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Though the steel portal frame is one of the simplest structural arrangements for covering a given area, the designer probably has to satisfy at least as many different structural criteria as for more complex structures. Present-day design of portal frames is reviewed in the light of recent research studies into certain aspects of the behaviour of portal frames, particularly the problem of stability of haunched rafters. Guidance is given for checking the lateral stability of such members. L.J. Morris
The role of Codes as an aid in achieving good construction is much in dispute. Should they be somewhere between recent research and standardised proven requirements, telling engineers what is good practice, or should they be precise documents that set out how the task should be handled? Assuming that such precision is even possible, is it in fact desirable, or will innovation and flair be stifled? Are they a guide to the knowledgeable or a safety net for the amateur? If precise in their demands, should such Codes be the means of meeting statutory requirements? J.G. Sunley and R.G. Taylor
When a house or some other form of property changes hands, the buyer usually commissions a survey of it; or, if a mortgage is negotiated, the Building Society will give instructions for a surveyor to establish value. Whoever undertakes a survey is legally responsible for what is said in the report to the client.