Author: Hill, J
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This paper presents a practical method for designing bulb-flat-stiffened plating against local buckling, without limitations on section slenderness. The aim is to improve the current shape limitation requirements of BS 5400: Part 3, which are known to be unduly conservative. This is of particular concern when applied to assessment of existing structures. Behavioural insight and validation is provided by 60 finite element (FE) solutions. A strength curve for the design of plate panels, which is a function of the system-critical stress, expressed as the critical slenderness parameter ep, given in a previous paper, is verified by further numerical data in this paper. A modified Perry equation is proposed for the design strength of imperfect bulb flat stiffeners, taking into account the restraint provided by the plate. The strength of the stiffened plate is given byadding the stiffener strength to the plate strength. S.K.G. Chou, J.C. Chapman and P.C. Davidson
The Forces in Roofs Simon Course, a Graduate Member writing from Salisbury, has explained why calculations for tie forces are often wrongly derived: Consider a simple roof construction, as shown in Fig 1, with all three joints pinned and a rafter UDL. When checking submissions for Building Regulation approval, it seems that many engineers derive the tie force (and hence the load for the rafter/tie connection design) by using the expression T=R/tane. As tane=2H/L, this gives T=RL/2H. This is in fact incorrect.
The new parliamentary building, adjacent to the Palace of Westminster, provides offices and committee rooms for MPs. The location in a World Heritage site was an important factor in the design; equally significant was the presence below of the new Westminster underground station. J.A. Thornton, C.P. Dewy and D.M. Mitchell