Equivalent model simplification method for failure state study of large-span space grid arch structure

Abstract

For any new structural system, the static load-bearing performance, including the failure state, failure mode, and ultimate bearing capacity, is one of the important research contents to ensure the safe operation of the structure itself. However, existing model test methods may not be well-suited to new structures, especially spatial structural systems with complex morphology. Consequently, this paper proposes an equivalent model simplification method for the study of the static failure of a new type spatial grid arch structure. Based on the failure state of the numerical model of the prototype structure, parameters such as the scale ratio, loading mode, and joint stiffness are simplified step-by-step. The prototype structure is simplified and made equivalent to a theoretical scaled finite element model according to the scale ratio and loading. Then, a scaled test model and an actual scaled finite element model are established through the correction of actual parameters such as materials, dimensions, and node stiffness, and are compared with and verified against the failure state of the prototype structure. Through the equivalent simplification of multiple models, the failure state, failure mode, and ultimate bearing capacity of the spatial grid arch structure are successfully determined. The proposed equivalent model simplification method can provide a new paradigm and an effective approach for the design of test models of new and complex structures.