Research Progress on Simulation Methods of Initial Geometric Imperfection Fields of Single-Layer Gridshells
The safety of single-layer gridshells depends largely on their buckling capacity,on which the initial geometric imperfections of joint deviations generated during the installation of the structure have a significant impact.This paper reviews the existing simulation methods on the initial geometric imperfection field of single-layer gridshells and specifications in current codes.The results show that existing stochastic,deterministic,and semi-stochastic simulation methods are all with deficiencies,and it is impossible to determine the real probability model of the buckling capacity of single-layer gridshells;besides,the initial imperfection simulated by current codes is unrealistic.Therefore,it is urgent to propose a simulation method for the initial geometric imperfection field that considers the structural topological constraints,with reasonable basic assumptions and controllable computational costs,providing a scientific basis for the improvement of the global stability analysis method for single-layer gridshells and a theoretical foundation for the analysis of their stability reliability.
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