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Mr J. E. A. Tapsell (M), (Tapsell Wade & Partners)
This is a very tantalising building, still 'shrouded in mystery'. The paper refers, in very general terms, to the steel structure, and I hope that the authors will be able to give more details about the actual steel frame. I am interested in the combined steel and concrete floor, the connections used between the floor beams and the steel columns, the stability bracing in the lift and stair towers, and a more detailed plan (if possible) of the stair and lift areas. I should like to know how the steel stanchions and bracing were clad.
The actual flexibility of nominally ‘rigid’ connections and the actual stiffness of nominally ‘pinned’ bases can have a major effect on the accuracy of prediction of structural deflections under service load conditions. Connection flexibility tends to
increase deflections, but base stiffness usually will reduce deflections. Both can be important factors in the acceptability of calculated predictions, particularly for large-span, lowrise portal frame structures for which end wall and roof sheeting and
bracing stiffness play a minor role in providing lateral stiffness.
Professor R.E. Melchers and G. Maas, BE
The influence of compressive axial load on the shear capacity of reinforced concrete elements is investigated, using results from tests on 15 external reinforced concrete beam-column connection specimens. Shear stresses in the connection zones of these specimens are compared with values predicted by the design equations in BS 8110 and observations made concerning the applicability of these equations. The revised eqns. (6a) and (6b) in BS 8110 are presented and recommendations made for assessing shear stresses at initial joint cracking and specimen failure. Bearing stresses within bends in the reinforcement in the connection zones are also evaluated and compared with the
recommendations of BS 811O.