Steel E =29000 ksi, Poissons Ratio = Pinned base All beam-column connections are rigid Beams: W24X55, Fy = 36 ksi Columns: W14X90, Fy = 36 ksi Beam Span Loading On All Beams klf Dead Load (not including steel frame member self weight) klf Live Load Lateral Loading (Earthquake) As indicated in the figure Unbraced Lengths Assume columns are laterally supported at each floor level Assume beams are braced at 10 feet on center | Problem K Steel Moment Frame Steel E 29000 ksi Poissons Ratio Pinned base All beam-column connections are rigid Beams W24X55 Fy 36 ksi Columns W14X90 Fy 36 ksi Beam Span Loading On All Beams klf Dead Load not including steel frame member self weight klf Live Load Lateral Loading Earthquake As indicated in the figure Unbraced Lengths Assume columns are laterally supported at each floor level Assume beams are braced at 10 feet on center To Do Determine stress ratios using AISC-ASD89 due to DL LL and EQ loads. Note Our intent is that you try this problem on your own first. After you have solved it on your own you can step through our solution if desired. If you have problems trying to create the model then follow the steps in our solution. 1 Problem K Solution 1. Click the drop down box in the status bar to change the units to kip-ft. Kip-ft 30 2. 3. From the File menu select New Model From Template. This displays the Model Templates dialog box In this dialog box click on the Portal Frame template Portal Frame dialog box button to display the 4 In this dialog box Type 3 in the Number of Stories edit box Type 3 in the Number of Bays edit box Accept the default value of 12 in the Story Height edit box Type 20 in the Bay Width edit box Click the OK button 5. Click the X in the top right-hand corner of the 3-D View window to close it. 6. Click the drop down box in the status bar to change the units to kip-in. Kip-in 30 7. From the Define menu select Materials. to display the Define Materials dialog box. 8. Click on STEEL in the Materials area to highlight select it and then click the Modify Show Material button. The Material Property Data dialog box is displayed. 9. In this dialog box Verify that the Modulus of Elasticity is 29000. Verify that Poisson s Ratio is Verify that the Weight per Unit Volume is . Verify that the steel yield stress is 36. Click the OK button twice to exit all dialog boxes. 10. Click the drop down box in the status bar to .
