirements is commonly acknowledged to be hard and challenging, especially with the exponentially increasing number of available Web services on the Internet. The majority of existing approaches on Web Services Selection are merely based on the Quality of Service (QoS) as a basic criterion to guide the selection process. However, existing approaches tend to ignore the service design quality, which plays a crucial role in discovering, understanding, and reusing service functionalities. Indeed, poorly designed Web service interfaces result in service anti-patterns, which are symptoms of bad design and implementation practices. The existence of anti-pattern instances in Web service interfaces typically complicates their reuse in real-world service-based systems and may lead to several maintenance and evolution problems. To address this issue, we introduce a new approach based on the Multi-Objective and Optimization on the basis of Ratio Analysis method (MOORA) as a multi-criteria decision making (MCDM) method to select Web services based on a combination of their (1) QoS attributes and (2) QoS design. The proposed approach aims to help developers to maintain the soundness and quality of their service composite development processes. We conduct a quantitative and qualitative empirical study to evaluate our approach on a Quality of Web Service dataset. We compare our MOORA-based approach against four commonly used MCDM methods as well as a recent state-of-the-art Web service selection approach. The obtained results show that our approach outperforms state-of-the-art approaches by significantly improving the service selection quality of top- k selected services while providing the best trade-off between both service design quality and desired QoS values. Furthermore, we conducted a qualitative evaluation with developers. The obtained results provide evidence that our approach generates a good trade-off for what developers need regarding both QoS and quality of design. Our selection approach was evaluated as “relevant” from developers point of view, in improving the service selection task with an average score of 3.93, compared to an average of 2.62 for the traditional QoS-based approach.

Calibration of reliability-based safety factors for sand boiling in excavations

2020 ◽  
Vol 57 (5) ◽  
pp. 742-753
Author(s):  
Ignatius Tommy Pratama ◽  
Chang-Yu Ou ◽  
Jianye Ching
Keyword(s):  
Factor Of Safety ◽  
Probability Of Failure ◽  
Reliability Theory ◽  
Design Codes ◽  
Test Results ◽  
Safety Factors ◽  
Target Probability ◽  
Analysis Methods ◽  
Actual Factor ◽  
The Relationship

This study calibrated the required factors of safety of five analysis methods for sand boiling using reliability theory. The factors of safety computed by the five analysis methods were compared with the results of a series of sand boiling model tests. The comparison shows that rigorous methods (Terzaghi’s and Harza’s methods) were more accurate in predicting the factors of safety compared to the simplified methods (Harr’s, simplified Terzaghi’s, and simplified Harza’s methods). The statistics of the model factor for each method, defined as the actual factor of safety divided by the computed one, was calibrated by the model test results. These statistics were then used to establish the relationship between the target probability of failure and the required factor of safety by reliability theory. Verification using a full-scale sand boiling case history shows that the required factor of safety calibrated by the reliability theory was more reasonable than the required factors of safety in references and design codes.

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