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Build Etabs or Equest model for classroom - Stanford University


									CEE 214                                                                                          10/28/09

                                 STRUCTURAL ANALYSIS LAB
                            Introduction to Finite Element Models


       We will be using GSA software for structural analysis. This software is installed on selected CIFE
        lab computers. It can be downloaded free of charge for academic use at:
       All page references in the lab refers to Structural Analysis lecture slides from October 26
        available at:


The lab will involve creating a finite element analysis model of the Washington monument to simulate
structural behavior.


1. Construct geometry
   Monument geometry will be approximated as a collinear set of 1-D elements
   1.1. Nodes: Create nodes at each change of cross section as shown in the lecture slides, pg 6.
   1.2. Elements: Create 1-D elements between the nodes.

2. Define structural properties
   2.1. Support conditions: Assign a “fixed” support to the base node.
   2.2. Section properties: Create section properties for each of the 4 x-sections shown on pg 6. Use
        “Concrete short-term” to approximate the stone material. Create an additional section
        property which represents an average x-section for the structure.

3. Define loading
   3.1. Dead loads: Create dead load cases for “stone” and “elev+stairs”. Define a gravity load for
        “stone” and a beam line load for “elev+stairs” according to the value on pg 11.
   3.2. Wind Loads: Create load cases for “wind-line” (uniform beam load) and “wind-point” (point
        loads at every 100ft). See pg 13 for reference.
   3.3. Load Combinations: Define two combinations that combine dead loads with each wind case.

4. Calculating Results
   4.1. Reactions: Run the analysis and view the reactions for each load case / combination.
   4.2. Deflections: View the deflections for each load case / combination.
   4.3. Internal Forces: View the shear and bending moment diagrams for each case / combination.
   4.4. Internal Stresses: Calculate stresses for the structure as a single x-section and when broken
        into 4 different x-sections.

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