Determination Of Ultimate Strength Research Articles

Determination of Ultimate Torque and Twist of High Strength RC Beams with Ferrocement “U” Wraps: Different Approaches

Designers are more interested in strength at cracking rather than ultimate strength. Still then beyond cracking, the structures are able to sustain more loads. So, determination of ultimate strength is an important parameter in design field. Evaluation of ultimate torsional capacity of high strength distressed beams with ferrocement “U” wrap has been presented here. The evaluation procedure involves experimental results, results obtained by analytical method. As the above two methods are not providing quick solution, rather than the first one is based on destruction of prototype structure for evaluation of strength. Other methods such as soft computing methods have been employed. Two methods MARS and WASPAS are employed here to compute the torsional strength of “U” wrapped beams. These two methods provide quick solutions to estimate the torque and twist at ultimate stage. Predicted values by these methods are within acceptable limits. At ultimate stage , the “U” wrapped beams are able to resist torque more than 41.37% than the unwrapped beams and a completely over reinforced beam resists 98.01% more than plain “U” wrapped beams. Under reinforced “U” wrap beams have undergone 23.9 times more twist than that of plain “U” wrap beams. This proves effectiveness of “U” wrap on periphery of distressed beams.

An Inelastic Theoretical Model regarding the Load-Carrying Capacity of PSL Bending Component

Parallel strand lumber (PSL) is an attractive structural wood composite which may have prospective use in building constructions. Conducting nonlinear analysis for the bending of PSL beams is a critical step in the determination of ultimate strength and deflection of them, which is an essential requirement of the building design philosophy based on probability of ultimate state. For the purposes of this article, an inelastic theoretical model regarding the load-carrying capacity of the PSL bending component has been developed. Based on the uniaxial loading tests, the stress-strain behaviors of PSL composite in the grain direction were measured. 4-point bending experiments were also performed in this study to investigate the failure mechanism of the PSL components. The results show that the tensile stress-strain relationship of PSL materials in the grain direction remains linear until breaking, while the compressive stress-strain relationship exhibits nonlinear characteristics once the compressive stress exceeds the proportional limit, which can be expressed by a quadratic polynomial. The failure mode of the PSL beam can be summarized that the fibres in the top of the broken section were buckling and those in the bottom of the section were broken when failure occurred. Significant nonlinear behavior was exhibited based on the load-deflection curves of the PSL beams. To predict the nonlinear bending performance of the PSL beams, a theoretical model that could consider the nonlinear stress-strain relations of PSL and predict the damage modes of the PSL beams was developed. Well agreements can be observed between the results of calculations and experiments.

Determination of Ultimate Strength of Individual Filaments of Basalt and Taparan Aramid Fibers

The results of processing of experimental data on strength of individual filaments of basalt and Taparan aramid fibers using new pentaparametric distribution are presented. Distribution enables determination of minimally and maximally possible (experimental) values for an experimental data array. Previously, this distribution was tested for steel strength determination results published by W. Weibull. The obtained results can be used for determination of fiber use potential for fabrication of composites. Initial experimental data on the strength of filaments and the results of their treatment are furnished.

Determination of ultimate strength in bending for glass tubes by a radial compression method

Determination of ultimate strength in bending for glass tubes by a radial compression method

Determination of ultimate strength of unidirectional fiber glass

Determination of ultimate strength of unidirectional fiber glass