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Dr. Gunaratnam has undertaken a useful service for designers in comparing curvature and deflection calculated according to CP 110 Appendix A with the values obtained by simpler methods. However, his statement that the latter ‘lead to an underestimation of the curvature in all cases’ is startling for, if I have understood him correctly, he is saying that, by taking account of the stiffening effect of the concrete in tension, the calculated curvature is actually increased !
1. The Panel is extremely conscious of the ongoing nature of the work necessary to put
limit-state design using partial safety factors on a consistent and logical basis and of the amount of research that will be required to provide a sound basis for this. This second report is directed at offering some general recommendations to Code drafting committees when dealing with partial safety factors, suggest in guidelines for the experimental calibration of these on the lines of the suggestions made in paragraphs 4, 5, 6 and 7 of the first report*, and indicating subjects where further study and research is desirable.
This paper outlines some of the basic steps taken and factors to be considered in the design of lattice steel towers. The TOWER computer system is described. This is an interactive computer system comprising three programs developed especially for the structural analysis, design, and automatic drawing of self-supporting lattice steel towers. Details are given of the scope of the computer system and of its method of operation as an interactive design aid. The designer can take advantage of a wide range of available program options to define the structural system, the environmental loadings, and the strength and serviceability design criteria. The benefits of the computer system include considerable savings in overall design time and improvements in the accuracy of applied loadings and member forces for design.
Michael Shears and Graham A.N. Thomas