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T3 TrussMT Tutorial 6.8

T3 TrussMT Tutorial 6.8 - PLANAR TRUSS STRUCTURE ANALYSIS...

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P LANAR T RUSS S TRUCTURE A NALYSIS - M ODEL T REE V ERSION T3-1 T UTORIAL T3 P LANAR T RUSS S TRUCTURE A NALYSIS - M ODEL T REE V ERSION Tutorial T3 emphasizes the Model Tree alternative to using the Menu bar and the Module menu, etc., for running through what is essentially the same material as Tutorial T2. Frequent use of the context sensitive Toolbox area is good practice in either case. The Model Tree shown below provides a visual description of the hierarchy of items in the model database along with access to most of the functionality in Abaqus/CAE. The Model Tree Tips button or "light bulb" button ( ) above the Model Tree provides a quick summary of the functionality that is provided, along with a summary of keyboard shortcuts. Upon using mouse button 3 (MB3; the right-most button of the mouse) to select an item in the tree, a pop-up menu appears listing the commands associated with the item that then may be selected in the usual way with MB1 (the left-most mouse button). The command shown in bold type in the pop-up menu is the default command, and may be executed directly by merely double-clicking the Model Tree item using MB1. Also, toggling the "+" or "-" signs expands/ collapses Model Tree items. 1 1 See also Section 3.5 "Working with the Model Tree" in the ABAQUS/CAE User's Manual.
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P LANAR T RUSS S TRUCTURE A NALYSIS - M ODEL T REE V ERSION T3-2 Each item in the Model Tree showing a number in parentheses is referred to as a container , and the number reveals the number of such items it contains. The Model Tree shown is empty (except for the Steps container, which contains one initial load step by default). Items in the Model Tree can neither be deleted nor reordered. Their order closely mirrors the order of Modules in the Module menu, which is a logical order for constructing a model database. Consider the symmetrical truss structure and load system shown below, which was also the subject of Tutorial T2. The material used is steel having a modulus of elasticity E equal to 29.0 × 10 6 psi , and the cross-sectional area A equals 1.0 in 2 for all members. A finite element structural analysis is to be performed using Abaqus/CAE. Symmetry is to be exploited in the analysis. The deflections at each joint, the reaction forces at the supports, and the forces and stresses in each member are to be computed. As also stated in Tutorial T2, whenever symmetry exists in the geometry, loading, and material properties for a structure, the analyst should be able to recognize this symmetry and exploit it in the analysis of the structure. In addition to featuring the Model Tree, the methodology for exploiting symmetry is featured in this tutorial. * Launch Abaqus/CAE. Start\Programs\Abaqus 6.8-1\Abaqus CAE * Begin by creating a model database.
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