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Abstract The influences of nonlinear characteristics of concrete and soil on bending moment of foundation beam are investigated by the finite element method(FEM). Four kinds of different calculation modes are considered，in which soil and concrete are taken as linear or nonlinear materials. It is concluded that the bending moment considering the nonlinear characteristics of concrete and soil is smaller than that of assuming concrete and soil as linear materials. Nonlinear characteristics of concrete and soil should be considered in order to obtain a more accurate bending moment；and it is，for the minimal demand，to consider the nonlinear characteristic of soil for the rigid beam and the nonlinear characteristics of concrete for the flexible beam，if it is very difficulty to consider nonlinear characteristics of concrete and soil at some time. The influence of reinforcement ratio on bending moment under design load is not obvious. Besides，a formula of the discount coefficient of the bending moments is presented，which is defined as the ratio of the bending moment considering the nonlinear characteristic of concrete to bending moment from the Guo¢s Tables. Using the discount coefficient，bending moment considering the nonlinear characteristic of concrete is easily obtained by the bending moment from the Guo¢s Tables.
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Received: 13 April 2005
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