Lifetime-Oriented Structural Design Concepts- P4 pptx

... T. Bruhns · Dietrich Hartmann Rüdiger Höffer · Detlef Kuhl Günther Meschke (Eds.) Lifetime-Oriented Structural Design Concepts ABC XVI Contents 3.3.4.2.10 Finite ElementCalculations of the (Reduced)Static ... representing the fields of structural engineering, structural mechanics, soil mechanics, material sci- ence, and numerical mathematics introduced a research program on “lifetime...

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... research Integrated design concepts Appropriate Quality Assurance for structural design, detailing and execution QA is a very important overhead necessity, also for lifetime-oriented design concepts, ... Fundamentals of Lifetime-Oriented Design 7 lifetimes. The progress in lifetime-oriented design concepts can contribute to an international harmonization of warranty law. 1.5...

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... considered for realistic lifetime oriented design concepts especially with regard to the fatigue damage of structures and structural members. The basis of such design concepts is the realistic modelling ... Bridges Authored by Gerhard Hanswille For a realistic lifetime oriented design especially with regard to the fatigue damage of structures and structural members realistic models...

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... numbers N T o of lorries during the design life assumed for λ 2 = 1.0. Therefore the factor differs for structures and structural members with different materials (e.g. structural steel, reinforcement, ... traffic category 2 in Table 3.14. Furthermore for the design life a reference value T so = 100 years was assumed. In case of another traffic category or design life the damage equivalen...

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... the design as long as the train speed is sufficiently below the critical. If however the critical speed is lower than the maximal track speed, resonant amplification will provide the dominant design ... Pattern for Static and Dynamic Design Calculations The following expression summarizes the observed effects and may be applied to static and in particular to dynamic design calculations: q...

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... shallow foundations side by side) and different loadings arising from the superstructure design (despite design efforts to avoid this). 108 2 Damage-Oriented Actions and Environmental Impact Fig. ... yield strength undergo progressive, localized, and permanent structural changes, i.e. also in these materials fatigue takes place. The structural change thus can be described on the macrosc...

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... loading (Subsections 3.2.1.2 and (Subsections 3.2.2) and structural experiments of steel-concrete composite structures (Subsection 3.2.3). 3.2.1 Laboratory Testing of Structural Materials Authored by Otto T. ... envi- ronmentally induced degradation mechanisms, which led to a better under- standing of the microstructural mechanisms and to analysis tools to simulate the relevant processes....

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... interval between the maximum amplitude of the burst and the last threshold crossing. • event: A microstructural displacement that produces elastic waves in ma- terial under load or stress, which are ... Therefore, the reliability of such structures depends among other influences also on the degree of structural degradation due to fatigue loading. In order to estimate the state of a structure...

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... earthquake loading (Section 3.4), which represents a typical loading scenario that may lead to structural failure induced by low cycle fatigue at highly stressed locations of the structures. 3.3.1.2.1.1 ... mesh dependency of the simulation results due to localisation. The equation for the Rankine damage potential for the tensile domain reads φ t,i (σ, ζ t )=ξ i (σ, ζ t ) −f ct ≤ 0 , (3.69)...

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... the continuum and the structural level. This can be explained as follows. Using one element over the thickness practically means to work with a one-directior shell theory. We are then at the structural ... contrast to many earlier approaches we do not have to neglect the stress in thickness direction at the structural level. [773], [774] and [776] propose an implicit residual error esti...

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... distributed loads single axle infrequent design situations 0,8 0,8 0,8 frequent design situations 0,75 0,4 0,75 quasi permanent design situations 0 0 0 bridge design. As mentioned above the load ... numbers N T o of lorries during the design life assumed for λ 2 = 1.0. Therefore the factor differs for structures and structural members with different materials (e.g. structura...

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... this sudden release of elastic energy due to micro-fracture events are of most interest to the structural engineer. These events are typically 10μm to 100μm in linear dimension. Sources of acoustic ... emission examination is a nondestructive testing method with demonstrated capabilities for monitoring structural integrity, detecting leaks and incipient failures in mechanical equipment. A...

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... 772], implies, that the degradation of concrete caused by ASR is mainly induced by structural effects. These structural effects may result from hindered deformations due to geometrical constraints ... more or less heuristic evaluations of the degradation process and its influence on the residual structural safety. Recent progress in computational durability mechanics (see e.g. [75, 211, 80...

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Ngày tải lên: 01/07/2014, 11:20

... changes in the damaged state. 4.6 Application of Lifetime-Oriented Analysis and Design 575 Fig. 4.120. FE model of the shaker test arrangement 4.6.2.3.1 Structural Analysis Using Time Integration Time ... long-term research in lifetime-oriented analysis and de- sign is the most essential achievement and the best possible evidence for work 4.6 Application of Lifetime-Oriented Analysi...

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