Author: Poskitt, T J
First published: N/A
Standard: £9 + VAT
An IStructE account gives you access to a world of knowledge. Create a profile to receive details of our unique range of resources, events and training.
Added to basket
Poskitt, T J
The following notes describe the repair carried out to the soffit and sides of precast prestressed beams damaged by fire. The method used involved full live loading of the construction to simulate the conditions of the original design as it concerned the state of stress in the concrete. The full loading condition also provided a satisfactory test of the composite construction and the combination of prestressed concrete and in-situ reinforced concrete acting together as a continuous structure.
The conception of a bridge wing wall of minimum length and of minimum area was given to the author by Mr. H. R. Ward, BSc, AMICE, AMIMunE, Chief Assistant Engineer to the Salop County Council. This gentleman made a tour of parts of West Germany in 1957 for the purpose of studying post-war bridge and road design and noted the practice of German engineers of using triangular wing walls lying in the plane of the bridge parapets. The wing walls which are the subject of this paper are shorter in length and less in area than those just mentioned.
The aim of this paper is to introduce a simplified method for the structural analysis of rigid plane and space frames, based on principles which are well known to structural engineers and which do not involve serious mathematics. The derivation of formulae is based on the concept that when a member, continuous over several rigid joints or supports, is cut at any of its joints, the equilibrium of the two portions of the structure is unaltered if the slopes at the section cut are preserved. Thus, either its left-hand or its righthand portion can be replaced by any such torsional or flexural member that fulfils this requirement. This substitute member is said to have the equivalent stiffness of the portion of the structure which it replaces as it exerts the same effect on the remaining portion of the structure as the part removed. This concept leads to the development of a method of transforming a complicated plane or space frame having mutually perpendicular members into a much simpler type of plane structure for analysis.
L.K. Chen and K.C. Wong