Abstract The key issue for establishing calculating model of segments is to consider the influence of the joint and ground resisting force to the structure. The simplification of joint in the routine method model is improved. The calculation model which treats all the cross-section stiffness of segments as EI and the joint stiffness of segments as kEI coincides with the actual situation. Combining with the real data of the project of Beijing Metro Line No.10，the segments inner forces are calculated by the routine method model and its improved model，homogenous ring model and its improved model respectively. According to the numerical calculation results，the improvement of the rotating stiffness of joint in shield tunnel segments are found effective and feasible and also necessary；it can preliminarily determine that the reasonable stiffness reduction factor value of the rotating stiffness of joint in shield tunnel segments is 1/100–1/1 000.
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Received: 16 November 2006
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