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Application Sheets:: Difference between revisions
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[[File:Image application sheets.png|center|frameless|1200x1200px]] | [[File:Image application sheets.png|center|frameless|1200x1200px]] | ||
== Crane Tension Cable | == Crane Tension Cable == | ||
''' | === '''Context''' === | ||
Design of a tower crane | |||
=== '''Objective''' === | |||
To assess the adequacy of the cable stay for the jib | |||
=== Concepts used in this application sheet === | |||
Force: applied load, moments, force resolution | |||
=== Engineering model === | === Engineering model === | ||
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==== Validation ==== | ==== Validation ==== | ||
The force in the cable may be significantly less than the estimated value because of the assumption of the pin connection for the jib. Overestimating the force is a safe assumption. Crane collapses are relatively common and can result in deaths. Therefore, a higher than normal factor of safety is used to ensure the crane will not be overloaded. | The force in the cable may be significantly less than the estimated value because of the assumption of the pin connection for the jib. Overestimating the force is a safe assumption. Crane collapses are relatively common and can result in deaths. Therefore, a higher than normal factor of safety is used to ensure the crane will not be overloaded. | ||
== Glasgow Central Station Truss == | |||
=== '''Context''' === | |||
Roof truss in the main concourse of the Glasgow Central Station | |||
=== '''Objective''' === | |||
Estimating the size of members in an existing truss based on bending | |||
=== Concepts used in this application sheet === | |||
* Force: applied load, point load, internal force, resolution into components | |||
* Equilibrium: equilibrium equation, force equilibrium | |||
* Free Body Diagram | |||
=== Engineering Model === | |||
[[File:Status-truss-sch-model.png|frameless|707x707px]] | |||
=== Structural Analysis === | |||
==== Analysis Model ==== | |||
[[File:Station-truss-sch-analysis.png|frameless|719x719px]] | |||
For this calculation only axial forces in the members are taken into account i.e. moment continuity is neglected. | |||
==== Calculations ==== | |||
Two of the heavily loaded members are the end diagonal AB and the top chord DE at the centre of the beam. | |||
Calculate the force in the end diagonal AB: | |||
Caclulate the support reaction at A and H: | |||
Total load on the truss: <math>500kN</math> | |||
Vertical support reaction: <math>\frac{500}{2}=250kN</math> | |||
* | * | ||