Steel Section Design and Connections Tutorial - Kxcad.net

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T2.2.4 Designing the Rafter Section We will use the same design brief to select a suitable rafter section in which the bending moment and moment of resistance are as close as possible. Select Axially Loaded Members with Moments from the Integrated Design menu Click on the outer left hand rafter Click on the section list down arrow and select section 457x152 UB 52 Note the bending moment diagram. Click on the section list down arrow and select section 406x140 UB 46 Please note that the small amount of over-stressing at the end of the haunch will be eliminated when the plastic hinges are formed and the moments are redistributed. Click on the Store button Select Current Group Click on Change T2.2.6 Designing the Inner Column Sections We will use the same design brief to select a suitable rafter section in which the bending moment and moment of resistance are as close as possible. Select Axially Loaded Members with Moments from the Integrated Design menu Click on the inner left hand column Change to Copy Current Brief Mode Click on other (right hand) inner column Return to Search for Next Brief Mode Click on the ‘AutoSize Current Member’ button Click on the Store button Select Selected Members Selected members are highlighted in red. Select only the two inner columns, deselecting any other members highlighted. Click on Change Click on Re-Analyse T2.2.7 Review the AutoCheck Having re-analysed the frame with the new sections, let us view the results of AutoCheck T2 Multi-bay Portal Frame Design Tutorial T2 - 10
Select the AutoCheck - Group Check from the list of existing Design Briefs: Design Brief 1 of 2 (bottom left hand corner of screen) The results indicate that the outer columns are slightly over stressed (shown in red). Other values indicate that the sections selected for the various members are all appropriate for plastic analysis (please note that plastic analysis is a form of moment re-distribution). T2.2.8 Placing the Plastic Hinges Select the Axial With Moments check for the outer left hand column from the list of existing Design Briefs: Design Brief 2 of 2. From the Options menu, select Plastic Hinges Select Apply To Mode Click on the lower part of the right hand column Click on the Add button Click on the lower part of the left hand column Click on the Add button Click on the Re-Analyse button T2.2.9 Changing the Haunch Dimensions Click on 1 st , 2 nd and 3 rd rafter in turn The applied moment at the end of the haunch is very close to the section capacity. This is likely to require lateral restraints at close intervals. To avoid the above, let us increase the haunch length by say 400 mm. Click on the Section AutoDesign tab Click once on the top of the spin button to increase the haunch Dep1(H/D) to 2.05 Click several times on the top of the spin button to increase the increment to 0.400 Click on the top of the spin button to increase the haunch length XH1(m) to 2.8 Click on the Store button Select Current Group Click on Change Click on Re-Analyse T2 Multi-bay Portal Frame Design Tutorial T2 - 11
Page 1 and 2: T2 Multi-Bay Portal Frame Tutorial
Page 3 and 4: 2.2 General File Management T2.1.3
Page 5 and 6: Where: D1 Dead Loads L1 Live Loads
Page 7 and 8: T2.2 MasterKey: Sections We will no
Page 9: Select Axially Loaded Members with
Page 13 and 14: The outer columns require two torsi
Page 15 and 16: T2.2.14 Checking for Failures Click
Page 17 and 18: T2.3 MasterKey : Moment Connections
Page 19 and 20: area Click on the Auto button in Au

Steel Section Design and Connections Tutorial - Kxcad.net

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