Author: Chen, L K;Wong, K C
First published: N/A
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Chen, L K;Wong, K C
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.
In a number of structural engineering applications use is made of high tensile steel cables for load carrying purposes, e.g. suspension bridges, guyed masts, overhead electric lines and cableways. In many of these applications the cable is uniformly loaded and hence hangs in a catenary. When a structure incorporating one of these elements has to be analysed difficulties are encountered due to the non-linear response of a catenary to applied loading. This paper gives graphical and analytical data together with the linearized stiffness matrix for a catenary element which enable
speedy calculations to be made. The application of this to the analysis of an electric line river crossing is given.
T. J. POSKITT