The paper presents a straightforward yet versatile approach to the analysis of elastic beam buckling. The proposed method is essentially an adaptation and extension of that proposed by Newmark for the buckling of axially-loaded columns. This makes for ease of programming and facilitates the analysis of refined numerical models. The analytical procedure is demonstrated by means of model calculations, and its validity is attested by comparisons with the results of previously published buckling analyses.
The California bearing ratio (CBR) test for road pavement materials has remained popular for over 50 years. It is a lengthy and relatively expensive test and attempts have been made over the years to substitute it with mathematical or graphical models that utilize soil classification parameters such as grading and Atterberg limits to predict the CBR. This paper details an investigation in which archival data were used to evaluate the existing models for some selected Natal soils, and descriptionbes how the relationships between CBR and various classification parameters (in both simple and multivariate forms) were further examined when these models were found to be generally unsatisfactory. The lack of any correlations suitable for use in a universally applicable prediction model is discussed, the good relationship between CBR and maximum swell is examined, further research into the influence of the clay fraction on CBR prediction is reported and the interim use of the shrinkage and grading moduli to obtain minimum CBR values for shrinking and non-shrinking soils respectively is proposed.
The paper, 'Alternative ultimate limit state design of steel sway frames - parametric study', was a sequel to recent publications in which a novel method to allow for the P-delta method was examined by way of a wider parametric study covering various sub assemblages and also a full framework. The method does not require the calculation of the effective column lengths and in principle would remain valid where fully plastic analysis is adopted by design codes. It was concluded that this extremely simple method could lead to savings in materials as well as in design time compared with conventional effective length-based procedures.