两种新型大跨度预应力双层平板网架的技术特点与经济指标

Technical characteristics and economical index of two new types of large-span prestressed double-layer grid structures

针对两种新型预应力双层平板型网架,即"大跨度(l 60m)平行跨度折线体内布索预应力双层网架结构"和"大跨度(60 l 160m)屋面斜拉式预应力双层网架结构",本文除讨论其技术特点外,还针对原有"对角线廊外折线布索预应力双层平板网架结构"(原苏联1977年提出)进行对比分析,并通过对相同跨度(100m×100m)、相同荷载(轻屋面、相同地点)的"三层平板网架结构"与"屋面斜拉式双层预应力平板型双层网架结构"对比分析,讨论其技术经济指标.

The technical characteristics of two types of double-layer prestressed grid structures including the large-span（l≤60m） prestressed double-layer grid structure with folded cables and the new large-span （60≤ l ≤ 160m） prestressed double-layer grid structure are discussed in the paper. The compariston between them and the external prestressed grid structure with diagonal cables （proposed by Russian in 1977） is then made. The technic-economical index is also compared through the analysis of the three-layer plate grid structure and the new prestressed double-layer grid structure with the same span（100mX 100m） and subjected to the same load（light-weight roof, same place）.