群组成帧或后框架结构是已在30年代期间开发了一种简单,成本有效的耐用的设计。最初一轮的电线杆构成,今天的极建筑物使用的层叠柱或方形的帖子。磁极或柱被接合以创建建筑物帧壁板附接至和椽子在休息并固定到。Pole construction has commonly been used to build garages, agricultural and equestrian structures, and airplane hangers, but can also be used in the construction of low rise commercial or residential structures.