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CEE 214 10/28/09 STRUCTURAL ANALYSIS LAB Introduction to Finite Element Models NOTE: 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: http://www.oasys-software.com/information/universities.shtml All page references in the lab refers to Structural Analysis lecture slides from October 26 available at: http://www.stanford.edu/class/cee214/Lectures/Flager.pdf OVERVIEW The lab will involve creating a finite element analysis model of the Washington monument to simulate structural behavior. LAB INSTRUCTIONS 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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