Alcan Structural Engineering

Structural types and behaviour factors Structural types 1

• Building A New Home Or Home Improvement

(1)P Composite steel-concrete structures shall be assigned to one of the following structural types according to the behaviour of their primary resisting structure under seismic actions:

a) Composite moment resisting frames are those with the same definition and limitations as in 6.3.1(1)a, but in which beams and columns may be either structural steel or composite steel-concrete (see Figure 6.1);

b) Composite concentrically braced frames are those with the same definition and limitations as in 6.3.1(1)b and Figures 6.2 and 6.3. Columns and beams may be either structural steel or composite steel-concrete. Braces shall be structural steel;

c) Composite eccentrically-braced-frames-frame-characteristics.html">eccentrically braced frames are those with the same definition and configurations as in 6.3.1(1)c and Figure 6.4. The members which do not contain the links may be either structural steel or composite steel-concrete. Other than for the slab, the links shall be structural steel. Energy dissipation shall occur only through yielding in bending or shear of these links;

d) Inverted pendulum structures, have the same definition and limitations as in 6.3.1(1)d (see Figure 6.5);

e) Composite structural systems are those which behave essentially as reinforced concrete walls. The composite systems may belong to one of the following types:

- Type 1 corresponds to a steel or composite frame working together with concrete infill panels connected to the steel structure (see Figure 7.1a);

- Type 2 is a reinforced concrete wall in which encased steel sections connected to the concrete structure are used as vertical edge reinforcement (see Figure 7.1b);

- Type 3, steel or composite beams are used to couple two or more reinforced concrete or composite walls (see Figure 7.2);

f) Composite steel plate shear walls are those consisting of a vertical steel plate continuous over the height of the building with reinforced concrete encasement on one or both faces of the plate and of the structural steel or composite boundary members.