Abstract：Abstract : Research purposes : The investment of subway station construction accounts for about 60% of the total investment. Accordingly，reasonably controlling the investment of station construction is one of the keys to reduce the cost of urban rail transit project. Now，the box frame structure With longitudinal frame beam and transverse large span slab is generally used in underground island platform subway station， and the column grid can be designed as no column，single column and double column form. This paper，taking Wuhan metro as the background，studies reasonable structural layout scheme in mechanical behavior and economy by analyzing the economic index of diferent platform width and different column grid of double decked island - platform underground station. Research conclusions : Through the comparison，the following conclusions are drawn ： ( 1) The platform width of 10 ? 12 m in the form of single column and double spans is reasonable in mechanical behavior and economy. Also， the platform width of 13 ?15 m with double column and three spans is reasonable. (2) When the platform width is 13 m， the form of single column and double spans is the most optimal in economy，and also the station function significantly increased. So，when the condition is allowed，this form is recommended. (3) The research results can be widely used in the design and construction of urban rail transit underground station.
2016, Vol. 33 
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