Abstract：Research purposes: The pile － board structure is a new type of foundation reinforcement structure with complex structure style． Now in the wide application of the pile － board structure for subgrade，how to establish the reasonable calculation model and how to get the internal force and deformation with the reasonable calculation method are the most urgent problems to be solved． Based on the principle of the equivalent replacement frame method，in this paper， the plane simplified rules for all kinds of the pile － board structure of subgrade are offered，the plane member bar calculation model is established，the analytical calculation for getting the internal force and deformation of the structure is presented on the basis of stiffness method and foundation coefficient method and taking beam － type pile － board structure as an example，the explanation is given to the main calculation formula and concrete solving ideas．
Research conclusions: Now，substitution of simplified plane member bar mechanic calculation model for the actual structure of the pile － board structure is an available and the most efficient way． The analytical calculation method for getting the structure internal force of the plane member bar mechanic model presented in this paper based on the stiffness method and foundation coefficient method is available for all kinds of pile － board structure，and the obtained result of the internal force of the structure is reasonable and reliable and can be as the control solution．
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TB 10002． 5—2005，Code for Design on Subsoil and Foundation of Railway Bridge and Culvert［S］．
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2011, Vol. 28 
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