Lifetime-Oriented Structural Design Concepts- P19 docx

... 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...

Ngày tải lên: 01/07/2014, 10:43

... 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...

Ngày tải lên: 01/07/2014, 10:43

... 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...

Ngày tải lên: 01/07/2014, 10:43

... 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...

Ngày tải lên: 01/07/2014, 10:43

... 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...

Ngày tải lên: 01/07/2014, 10:43

... 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....

Ngày tải lên: 01/07/2014, 10:43

... 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...

Ngày tải lên: 01/07/2014, 10:43

... 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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... Materials It has been shown in Subsections 3.1.2.3, 3.1.2.3.2, 3.1.2.3.3, 3.1.2.2.2 that the main microstructural mechanisms of environamentally induced corrosion and deterioration processes are by now ... 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,...

Ngày tải lên: 01/07/2014, 10:43

... [mm] ~ 0.8 20.7 ~ 0.7 ~ 0.8 5.3 5.4 at the end of the numerical design life. However, it must be stated, that with the current design concepts cracks at the stud feet cannot be avoided. 3.3.4.2.8 ... value (5%-fractile) (J Mf,v = 1.0) curve 3: fatigue strength curve – design value (J Mf,v = 1.25) curve 1 65.76 4.1x10 6 } design codes m = 8 (tests S13_2) (tests S13_2) Fig. 3.163. Fa...

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... eliminate these nodes at the structural level by a static condensation technique to achieve a better condition of the matrices and a better perfor- mance at the structural level [245]. The number ... is indicated by the ratio of the total number of system nodes/dof. The structural efficiency and the combined fieldwise and structural efficiency for a truss structure is Eff u struc = NN u p,1...

Ngày tải lên: 01/07/2014, 10:43

... inter- faces have been developed within the scope of reduction methods for large structural dynamic models and the design of single dynamical components of challenging structures. These methods ... and [107]). An interesting approach of an explicit-implicit multi time step method for nonlinear structural dynamics which prescribes the continuity of velocities at the interface and uses a...

Ngày tải lên: 01/07/2014, 10:43

... the design of a numerical length scale, cf. [596]. The extension to higher order elements is straightforward. Applying the interpolation conditions and con- sidering the most general case, ϕ is designed ... fixed crack concept, no convergence problems occur now even in the post-peak regime. The resulting structural response is given in Figure 4.83. Finally, a numerical analysis based on a...

Ngày tải lên: 01/07/2014, 11:20

... inter- faces have been developed within the scope of reduction methods for large structural dynamic models and the design of single dynamical components of challenging structures. These methods ... popular model reduction method. The idea is to solve a subset of the 4.2 Numerical Methods 501 Structural Dynamics Modelling (FEM) Linear Components Nonlinear Components Model Reduction Subst...

Ngày tải lên: 01/07/2014, 11:20