The Investigation of Long-span Double-layer Reticulated Dome Greenhouse's Dynamic Characteristics

The wind load always plays a decisive role in the safety of double-layer reticulated dome greenhouses, which not only have a succinct and esthetic appearance but also possess a excellent mechanical performance for applying of a greater span. Fully understanding the dynamic characteristics of this new type of greenhouses is beneficial to the further analysis this structure's dynamic response under wind load. In this paper, calculation models are established under reasonable mechanics assumption. According to the basic theory of structural dynamics, this paper obtains the natural periods of vibration and vibration modes of the structure with the using of subspace iteration method and finite element software ANSYS. The relevant parameters that effect the structure's dynamic property, including rise-to-span ratio, thickness of dome, span, cross-sectional dimension of steel tube, size and distribution of the load, are considered to obtain the change rules. Then the rules acquired by this paper can service wind-resistant design in engineering practice.