Influence Of Support Conditions Research Articles

Influence of Support Conditions on Single-Span Profiled Sheet Metal Strength Through Nonlinear FEM Analysis

Profiled sheets are widely used in modern steel structures, either as cladding or as casing in composite structures. Strength calculation of such structures is a crucial design issue, and it represents a complex task because one must deal with thin-walled structures that have complicated cross-section shape. Manufacturers of these structural elements provide data about its strength, mostly based on experimental testing. However, catalogues provide little data about the supporting conditions at the ends that may have influence on structural strength. In this research, the finite element method analysis with geometrical and material nonlinearity and contact analysis in the support zones was applied for the strength calculation of a profiled steel sheet with very high depth. The analysis encompassed determination of the ultimate limit strength and serviceability limit strength with limited deflection. All analyses were conducted for surface load applied over the area of one sheet. Thereat, influence of several factors related to support conditions was considered: friction on the supports, support width, and number of fasteners. Failure mechanisms were also analysed. Obtained results were compared with other sources and methods, like analytical solution, manufacturer’s software, and catalogue data. Results of the research showed that behaviour and strength of those elements depend to the great extent on end support detailing, which cannot be encompassed by classical calculation methods and linear analysis. Significance of the support conditions was proven, and attention was paid on absence of such data in published catalogues.

Influence of Support Conditions on the Hydroelastic Behaviour of Floating Thick Elastic Plate

The hydroelastic response of very large floating structures (VLFS) under the action of ocean waves is analysed considering the small amplitude wave theory. The very large floating structure is modelled as a floating thick elastic plate based on Timoshenko-Mindlin plate theory, and the analysis for the hydroelastic response is performed considering different edge boundary conditions. The numerical study is performed to analyse the wave reflection and transmission characteristics of the floating plate under the influence of different support conditions using eigenfunction expansion method along with the orthogonal mode-coupling relation in the case of finite water depth. Further, the analysis is extended for shallow water depth, and the continuity of energy and mass flux is applied along the edges of the plate to obtain the solution for the problem. The hydroelastic behaviour in terms of reflection and transmission coefficients, plate deflection, strain, bending moment and shear force of the floating thick elastic plate with support conditions is analysed and compared for finite and shallow water depth. The study reveals an interesting aspect in the analysis of thick floating elastic plate with support condition due to the presence of the rotary inertia and transverse shear deformation. The present study will be helpful for the design and analysis of the VLFS in the case of finite and shallow water depth.

前縁を柔軟支持された矩形シートのフラッタ（シート支持条件のフラッタ特性への影響）

前縁を柔軟支持された矩形シートのフラッタ（シート支持条件のフラッタ特性への影響）

Influence of support conditions and temperature on the EMI characteristics

The present work reports results from an extensive set of measurements which has been performed in order to formulate standard method to remove temperature changes from impedance measurements. The other issue addressed here is the investigation of influence of boundary condition and temperature changes on electromechanical impedance measurement for structural member. Due to electromechanical coupling, changes in dynamic characteristics can be seen in electrical impedance of piezoelectric transducer. Two different systems have been used during this measurement process. System based on FBG sensors has been used for temperature changes measurement while PZT transducers mounted on the structure with impedance analyser were used for electrical parameters measurement. During research electrical impedance and resistance of piezoelectric transducer were measured in order to analyze changes in amplitude of peaks and the frequency shift of peaks due to temperature variations and different configurations of the beam.

Influence of Support Conditions on Vertical Whole-body Vibration of the Seated Human Body

The vibration transmission to the lumbar and thoracic segments of seated human subjects exposed to whole body vibration of a vehicular nature have been mostly characterised without the back and hand supports, which is not representative of general driving conditions. This non-invasive experimental study investigated the transmission of vertical seat vibration to selected vertebrae and the head along the vertical and fore-aft axes of twelve male human subjects seated on a rigid seat and exposed to random vertical excitation in the 0.5-20 Hz range. The measurements were performed under four different sitting postures involving combinations of back support conditions and hands positions, and three difference magnitudes of vertical vibration (0.25, 0.5 and 1.0 m/s(2) rms acceleration). The results showed significant errors induced by sensor misalignment and skin effects, which required appropriate correction methodologies. The averaged corrected responses revealed that the back support attenuates vibration in the vertical axis to all the body locations while increasing the fore-aft transmissibility at the C7 and T5. The hands position generally has a relatively smaller effect, showing some influences on the C7 and L5 vibration. Sitting without a back support resulted in very low magnitude fore-aft vibration at T5, which was substantially higher with a back support, suggestive of a probable change in the body's vibration mode. The effect of back support was observed to be very small on the horizontal vibration of the lower thoracic and lumbar regions. The results suggest that distinctly different target body-segment biodynamic functions need to be defined for different support conditions in order to represent the unique contribution of the specific support condition. These datasets may then be useful for the development of biodynamic models.

