[提要]  叉筒网壳是由柱面网壳交贯而成的新型网壳结构，根据相贯线的特点可分为谷线式和脊线式两种基本形式；膜型网壳是参照膜型扁壳的成型方式设计的。脊线式叉筒网壳在造型上最明显的特点是光滑的圆柱面交贯形成脊线，曲面在脊线处发生突变；而膜型网壳曲面则是完全光滑的。为了探讨脊线的造型特征对结构性能的影响，将覆盖平面同为正方形的单层脊线式叉筒网壳与膜型网壳进行了对比分析。
[关键词]  叉筒网壳  膜型网壳  曲面造型  受力特征  对比分析

Latticed intersected cylindrical shell( LICS) is a new type of latticed shell formed by intersecting of two or more cylindrical shells.Latticed membrane shell( LMS) is formed as membrane shell according to Specification  for Design of Reinforced Concrete Shell Structures ( JGJ/T22-98). It is the most outstanding shape characteristic of ridge style LICS that cylinders intersect with ridge line and the surface is broken on ridge line. Contrarily, surface of LMS is thoroughly smooth. In order to reveal the shape influence to structural behavior, the comparing study between single-layer ridge style LICS and LMS which covered the same square plan is carried out.
Keywords:  latticed intersected cylindrical shell( LICS); latticed membrane shell( LMS); curved surface shape; structural behavior; comparing study