第2章+薄壳结构详解.ppt

* * * * * * * * * Thin-shell structure 2. Mechanical properties 鞍壳、扭壳的受力特点 The load-carrying theory of saddle shell and torsional shell is reasonable and it is calculated by reference to the nonmomental theory. 鞍壳、扭壳受力合理，一般均按无弯矩理论计算。 principal tensile stress principal compressive stress 2.3.5 Folded plate structure 折板结构 Thin-shell structure 1. Composition and forms 折板结构的组成及结构形式 Long and narrow plates Span 30m Diaphragm. Spandrel beam load-bearing lateral bracing biaxial stress guarantee Elongated roof Thin-shell structure 1. Composition and forms 折板结构的组成及结构形式 Overhanging cantilever 外伸悬挑 Main forms Thin-shell structure 1. Composition and forms 折板结构的组成及结构形式 Deformed Folded plate 变形折板 Main forms Thin-shell structure 1. Composition and forms 折板结构的组成及结构形式 Parallel combination 并列组合 Main forms Thin-shell structure 1. Composition and forms 折板结构的组成及结构形式 Reverse parallel combination 反向并列组合 Main forms Thin-shell structure 1. Composition forms 折板结构的组成及结构形式 · Advantages 1、Better loading features than beam plate structure; 受力优于梁式平板结构； 2、Simple construction and unique shape ； 制作简单，造型独特 3、Large stiffness Good integrity; 刚度大、整体性好， 4、Favorable seismic performance； 有良好的抗震性能； · Disadvantages 1、Thin plate Bad?thermal insulation effect; 折板很薄，结构本身的隔热效果差。 Thin-shell structure 2. Mechanical properties 折板结构的受力特点 Bidirectional loading bidirectional force transmission; 双向受力，双向传力 The function of the crease is to ensure the enough longitudinal stiffness of the structure. 折缝的作用：保证结构的纵向刚度； The role of the diaphragm is to fix the inclined plate to perform its strength. 隔板的作用是固定斜板，以发挥斜板的强 度。 Thin-shell structure 2. Mechanical properties 折板结构的受力特点 Longitudinal folded plate can be calculated by reference to the theory of simply supported beam. 纵向折板可按照简支梁 的理论进行计算 Thin-shell structure 2. Mechanical properties 折板结构的受力特点 Calculate with 1m wide plate and by reference to the theor