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<p>[quote user="tree68"]</p> <p> </p> <div class="quote-header"> </div> <blockquote class="quote"> <div class="quote-user">VOLKER LANDWEHR</div> <div class="quote-content">As someone said before many of the old bridges were overdesigned, if for rusting or looking forward to future higher loads or just so I can't say. But the effect is the same.</div> </blockquote> <div class="quote-footer"> </div> <p> </p> <p><span style="color:#003300;font-family:'comic sans ms', sans-serif;">I've always thought of the overengineered thing as a result of the lack of sophistication of their design computations.  Rather than design specifically to use, as occurs today using computer modelling, they threw in a significant margin of safety.</span></p> <div style="clear:both;"> </div> <p>[/quote]</p> <p>The structural analysis of trusses is not sophisticated. The Cremona diagram or the method of sections are known since the 1860s and are exact for statically determined trusses.</p> <p>That doesn't say that you are not right. I think we don't know the reasons. Therefore I added "or just so".<br />Regards, Volker </p>
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