Description | Eurocodes (EC3/EC8) | AISC/ASCE | Remarks |
Energy dissipation philosophy | EBFs shall be designed so that specific elements or parts of elements called seismic links are able to dissipate energy by the formation of plastic bending and/or plastic shear mechanisms. | EBFs are expected to withstand significant inelastic deformations in the links when subjected to the forces resulting from the motions of the design earthquake. | An almost same criterion is considered |
Rotation capacity (local ductility concept) | Plastic hinge rotation is limited to 35 mrad for structures of DCH and 25 mrad for structures of DCM | Link rotation angle shall not exceed (a) 0.08 radians for links of length 1.6 Mp/Vp or less and (b) 0.02 radians for links of length 2.6 Mp/Vp or greater. | For high seismicity it is recommended by both codes to apply ductility concept |
Dissipative members | Plastic Hinges should take place in links prior to yielding or failure elsewhere. | EBFs are expected to withstand significant in-elastic deformations in the links when subjected to forces resulting from the motions of the design earthquake. | Links can be short, long and Intermediate. Which fail due to Shear, bending and bending & Shear respectively. |
If then Check for Design Resistance of Link is |
| Effect of axial force on the link, available shear strength need not be considered if (LRFD) or (ASD) | NED, MED& VED respectively are the design axial force, design bending moment and design shear at both ends of the link. |
Check to achieve global dissipative behaviour of the structure | The maximum overstrength Ωi should not differ from the minimum value Ω by more than 25% | The required strength of each lateral brace at the ends of the link shall be , where h0 is the distance flange centroids | among all short links and minimum value of among all intermediate and long links. |
Seismic load reduction factor | A behaviour factor (q) equal to 4 for DCM and 5αu/α1 for DCH is provided. | A response modification factor (R) equal to 8.0 for EBFs is given | An almost same criterion is considered |
Overstrength factor | the minimum value of among all short links, whereas the minimum value of among all intermediate and long links; | Ωo equal to 2 for EBFs is given | Ωo in EC8 is (1.1γovΩ) |