Flexural rigidity

About: Flexural rigidity is a research topic. Over the lifetime, 3829 publications have been published within this topic receiving 56780 citations.

Experimental Analysis of Bending Resistance of Bamboo Composite I-Shaped Beam

Abstract: A new type of bamboo composite I-shaped beam, which consists of bamboo laminate as its upper and down flange plates and bamboo curtain plywood as its web, was introduced in the paper. In this new type of beam, a connection between the flange plates and the web was enabled with a combined action of epoxy resin adhesive and a bolting joint. A model test on the bending mechanical properties (e.g., bending failure mode and bending capacity) and the factors influencing the flexural rigidity of the bamboo composite I-shaped beam was conducted. The preliminary results showed that the bamboo composite I-shaped beam has excellent mechanical properties that could offer high bending capacity and bending rigidity, as well as excellent ductility of the structure. Therefore, the bamboo composite I-shaped beam is potentially interesting for application in small- to medium-span bridges as a new type of structure. Moreover, this experimental research could help with a design method for bamboo composite I-shaped beams in the future.

Head supporting device

Abstract: PURPOSE:To heighten the rigidity of a loading beam and to suppress the vibration of the loading beam due to windage disturbance according to the rotation of a recording medium, by providing at least one auxiliary flange element along a direction almost crossing orthogonally to the longitudinal direction of the loading beam at the flat part of the loading beam. CONSTITUTION:A head supporting device is constituted of the loading beam 2 which puts load on a magnetic head 3, a gimbal elastic spring element 1 whose one end is coupled with the loading beam 2 and supports the magnetic head 3, and a load flat spring part 9 which applies pressing load on the magnetic head 3. The loading beam 2 is provided with an elongated flat part 5 and flanges 4 at both sides of the part, and at the root part of the flat part 5, an auxiliary flange 6 is provided in a direction crossing with the longitudinal direction by cutting and bending the flat part 5. Therefore, the twisting and flexural rigidity of the loading beam 2 can be heightened, and the amplitude vibration of the loading beam 2 due to air flow according to the rotation of a recording disk can be suppressed at a low level, which stabilizes the floating of the magnetic head 3.

Effect of Axial Load on the Flexural Properties of an Elastomeric Total Disc Replacement

Abstract: Study Design. Twelve Cadisc-L devices were subjected to flexion (0°–6°) and extension (0° to -3°) motions at compressive loads between 500 N and 2000 N at a flexural rate between 0.25°/s and 3.0°/s. Objective. To quantify the change in flexural properties of the Cadisc-L (elastomeric device), when subjected to increasing magnitudes of axial load and at different flexural rates. Summary of Background Data. The design of motion preservation devices, used to replace degenerated intervertebral discs, is commonly based on a low-friction, ball-and-socket-articulating joint. Recently, elastomeric implants have been developed that attempt to provide mechanical and motion properties that resemble those of the natural disc more closely. Methods. Twelve Cadisc-L devices (MC-10 mm-9° and MC-10 mm-12° size) were supplied by Ranier Technology Ltd (Cambridge, United Kingdom). The devices were hydrated and tested using a Bose spinal disc-testing machine (Bose Corporation, ElectroForce Systems Group, Eden Prairie, MN) in Ringer's solution at 37°C. A static load of 500 N was applied to a device and it was then subjected to motions of 0° to 6° to 0° (flexion) and 0° to -3° to 0° (extension) at a flexural rate of 0.25°/s, 0.5°/s, 1.0°/s, 1.5°/s, 2.0°/s, and 3.0°/s. Tests were repeated at 1000 N, 1500 N, and 2000 N. Results. Regression analyses showed a significant (\(R^2\) > 0.99, \(\rho\) 0.994, \(\rho\)< 0.05) linear decrease in flexural stiffness in flexion and extension as flexural rate increased. Conclusion. The bending moment of the Cadisc-L increased linearly with flexion and extension angles at 1000 N and higher loads. Flexural stiffness increased with compressive load but decreased with flexural rate.

Flexural Stiffness of Reinforced Concrete Columns and Beams: Experimental Verification

Abstract: The current ACI code 318-02 provisions on effective stiffnesses of beams and columns have been reviewed in a companion paper, in which simple formulas are proposed to determine the effective stiffnesses of reinforced concrete columns and beams, based on an analytical parametric study. Analytical axial load-bending moment diagrams of slender columns for a given initial eccentricity (M/P ratio), obtained using the proposed stiffness assumptions, are compared in this paper with numerous published test data and are found to be in good agreement. The proposed stiffness expressions are applicable for all levels of applied loading, including both service and ultimate loads. Analytical and experimental results show that the flexural stiffness assumption in the current ACI code procedure for design of slender columns using the moment magnifier method (Eq. 10-12 and 10-18) is extremely conservative.