Abstract：Abstract：Research purposes：The dome of newly-built Yujiapu railway station in Beijing-Tianjin intercity line extension is a single layer shell structure, which is weaved by 36 positive and negative spiral grid. The shell with a long span of 143 m is novel and complex. This paper researches the force characteristics and boundary conditions in order to choose the suitable support programs of the shell.
Research conclusions：（1）Bearing is a key component of the connecting shell structure. The lower part of the support structure, support program is directly related to the assumed boundary conditions of the shell.（2）In determining the bearing reaction force, not only consider that the effect of the rotation center and the calculation model of bearing rotation center does not coincide with the additional bending moment, but also consider the rare earthquake force.（3）Double hinged bearing which is made of horizontal spherical steel bearing and vertical spherical steel bearing rotates along the bottom beam ring centroid, and satisfies the boundary condition. We use non-earthquake and rare earthquake condition of bearing reaction force envelope to do double hinged bearing arrangement in detail.（4） We conducted a double hinged bearing finite element analysis and a reduced scale test to verify that the stress and rotation performance meets the design requirements. （5）The research results of innovative double hinged bearing can provide references for similar projects.
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