Analysis of Construction Process for Gymnasium and Natatorium of Hangzhou Olympic Sports Center

The steel roof project of the three Asian games stadiums of Hangzhou Olympic Sports Center was divided into three parts:natatorium roof, central hall roof and gymnasium roof. It was composed of single layer and double layer reticulated shell. Among them natatorium and gymnasium roof was also divided into double-layer reticulated shell, single-layer reticulated shell, junction truss and gate arch structure and so on. And the roof of the central hall was divided into a single-layer reticular shell and two bucket structure. The roof has large span and complex shape that its members were mainly box-type bending and torsion members. The construction plan that was large walking tower crane block lifting and local hydraulic integral lifting was adopted.
This paper first introduced the general idea of steel structure installation that steel structure divided into three areas and five construction areas, lifting area and lifting area for cross construction and finally for sectional unloading.Secondly, the whole process of steel structure installation including installation and unloading was simulated with MIDAS software. The stress and deformation analysis of the control conditions in each construction zone was emphatically analyzed, and compared with the stress and deformation in the designed state. The control points of vertical deformation were selected by selecting the chord of the middle span of the natatorium, gymnasium and central hall as the stress control unit, and 1/2 span and 1/4 span as the control points of vertical deformation. The changing of stress and deformation during construction was analyzed, its result showed that unloading step was key working condition of control. Finally, the paper introduced the analysis of lifting construction of the lifting area, the result showed that a member with high stress was near the lifting point in the large area, and the stress ratio decreased after and unloading, so as to meet the safety requirements of construction. The simulation results of the whole construction process verified the feasibility of the construction method, due to the large structural boundary stiffness of the natatorium, the central hall and the gymnasium, the construction process had little influence on each other that also verified the feasibility of the construction method of partition installation and partition unloading.