考虑不完整边界条件的新型混合试验方法

Abstract: Hybrid simulation is a powerful and cost-effective technique to evaluate structural dynamic performance. However, when the boundary of a physical substructure has many DOFs, its boundary condition is difficult to be fully realized, while absence of boundary conditions is bound to change the stress state of the original structure and eventually affects the correctness of structure evaluation. Here, an online numerical simulation method based on model updating was proposed, it was called a novel hybrid simulation method considering incomplete boundary conditions. With the proposed method, two sets of numerical models with the same constitutive relation were built to be applied in the finite element (FE) analysis of the whole structure and the constitutive model parametric recognition of a physical substructure, respectively. The boundary conditions were naturally satisfied because a structure's response was obtained with the whole structure's numerical model, and the numerical model's constitutive parameters were constantly modified online based on the test results of physical specimens to improve the correctness of numerical calculation. Virtual hybrid simulations of a RC frame structure under incomplete boundary conditions were conducted. The results showed that the effect of incomplete boundary conditions is almost eliminated and the accuracy of the proposed hybrid simulation is improved.