Steel Buildings in Europe

Title APPENDIX D Worked Example: Design of portal frame using elastic analysis 35 of 44 4 - 116 From the geometry of the haunch, the following properties can be obtained for each of the cross-sections 1 to 5, as shown in Table 2. Table 2 Section properties of haunched member at cross-section, as per figure above Cross- section no. Cutting depth (mm) Overall depth (mm) Gross area, A (mm 2 ) I y (mm 4 ) W el,min (mm 3 ) N Ed (kN) M Ed (kNm) 1 503 953 15045 200500 4055 129 661 2 378 828 13870 144031 3348 129 562 3 252 702 12686 98115 2685 128 471 4 126 576 11501 62258 2074 127 383 5 0 450 9880 33740 1500 127 298 The section properties are calculated normal to the axis of the section. For simplicity, the section properties above have been calculated assuming a constant web thickness of 9,4 mm and neglecting the middle flange. The actual and the equivalent cross-sections are shown in the following figure for cross-section No.1: 190 190 210 210 11,1 9,4 9,4 953 503 450 14,6 14,6 17,2 Actual cross-section Equivalent cross-section For cross-section No.1 the values of N Ed and M Ed are taken at the face of the column. 8.1. Cross-section classification 8.1.1. The web The web can be divided into two webs, and classified according to the stress and geometry of each web. The upper section (i.e. the rafter) is called the upper web and the lower section (i.e. the cutting) is called the lower web.