STABILITY AND RELIABILITY ANALYSIS OF TENSION-STRING BIDIRECTIONAL LATTICE MONOLAYER CYLINDRICAL RETICULATED SHELLS

Strings and cables are arranged outside the surface of bidirectional single-layer cylindrical reticulated shells to form a tensive-string structural system, which effectively enhances the strength of the structure. In this paper, the influences of the prestress, span ratio, initial defect and cable strength on the static stability of reticulated shells with spans of 40 m, 50 m and 60 m are analyzed. The practicability of the structural system is demonstrated by examples of reticulated shells with spans of 100 m and 120 m. Based on the response surface method of ANSYS and MATLAB, the reliability of reticulated shells under the failure modes of strength failure and deformation failure was analyzed. The failure probability, reliability index, sensitivity and correlation were obtained. The results show that the maximum stability strength of the structure was increased by 744% after arranging the chords and cables. The failure probability of the stability strength of the 100-m-span reticulated shell is 1.026 54×10⁻¹, and its reliability is relatively low. The stability strength and failure probability of deformation of reticulated shells with spans less than 60 m are very small. The strength of the cable in the reticulated shell is the main factor affecting the stability of the structure. In large-span reticulated shells, the influence of cables is relatively weak. The tensile strength and the inner and outer diameters of chords have a certain influence on the structural deformation.