This paper presents a numerical method called the finite strip plasticity coefficient increment initial stress method for sloving the ultimate load of elastic-plastic stability of steel columns. Step loading and finite strip principle are employed to establish the incremental equilibrium equation of structures.
The calculated settlement and pore water pressure were presented and compared with the situ values. The results show that both the peak of the pore pressure and the settlement calculated by nonlinearity elastic model are bigger than that of linearity elastic model, and the nonlinearity elastic model can simulate the behavior of the settlement and the pore pressure dissipation more exactly during the step loading process.
In light of the problem of describing nonlinear rheology of rock and soil with principle of linear superposition,a neural network model for rheology of rock and soil under step loading has been established with artificial neural network instead of traditional mathematical and mechanical methods.
By simulating the experimental creep curves of gypsum breccias,it is shown that the model can effectively describe nonlinear rheology of rock and soil with better prediction. This approach provides a new way for studying rheological properties of rock and soil especially nonlinear rheological properties under step loading.
The new method is also compared with BP artificial neural network model and traditional hyperbola method. The prediction results indicate that the SVM model has a better prediction ability than BP neural network model at the same training set mean-square error. Utilizing the settlement data under multi-stage loading,SVM model has a better reflection for foundation soil deformation trend compared with hyperbola method only using the data under pre-loading.
Evaluating the formulas by the multi stage loading creep test data for two kinds of Cr Mo V steels,it has been proven that the prediction results of the formulas are more accurate than those of the linear law.
strain developed in a specimen under step-by-step loading was measured.
In this paper, to begin with, the nonlinear differential equations of a truncaled shallow spherical shell with variable thickness under uniformly distributed load are linearized by step-by-step loading method.
One-dimensional wave propagation in column under step loading and impulsive loading are analyzed with the developed finite element program.
The quasi-static behavior of the viscoelastic Timoshenko beam under step loading is analyzed and the analytical solution is obtained.
The quasi-static behavior of the viscoelastic Timoshenko beam under step loading was analyzed and the analytical solution was obtained in the Laplace transformation domain.
Let its dynamic buckling under step load be reduced to a bifurcation problem caused by the propagation of axial elastic-plastic stress wave.
The infinitely long layers are joined together by an elastic bonding agent and one of the layers is subjected to a step load which moves with a constant speed along the layer.
Metastability and chaoslike phenomena in nonlinear dynamic buckling of a simple two-mass system under step load
Nonlinear dynamic buckling of nonlinearly elastic dissipative/nondissipative multi-mass systems, mainly under step load of infinite duration, is studied in detail.
A set of wave propagation and structural dynamics problems, subjected to various load forms such as Heaviside step load, triangular blast load and ramped wind load, are modelled using the new approach.