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Design methods for beam members with braided composites
The conventional scaffolds used in construction works are usually constructed by various steel components. Both weight reduction and rigidity maintenance is a very important issue. Therefore, scaffolds were fabricated by using FRP. Braiding is one of the textile techniques to fabricate the preform with complex shapes and braided preforms can be fabricated without cutting the fibres at connecting parts. Scaffolds composed of light and rigid three-dimensional braided composites were produced. In the study, the proposed scaffold was a beam structure composed of straight tubes and T-shaped tubes. Self-vibration analyses were performed in order to examine the stability of the proposed structures. According to the self-vibration analytical results, the optimised beam structure was proposed. On the other hand a database for basic mechanical properties of various braided composites included tubular and T-shaped braided composites have been established. The whole beam structure is a tube, all dimensions is 450 mm and the maximum weight on the top is 980 N. The straight braided tube had 3 layers. The outer diameter was 21.5 mm and the nominal thickness was 2.0 mm. The stability of different straight braided and T-shaped composites were compared by using self-vibration analysis. The compressive strength of tube, tube with bolt joint and T-shaped tube were derived from the database. Normal and shear stresses caused in the beam components were independently calculated. The results indicated that the dominant stress component caused in all beam components was normal stress. The stress which occurs in the floor vertical beam was important when strength was considered. The shear stress which occurred in all beam components could be neglected. This indicates that load applied in the vertical beams could not be transmitted to parallel beam components with the floor. The safety factor for braided tube with bolt joint and T-shaped braided tube was calculated. The results demonstrated that the demand for the design of the structure was satisfied.
Design methods for beam members with braided composites
The conventional scaffolds used in construction works are usually constructed by various steel components. Both weight reduction and rigidity maintenance is a very important issue. Therefore, scaffolds were fabricated by using FRP. Braiding is one of the textile techniques to fabricate the preform with complex shapes and braided preforms can be fabricated without cutting the fibres at connecting parts. Scaffolds composed of light and rigid three-dimensional braided composites were produced. In the study, the proposed scaffold was a beam structure composed of straight tubes and T-shaped tubes. Self-vibration analyses were performed in order to examine the stability of the proposed structures. According to the self-vibration analytical results, the optimised beam structure was proposed. On the other hand a database for basic mechanical properties of various braided composites included tubular and T-shaped braided composites have been established. The whole beam structure is a tube, all dimensions is 450 mm and the maximum weight on the top is 980 N. The straight braided tube had 3 layers. The outer diameter was 21.5 mm and the nominal thickness was 2.0 mm. The stability of different straight braided and T-shaped composites were compared by using self-vibration analysis. The compressive strength of tube, tube with bolt joint and T-shaped tube were derived from the database. Normal and shear stresses caused in the beam components were independently calculated. The results indicated that the dominant stress component caused in all beam components was normal stress. The stress which occurs in the floor vertical beam was important when strength was considered. The shear stress which occurred in all beam components could be neglected. This indicates that load applied in the vertical beams could not be transmitted to parallel beam components with the floor. The safety factor for braided tube with bolt joint and T-shaped braided tube was calculated. The results demonstrated that the demand for the design of the structure was satisfied.
Design methods for beam members with braided composites
Konstruktionsmethoden für Gerüststangen aus geflochtenen Composites
Azumi, Y. (author) / Tange, A. (author) / Nishiwaki, T. (author) / Hamada, H. (author)
1998
4 Seiten, 7 Bilder, 1 Tabelle
Conference paper
English
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