Structure Design on Long-Span Space Free-Form Surface Shell of Atrium Roof of Changsha Live

The free-form curved roof of Changsha Live atrium is supported across the four structural monomers in the lower part, the middle part is an openable roof, and the secondary membrane structure is rooted on the main structure. The atrium roof adopts a long-span single-layer reticulated shell structure. The structural selection and the reasonable setting method of fixed hinge supports and sliding hinge supports were introduced. The wind load of the roof should be taken according to the local natural conditions and the wind tunnel test report. The finite element software MIDAS/Gen was used to analyze the static and overall stability of the reticulated shell structure, and the reticulated shell and the lower concrete structure were assembled to analyze the influence of the lower structure on the stress of the reticulated shell structure by comparing the natural vibration period, displacement and support reaction. The design bearing capacity and stiffness of the joint were analyzed by finite element model, all calculation results of reticulated could meet the requirements. In addition, deformation monitoring was carried out during construction, and the monitoring values were within the design calculation range.