Nonlinear Static and Dynamic Analysis of Steel Structures with ...

Chapter 1 Design of steel structures with Eurocode 3
16
M j,Rd
2/3 M j,Rd
M j,Ed
M j
S j,ini
a) Mj,Ed ≤ 2/3 Mj,Rd b) Mj,Ed ≤ Mj,Rd
Fig. 1.10: Rotational stiffness to be used in elastic global analysis
Type of connection Beam-to-column
joints
Other types of joints
(beam-to-beam
joints, beam splices,
column base joints)
Welded 2 3
Bolted end-plate 2 3
Bolted flange cleats 2 3,5
Base plates - 3
Table 1.10: Stiffness modification coefficient ε
Rigid-plastic global analysis
(1) The joints should be classified according to their strength, see 1.4.7.
(2) For joints connecting H or I sections Mj,Rd is given in EN 1993-1-8, 6.2.
(3) For joints connecting hollow sections the method given in EN 1993-1-8, section 7 may
be used.
(4) The rotation capacity of a joint shall be sufficient to accommodate the rotations
resulting from the analysis.
(5) For joints connecting H or I sections the rotation capacity should be checked according
to EN 1993-1-8, 6.4.
Elastic-plastic global analysis
(1) The joints should be classified according to both stiffness and strength (see 1.4.7).
(2) For joints connecting H or I sections Mj,Rd is given in EN 1993-1-8, 6.2, Sj is given in
EN 1993-1-8, 6.3.1 and θCd is given in EN 1993-1-8, 6.4.
(3) For joints connecting hollow sections the method given in EN 1993-1-8, section 7 may
be used.
(4) The moment rotation characteristic of the joints should be used to determine the
distribution of internal forces and moments.
(5) As a simplification, the bilinear design moment-rotation characteristic shown in Figure
1.11 may be adopted. The stiffness modification coefficient should be obtained from Table
1.10.
M j,Rd
M j,Ed
M j
S j,ini /