Robustness study of fabricated single-layer grid shell structures based on component sensitivity and vulnerability

Abstract

Using discrete beam elements (DBE) to simulate the mechanical properties of assemble joints, the refined analysis model of fabricated single-layer grid shell structures for progressive collapse simulation was established. Based on the component sensitivity and vulnerability, the evaluation indexes of component importance and structural robustness were proposed. The effects of meshing sizes, rise-span ratios and connection behaviors on the collapse performance of K6 type spherical surface grid shell were also investigated. The following conclusions are mainly obtained: (1) By conducting the integral scaled model test, the accuracy of the refined analysis model was verified. (2) Considering the sensitivity and vulnerability of components, the evaluation indexes of component importance and structural robustness were proposed, and the reliability of the component importance coefficient was examined. (3) The effects of grid sizes, rise-span ratios and connection behaviors on the collapse performance of the gird shell were studied, and the rules of structural collapse loads changing with grid sizes and rise-span ratios were explained. (4) To ensure the structure with good collapse resistant capacity, the rise-span ratio should not be less than 1/4 for the K6 type spherical surface grid shell, and failure of the connection region should be avoided.