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The stresses which in theory can occur in a simply supported structure owing to temperature distributions are, as demonstrated by the author, significant in terms of the total load effects. However, since the stresses are caused by the self-restraint of the section, it would seem logical to expect some reduction of stress with the onset of cracking, whether caused by the effects of the temperature distribution itself or by external loading. The method by which allowance for cracking should be included in the temperature stress calculations is not clear, although the technique
adopted would seem to be a logical approach. Indeed, if the stresses obtained (Fig 5(h)) are compared with those calculated assuming an uncracked section, there is a reduction in the top surface compressive stress of about 13% using the cracked section. However, if the stresses calculated at a depth of 360 mm using the two methods are compared, it can be shown that using an uncracked section results in a tensile stress of 0.6 N/mm2 compared to 1.1 N/mm2 for the cracked section. It would
seem that there is a need for further research in this area.
Local authority responsibility
A structural engineer employed by a local authority once again raises the issue of where the responsibility should lie if structural defects arise in a building. He writes: I am concerned athe almost standard procedure which now seems to be accepted in
respect of the submission of structural designs and calculations for Building Regulations approvals. It seems to me most unfortunate, and certainly not in the best interests of the profession or of the general public, that the present assumption of responsibility on the part of district local authorities for any structural building
defect should continue.
Mr. T. A. G. Raikes (M) (Ove Arup Resident Engineer): We thought it would be useful to start the discussion by saying something of how the diaphragm wall construction worked out in practice, particularly in relation to the use of T-shaped and Ushaped panels.