The Selection of the Long-span Spatial Structural Projects Based on the Unascertained Measure

Aiming at the characteristic of distortion in the evaluated result because of much unascertanty information and the difficulty to synthesize the unascertanty and fix quantify to evaluate the scheme in the selection of the long-span structure, the unascertained measure model and the incredible degree are discussed and a model of selection of the long-span structural projects based on the unascertained measure is proposed in this paper. The model has more advantage than fuzzy math when disposing unascertained factors, e.g. less data lost and more credible. Finally, an engineering example is discussed by using the proposed model.