There are several idealizations in numerical analysis of structures. In the joints and supports, which is usually assumed to be pinned or rigid, semi-rigid connection should be considered to obtain more realistic, reliable and also economical results. In this study, rotational spring stiffness-connection ratio relation is clearly explained and revealed. A finite element program SEMIFEM is devel...

A bar-slider framework is a bar-joint framework a part of whose joints are constrained by using line-sliders. Such joints are allowed to move only along the sliders. Streinu and Theran proposed a combinatorial characterization of the infinitesimal rigidity of generic bar-slider frameworks in two dimensional space. In this paper we propose a generalization of their result. In particular, we prov...

External distraction using a rigid external distractor (RED) frame (RED frame II, KLS-Martin, Jacksonville, USA) is frequently used for maxillary distraction and reconstruction.[1-3] Airway management with the RED frame could be a greater risk of failed intubation/extubation. It could significantly interfere with ventilation with a face mask or intubation by direct laryngoscopy. However, anaest...

We develop the equations of motion for full body models that describe the dynamics of rigid bodies, acting under their mutual gravity. The equations are derived using a variational approach where variations are defined on the Lie group of rigid body configurations. Both continuous equations of motion and variational integrators are developed in Lagrangian and Hamiltonian forms, and the reductio...

It is proved that in classical electrodynamics the uniform rectilinear motion of charged " rigid " sphere with self-action (Sommerfeld model) is stable. 03.50.De In classical electrodynamics long time ago in Sommerfeld works [1, see also 2] was derived the expression of self-force acting on " nonrelativistically rigid charged sphere " , i.e sphere with radius a, its center moving along trajecto...

In order to evaluate the stress state and working performance of a rigid frame bridge after reconstruction extension, load test transverse distribution were carried out. Static is at each section main beam under action partial medium load. Dynamic used inherent fundamental frequency, damping ratio impact coefficient through pulsation sports car test. The results show that first vibration mainly...