FE model updating of grid structure considering deformation of crooked members

Abstract

This study proposes a method for updating the finite element model of crooked members in grid structures based on 3D scanning data. The crooked member is modeled using the multi-beam methodology, and two function curves are established to simulate different types of member deformation. Two parameters, section stiffness correction factor and initial stress, are introduced to account for changes in section and stress state. An experiment is carried out on a grid structure with crooked members, and the deformation of the member is obtained using 3D laser scanning technology. The bending deformation of the member is modified in the case of mild structural damage, whereas in the case of severe structural damage, the properties of the new crooked members are modified, along with the pre-set crooked member. The resulting modifications agree well with the measured results. The load-displacement curve calculated using the finite element method matches the actual loading process. Therefore, the results of this study can be utilized in the safety evaluation of grid structures with crooked members.