Metal building system builders have an option to use straight columns or tapered columns to hold up the ... there’s no reason to make a conventional parallel beam. The depth at the top is dictated by ...

The Wembley stadium site was evacuated after a 50-tonne steel rafter slipped 1.6ft ... site of the 3,000 plus workers until we have a full report on the incident." The beam, which measures about 50m ...