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Direct stiffness method
About: Direct stiffness method is a research topic. Over the lifetime, 2584 publications have been published within this topic receiving 53131 citations.
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TL;DR: In this article, the exact anti-axisymmetric (cylindrical SH-waves) and axisymetric stiffness matrices for a layered poroelastic half-space were derived, and the dynamic responses due to buried spherical SH-, P1-, P2-and SV-waves were studied by using the direct stiffness method combined with the Hankel transform.
15 citations
TL;DR: In this article, a statistical two-order and two-scale method is developed for predicting the mechanics parameters, such as stiffness and strength of core-shell particle-filled polymer composites.
Abstract: The statistical two-order and two-scale method is developed for predicting the mechanics parameters, such as stiffness and strength of core-shell particle-filled polymer composites. The representation and simulation on meso-configuration of random particle-filled polymers are stated. And the major statistical two-order and two-scale analysis formulation is briefly given. The two-order and two-scale expressions for the strains and stresses of conventionally strength experimental components, including the tensional or compressive column, the twist bar and the bending beam, are developed by means of their classical solutions with orthogonal-anisotropic coefficients. Then a new effective mesh generation algorithm is presented. The mechanics parameters of core-shell particle-filled polymer composites, including the expected stiffness parameters, minimum stiffness parameters, and the expected elasticity limit strength and the minimum elasticity limit strength, are defined by means of the stiffness coefficients and elasticity strength criterions for core, shell and matrix. Finally, the numerical results for predicting both stiffness and elasticity limit strength parameters are compared with the experimental data.
15 citations
TL;DR: In this paper, the stiffness of flexible transmissions in robots with variable stiffness actuation in agonistic-antagonistic configuration is estimated using a dynamic residual that provides a filtered version of the unmeasured flexibility torques, combining it with a recursive least squares algorithm that fits a polynomial model to the data, and proceeding then by analytical derivation.
15 citations
TL;DR: In this paper, an initial internal force (IIF) method for pre-construction analysis of a prestressed space grid structure is proposed, which can be applied to linear analysis of prestressed structures.
15 citations
TL;DR: In this article, an eight-node arbitrary quadrilateral membrane elements with drilling degrees of freedom with compatible displacement interpolation within the element was developed specifically for analyzing the in-plane stiffness of thick floor plates in building systems, particularly transfer plates in tall buildings as well as pile caps.
Abstract: The development of eight-node arbitrary quadrilateral membrane elements with drilling degrees of freedom is presented using the compatible displacement interpolation within the element. The element is considered to develop specifically for analysing the in-plane stiffness of thick floor plates in building systems, particularly the transfer plates in tall buildings as well as pile caps. With a new set of shape functions and following the displacement-based element procedure, the element stiffness and force vector are derived and nodal displacements are obtained after solving the simultaneous equations; the element stresses are then determined. A wide range of patch tests is conducted to evaluate the consistency and stability of the proposed element. The test results show very good agreement with the exact solutions of the beam theory. Numerical investigations are carried out, showing that the analyses using the proposed elements provide better results than those from the existing methods. Copyright © 2008 John Wiley & Sons, Ltd.
15 citations