Lateral torsional buckling of an I-shaped hoisting spreader beam

Global hydroelastic ship response comparison of numerical model and WILS model tests

It is nowadays well recognized that the hydroelastic ship response might be an important part of the overall ship structural response. We usually talk about two phenomena: namely springing and whipping, even if sometimes it is not trivial to distinguish between the two of them. Usually, springing is defined as a continuous resonant wave-induced...

Design rules for lateral torsional buckling of channel sections subject to web loading

Channel sections are widely used in practice as beams. However, design rules for eccentrically loaded (not through shear centre) beams with channel cross-sections are not available in Eurocode 3. In this paper five proposed design rules are summarised, explained and their validity is checked by Finite Element analyses. The design rules yield...

Motion sickness provoked by torso rotation

Buckling of coped steel beams and steel beams with partial endplates

Copes and partial endplates influence the resistance to lateral buckling of a steel beam. In order to quantify this influence, numerical research has been carried out with validated models. Full-scale laboratory tests carried out for the validation of the numerical models are described in the Annex to this paper. The research resulted in...

Numerical simulation of lateral-torsional buckling of coped girders

The lateral torsional buckling resistance of girders depends on the support conditions. In floor structures for buildings, coped girders are often used. A numerical model was developed to research the influence of copes on lateral buckling resistance. The model is successfully validated with tests. This paper describes the background of the...

Lateral-torsional buckling capacities of coped girders

The lateral torsional buckling resistance of girders depends on the support conditions. In floor structures for buildings coped girders are often used. In a recent study, a numerical model was developed to investigate the influence of copes on the lateral buckling resistance. This model is described in an companion paper [ 1 J. In this paper...

FEM simulations of lateral torsional buckling experiments on channel sections loaded in bending

The lateral torsional buckling behaviour of hot rolled channel sections subjected to bending is studied in an overall project. The final objective of this project is to develop a design method. This paper concentrates on the validation of the FEM model against the experiments. For channel sections loaded through the shear centre (centric loading...

Lateral torsional stability of members with lateral restraints at various locations between the supports

This paper provides a general procedure to determine the elastic critica! (Euler) lateral torsional buckling moment of a member with lateral restraints at various locations between the supports. The mathematica) procedure to solve the eigenvalue problem is presented and some design examples are presented. The effectiveness of the locations on...

Are neck flexion, neck rotation, and sitting at work risk factors for neck pain? Results of a prospective cohort study

Objective: To study the relation between neck pain and work related neck flexion, neck rotation, and sitting. Methods: A prospective cohort study was performed with a follow up of 3 years among 1334 workers from 34 companies. Work related physical load was assessed by analysing objectively measured exposure data (video recordings) of neck...

Adsorption and kinetic effects on crack growth in MnZn ferrites

The variation of the fracture toughness of MnZn ferrite ceramics with varying loading rate and humidity was determined with the aid of the single edge notched beam (SENB) test. A strong decrease with increasing humidity and decreasing loading rate was observed. A model for subcritical crack growth incorporating kinetic and adsorption effects was...

Contribution of the otholiths to the human torsional vestibulo-ocular reflex

The dynamic contribution of the otoliths to the human ocular torsion response was examined during passive sinusoidal body roll about an earth-horizontal axis (varying otolith input) and about an earth-vertical axis (unvarying otolith input). At a fixed amplitude of 25°, the stimulus frequency was varied from 0.05 to 0.4Hz. The otoliths affected...

Cervically induced ocular torsion: Physiological and clinical aspects

Five healthy subjects were submitted to sinusoidal lateral tilt (amplitude 25° at frequency of 0.2Hz) of the whole body, only the head, or only the trunk about a vertical (subject in upright position) and about a horizontal axis (subject in supine position). The ocular torsioation of the neck by manipulating only the trunk had a negligible...

Saccular impact on ocular torsion

When someone is tilted laterally the sheer force on the maculae of the utriculus and the sacculus is described by the sine and the cosine of the angle of tilt, respectively. So both the sacculus and the utriculus are stimulated, but in the litera-ture ocular torsion is normally attributed to utricular function alone (and thus seen as a response...

Determination of ocular torsion by means of automatic pattern recognition

A new, automatic method for determination of human ocular torsion (OT) was devel-oped based on the tracking of iris patterns in digitized video images. Instead of quanti-fying OT by means of cross-correlation of circular iris samples, a procedure commonly applied, this new method automatically selects and recovers a set of 36 significant...

Ocular torsion before and after 1 hour centrifugation

To assess a possible otolith contribution to effects observed following prolonged expo-sure to hyper gravity, we used video-oculography to measure ocular torsion during static and dynamic conditions of lateral body tilt (roll) before and after one hour of centrifugation with a Gx-load of 3G. Static tilt (from 0 to 57 deg. to either side) showed...

Application problems of a biomechanical model in improving roofwork

The compression force during traditional roofwork and improved roofwork was calculated by means of a two-dimensional static biomechanical model. The improvement resulted in a 30% reduction in compression force, but also influenced factors which cannot be incorporated into the model but may cause back injuries. The frequency and velocity of...