Analysis of Structural Internal Force and Settlement on Nonlinear Elastic Foundation Based on Compression Curve

Foundation settlement is not only harmful to buildings, but also one of the main factors affecting the stress and deformation of superstructure. The layerwise summation method used in engineering settlement calculation takes the compression curve (e-p curve or e-lgp curve) as the input, which better reflects the nonlinearity of soil deformation and has good accuracy. A numerical calculation method of elastic foundation was developed in this research. Based on the compression curve, the tangent elastic modulus was obtained through the derivation of elastic theory, and the nonlinear finite element method was used for calculation. The example shows that this method is essentially the same as the layerwise summation method in the calculation of foundation settlement, and obtains rich results without the cumbersome manual calculation process. The stress and deformation analysis of superstructure can also better reflect the influence of elastic foundation. The calculation method of nonlinear elastic foundation based on compression curve does not need complex geotechnical test, and avoids the disadvantage of simple linear elastic constitutive model, so it has strong practical value.