Prestressing techniques and arrangements

摘要: A prestressing arrangement and technique for the manufacture of prestressed bodies or structures includes shape memory material members. According to one aspect invention, a tensile member in series with member. The formable is shaped around members fixed form. then shrunk by heating it above its characteristic threshold temperature, placing tension compression. another aspect, secured tube. Prestressing achieved tubular lengthwise expansion prior fixing body being formed, after fixation, releasing stress on member, leaving tube exert compressive forces material.