January 1972 Part 3 Examination and Technican Test

Mr. A. S. Grimes (F): I welcome the opportunity to discuss the information on this interesting material. Although weathering steel is being used abroad a great deal, it appears to be catching on only very slowly in the UK. As a medium of architectural expression it does seem to offer exciting possibilities, while on the other hand, in the right circumstances, thereare many applications where its totalitarian qualities can also produce considerable economies. I have seen the building in Brussels, which Mr. Godfrey described, where all the external stanchions are exposed to the atmosphere, the only protection being the weathering properties of the steel. As the steelwork was exposed it was essential to detail it with very great care to produce the clean simple lines which the architect wanted. If we use it here in this way we will have to follow the same sort of disciplines.

I wish to compliment the authors for their very interesting and highly practical paper. Professor Patricio A. Laura

Column curvature curves are used to solve general inelastic beam-column problems in a manner similar to the use of column deflexion curves. Curvature curves are obtained analytically from differential equations while rotation and deflexion are computed by numerical integration of curvature. Three cases of column curvature curves cover all possible cases of elastic-plastic beam-columns. Complete elastic-plastic responses of beam-columns are investigated. Interaction relationships between thrust and end moment for ultimate strength of a beam-column are given. Numerical results are presented for beam-columns with a wide-flange section. W.F. Chen and T. Atsuta