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| Design and Calculation Analysis of Joint of Beam － column Constructed with Top － down Method |
| GAO Xi － liang1，LUO Zhi － yong1，LAI Yun － jin2，GAO Yan － bin2 |
| 1． China Railway Eryuan Engineering Group Co． Ltd． ，Chengdu，Sichuan 610031，China; 2． Tongji University，Shanghai 200092，China |
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Abstract Research purposes: The calculation analyses，including 2D and 3D finite element analyses，joint analysis and design calculation on consideration of all working conditions，were made for the inner forces and deformation behavior of the joint of beam － column of a subway station constructed with top － down method to solve the key design problems． According to the measured data on the deformation and born load of the structure，the design parameters and construction procedures were adjusted to ensure the smooth completion of the design and construction．
Research conclusions: For the design and construction of joint of reinforcement concrete steel tube column and reinforcement concrete beam － slab structure，a structural form called combination structure of steel ring plate －reinforcement concrete ring beam is presented． In which，the steel ring plate bears the shear force and reinforcement concrete ring beam bears the moment respectively． This kind of joint has the following advantages: clear load distribution，easy construction and being produced in factory to ensure its quality and reduce the construction cost and time．
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Received: 10 January 2011
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2011, Vol. 28 
