组合肋壳结构静力特性分析

Study on static characteristics of composite ribbed shells

组合肋壳是一种新型的空间结构形式,采用组合结构有限单元法对组合肋壳结构的静力特性及其影响因素进行了系统分析,并与带肋钢筋混凝土薄壳以及光滑混凝土壳体进行了比较。分析结果表明,随着矢跨比和截面尺寸的增大,边界条件接近刚性,组合肋壳的极限承载力增大;与其它两类壳体相比,由于组合肋中钢肋的存在,使得组合肋壳整体刚度增大,承载能力提高,结构的薄膜压力分布更为合理。

The composite fibbed shell structure is a new type of spatial structure. The static characteristics and the influence parameters for composite ribbed shells are analyzed with FEM, and then are compared with ribbed reinforced concrete shells and concrete shells. With span ratio and composite rib section dimension increasing, boundary condition becoming stronger, the ultimate bearing capacity is increased greatly ; the whole stiffness matrix and ultimate bearing of composite shell both are higher than the other two shell structures. The membrane forces in composite fibbed shells are more reasonable than those of ribbed reinforced concrete shells because the steel ribs exist.