FATIGUE ASSESSMENT OF SHIP SUPERSTRUCTURE AT EXPANSION JOINT

Despite the long history of application of subdivided superstructures and deckhouses, and efforts of ship designers and researchers a sensible solution in design of reliable details at the cut endings was not found yet. It may be explained as consequence of controversial requirements in design of the cut endings. Fatigue design of the superstructure details is addressed to solution of the problem. Presented is an example of fatigue design of the cut ending in a fast ship superstructure based on application of modified «Strain-Life» criterion for fatigue and subsequent approach which utilizes Neuber’s formula and material cyclic properties. To realize the approach a procedure of the long-term stress distribution transformation to the block-type format is developed. Efficiency of the developed technique is illustrated by comparing the results with those of application standard S-N criteria based techniques. The results of analysis allowed selection of the expansion joint detail of the superstructure geometry and construction procedure providing necessary reliability.

Analysis of Geogrid Reinforced Structures with a Passive Facing System Using Different Computational Methods

The article deals with designing and analysing a wrapped geogrid reinforced structure (GRS) with a passive facing system. The analysis has been done using analytical calculation and numerical modelling. The analytical calculations were executed using FINE Geo5 geotechnical software, and numerical modelling was executed using Plaxis 2D software. The analysis is focused mainly on comparing tension forces in geogrids and the stability of the reinforced embankment determined using both computational methods. The deformation analysis was done only using numerical modelling. The numerical modelling allowed for a more detailed analysis of the wrapped GRS. Each construction phase was modelled step by step according to an actual construction procedure. Two complex road embankments supported by GRS were modelled and analysed. The first model consisted of three GRS, which not affected each other. In the second model, the GRS at each side of the embankment influenced each other. The analysis results showed that tension forces in geogrids, determined using both computational methods, can differ significantly from each other. The stability of the reinforced embankment determined using numerical modelling was within the range of 0.87 – 1.22 of the stability determined using analytical calculation. The numerical modelling results showed that the final horizontal deformation of the passive facing is about 2.8 – 3.8 times smaller than the deformation of the wrapped GRS, which occurs during the construction of the embankment.

Novel Construction of Copulas Based on ( α , β ) Transformation for Fuzzy Random Variables

The paper introduces a method for the construction of bivariate copulas with the usage of specific values of the parameters α and β ( α , β transformation) and the parameters κ and λ in their domain. The produced bivariate copulas are defined in four subrectangles of the unit square. The bounds of the produced copulas are investigated, while a novel construction method for fuzzy copulas is introduced, with the usage of the produced copulas via α , β transformation in four subrectangles of the unit square. Following this construction procedure, the production of an infinite number of copulas and fuzzy copulas could be possibly achieved. Some applications of the proposed methods are presented.

HIGH STRENGTH CONCRETE USING PURIFIED FLY ASH

For the shelter requirements of widely spreading population civil industry also spreading enormously. With different and advanced construction techniques numbers of materials used in this construction procedure are also developed and used in general practice. Cement is base product for every type of construction. It is made from natural material with special factory procedure. This cement or cementitious material has strength up to 53 MPa. But while practicing higher grade concretes which has strength more than 65 MPa we have to use some special processed material mixture with cement. During this material study we have to use material purified fly ash. This fly ash possess some good qualities like extra silica percentage, more fine and better surface area. So it is better option than factory waste fly ash and silica fume to achieve desired strength of concrete. With different trial mixes we can use it in general practice.

Benefits of Project Management to Realizing Sustainable Buildings

Sustainable materials are becoming popular worldwide in terms of ecologically friendly structures that deal with pollution controls, climate change, global temperature increase, and resource conservation issues. Consequently, the researchers believe that simply using sustainable materials to design and create a building is insufficient. This article discusses several elements of sustainable construction planning including site choice mostly through the proposed project, material classification mostly through the life cycle, analysis time, cost, and commodity controls, reliability and stability, occupant health, manufacturing methodologies and procedures, and design concepts based on advanced ideas. The article argues that by integrating the choice of building components and construction strategic planning practices into the project, the productivity and consequently the reliability of the building could be significantly improved. The article also discusses the advantages and requirements of sustainable construction, the managerial roles in construction procedure, management processes, and a correlation of conventional construction planning and sustainable project management. The research paper indicates that the objective of constructing an environmentally friendly building is simply fully done when the notion of sustainability is integrated into every phase of the construction approach and that the procedures are not restricted to using recycled practices.

Comments on one- versus two-stage procedure for transposed brachio-basilic arteriovenous fistulae

The maturation and long-term patency of transposed brachio-basilic arteriovenous fistulae can best be achieved not by adopting a two-stage construction procedure, but by using a loop configuration and an anastomosis angle that allows for the most favorable flow dynamics.

Habermasian Constructivism: An Alternative to the Constitutivist Argument

Jürgen Habermas’ discourse theory of morality should be understood, in metaethical terms, as a constructivist theory. All constructivist theories face a Euthyphro-like dilemma arising from how they classify the constraints on their metaethical construction procedures: are they moral or non-moral? Many varieties of Kantian constructivism, such as Christine Korsgaard’s, classify the constraints as moral, albeit constitutive of human reason and agency in general. However, this constitutivist strategy is vulnerable to David Enoch’s ‘shmagency’ objection. The discourse theory of morality, by classifying the constraints on the metaethical construction procedure (principles (D) and (U)) as non-moral, can avoid this problem.

Output-Only Damage Detection in Plate-Like Structures Based on Proportional Strain Flexibility Matrix

For engineering structures, strain flexibility-based approaches have been widely used for structural health monitoring purposes with prominent advantages. However, the applicability and robustness of the method need to be further improved. In this paper, a novel damage index based on differences in uniform load strain field (ULSF) is developed for plate-like structures. When estimating ULSF, the strain flexibility matrix (SFM) based on mass-normalized strain mode shapes (SMSs) is needed. However, the mass-normalized strain mode shapes (SMSs) are complicated and difficult to obtain when the input, i.e., the excitation, is unknown. To address this issue, the proportional strain flexibility matrix (PSFM) and its simplified construction procedure are proposed and integrated into the frames of ULSF, which can be easily obtained when the input is unknown. The identification accuracy of the method under the damage with different locations and degrees is validated by the numerical examples and experimental examples. Both the numerical and experimental results demonstrate that the proposed method provides a reliable tool for output-only damage detection of plate-like structures without estimating the mass-normalized strain mode shapes (SMSs).