| With the rapid development of building structure style all the world in recent years, increasingly complex and diverse body of the construction of the functional requirements, construction of the load multiplied, as to be capable of sustaining large loads and strong durability of concrete, deep beams are on more and more in the engineering. Because the thickness is much smaller than the length and width, and no load on the direction of thickness, deep-beam belongs to thin-wall problems which belongs to plane stress problems.The Truss Model Method is a approximation for concrete structure, which not only able to consider extension, bending, shearing and distortion at the same time, but also can give a good expression of the force and power-transmission way of the internal structure. With the development of computer technology and the large use of finite element method in engineering, the Truss Model Method gets great progress. It was reached a mature stage aboard, but has just begun at home.Base on the flexibility analysis, the establishment of truss model for deep beams in a variety of condition will be given, which are used for design reference.In this Paper a stiffness matrix for isoperimetric finite element was derived. The correctness of the stiffness matrix is checked by an example. A program which can analysis plane problems is given. In order to avoid the cumbersome design of deep beams of the finite element method, a variety of condition of deep beams are calculated and analyzed by using the program. According to the principle stresses of the points calculated on deep beam, principal stress trace and horizontal curve of the cross-section are draw out, and the truss model for the deep beam are put forward. Then visual reference is put out when designer establish the truss model. Designer should chose the most effective truss model, and interfere the internal forces targeted delivery artificially, in order to better meet the increasingly complex needs of the construction.
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