703 減衰特性を用いた亀裂検査における支持条件の影響(変換素子・動特性・安定)

703 減衰特性を用いた亀裂検査における支持条件の影響(変換素子・動特性・安定)

Contribution of Support Means to Stresses Developed in Sheet Metal Coils

Sheet metal is often stored in large wound coils and processed through such manufacturing stages as cleaning, coating, and slitting in a finishing plant or thickness reduction in a rolling mill. During winding and unwinding operations, as well as during storage and transportation, a coil can be supported in a variety of methods. The coil can be formed on a relatively compliant fiber core, or it can be mounted with the core onto a drive shaft or a pair of core chucks. The stresses within the coil develop in response to the sheet metal’s material properties, the process tension, and the type of support condition that is present along the coil’s inner diameter. In this investigation, a two-dimensional finite element model is applied to capture the stress distribution within sheet metal coils. The influence of support condition on the state of stress is investigated for sheet metal on a core alone, and for the cases in which the coil is supported by a drive shaft or core chucks during winding. The radial and width-wise variations of the stress components are calculated and compared in the light of the differences in compliance between the three means of support.

FREE VIBRATION ANALYSIS OF SANDWICH PLATES ON FLEXIBLE SUPPORTS

SUMMARY A triangular sandwich finite element with 54 degrees of freedom have been developed. Using this finite element, numerical experiments on sandwich plates have been performed. The aim is to see the influence of support conditions, geometrical dimensions and material properties on the free vibration frequency. This is done by developing analytical expressions for the free vibration frequency as a function of the variable parameters. Some examples are presented to illustrate the behaviour of the finite element used in the development of these expressions. The result from the numerical experiments are given in tables and analytical expressions for calculation of the free vibration frequency are included as well.

The influence of changing support conditions on the vibration of buckled plates

The influence of support conditions which change during the loading process on the stability and the vibration characteristics of rectangular plates is discussed. A simplified model is used in the analysis of both perfect and initially imperfect plates. The results obtained contribute to a better understanding of the complex dynamic behavior of buckled plates and stress the need for the accurate definition of the support conditions. The work is done in the scope of the elastic stability.

The influence of support conditions in the loading fixture on failure mechanisms in the push‐out test: A finite element study

The usefulness of the push-out test as an indicator of interface strength was evaluated using finite element models of intact and partially failed cylindrical push-out specimens loaded against a rigid annular support. The irregular stress distributions that were found in intact specimens depended more on interface conditions at the loading fixture than on a 35% increase in interface area. The maximum stress at the interface was a tensile stress. Critical energy release rates for interface failure were calculated for flawed specimens in which flaw size was either 10 or 100 microns, and for boundary conditions at the loading fixture that were either fixed or slipping in the radial direction. The critical energy release rates depended heavily on the support boundary conditions. Thus, the results of parametric push-out tests can be reasonably compared only for specimens that are very similar in geometry and that are loaded in very carefully controlled fixtures.

Discussion: The influence of support conditions on the behaviour of square concrete tanks

Discussion: The influence of support conditions on the behaviour of square concrete tanks

The influence of support conditions on the behaviour of square concrete tanks

Summary The paper describes a theoretical and experimental investigation of the structural behaviour of a tank in the shape of a cube under six different support conditions which include point, line and distributed reaction patterns. It is demonstrated that the method of supporting the tank has a significant effect upon the magnitude and distribution of the bending moments, particularly those values used in the design of the sections of the wall panels and floor slabs of tanks. The accuracy of the analytical predictions is checked by deflexion and curvature measurements taken on a Perspex model tank with appropriately simulated support conditions. Generally, there is a good correlation between the theoretical and experimental results.

Influence of Support conditions on the behavior of Long Rectangular Tanks

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