Abstract：Research purposes: Tianjin Yujiapu underground railway station without columns in the platform supports a single － layer conch － shaped steel shell which is 143 meters in span． To resolve the difficulties such as heavy load， large span ，bearing shell supports which are not on the columns，great horizontal loads of shell on the underground structure，absence of most of the top plate under the shell and large span cantilever plate besides the great elliptic hole， underground structure system must be elaborately researched． Finite element method is applied on the research of two structure systems including frame structure and arch structure．
Research conclusions:(1) Although the top beam moments of arch system are much smaller than that of frame system， the concrete structure is still not capable enough for the main beams． (2) Large tension axial forces are caused in beams by large span of beams，different distance of columns and absence of most of the top plate under the shell． (3) The section of the arch is designed as plat top and arch bottom to support the shell ，while its arch effect is weaken． (4) Consider the features of Yujiapu station，frame structure is more reasonable than arch structure．
张晨明董秀竹 王 欣铁道第三勘察设计院集团有限公司， 天津 300251. 于家堡枢纽站房南段地下结构体系研究[J]. 铁道工程学报, 2012, 29(6): 92-95.
ZHANG Chen － ming，DONG Xiu － zhu，WANG Xin. Research on Underground Structure System of South Part of Yujiapu Railway Transition Junction. 铁道工程学报, 2012, 29(6): 92-95.
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2012, Vol. 29 
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