Displacement-based dynamic stability determination and assessment of single-layer reticulated dome structures under seismic actions

The dynamic stability of spatial steel reticulated dome structure under seismic wave is an important component that affects structural safety, and should receive focused attention. In order to address the problems, the lack of a quantitative evaluation index and a qualitative assessment method for the dynamic stability of the structure, the stability is studied from the perspective of displacement. A new displacement-based dynamic stability criterion, based on the average value of all nodal vertical displacements at each moment and that of all node average vertical displacements during the time history, is proposed to serve the establishment of the quantitative evaluation index for the dynamic stability. Then, the evaluation indexes for the dynamic stability and instability performance are proposed by the representative displacements during dynamic stability and instability process, respectively. Further, the dynamic stabilities of a large number of structural models are analyzed to classify the dynamic stability as four levels by the values of evaluation indexes. For the convenience of engineering application, an assessment method, determining the level of the dynamic stability to a new model, is innovatively proposed by using the deep learning algorithmic model, for the first time. The systematic analysis of dynamic stability criterion, and stability evaluation and assessment, which can provide a good reference and guidance for engineering practice, has been carried out by K6 and K8 single-layer reticulated dome structures with different parameters.