Abstract
A transmission tower and foundations are usually designed separately. A transmission tower is designed as truss structure and four of lowest points of tower members are fixed without considering displacement of foundations. This is reason why allowable displacement of foundations is strictly limited. The authors have developed a new design code called the united design method of a transmission tower and foundations, with studying interactions between displacement of foundations and stress concentration of transmission tower's members. They analyzed many cases of load directions, topographic and geological features, and foundation types, using three-dimensional frame analysis. And then they found that allowable displacement of large transmission towers can be much larger with consideration of stress concentration of transmission tower's members and this is cheaper way for total construction cost.
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