ARMY BEAM WITH PRE-STRESSING ELEMENT INSIDE THE SAME

摘要

P An armed beam 2 to be positioned between a pair of posts 1, the armed beam 2 comprising a pair of upper chord sections 7 arranged generally parallel to each other in a horizontal plane; / P P a section lower chord member 8 disposed below the upper chord portions 7 to form a triangular cross section so that three vertices are formed by the upper chord members 7 and the lower chord section 8; / P P a prestressing member extending generally longitudinally within the triangular space; whereby a compressive force is exerted on the lower chord section when a stress is exerted on the the prestressing element. / P