Steel Designers Manual - TheBestFriend.org

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Steel Designers' Manual - 6th Edition (2003)
However, the disadvantages are:
• Increased fabrication for complex framing connections
• Increased site connection work, particularly if connections are welded
• Columns are larger to resist bending moments
• Generally, less stiff than other bracing systems.
Wind-moment frames are limited in application.
Shear walls
Reinforced concrete walls constructed to enclose lift, stair and service cores generally
possess sufficient strength and stiffness to resist the lateral loading.
Cores should be located to avoid eccentricity between the line of action of the
lateral load and the centre of stiffness of the core arrangement. However, the core
locations are not always ideal because they may be irregularly shaped, located at
one end of the building or are too small. In these circumstances, additional braced
bays or continuous frames should be provided at other locations (Fig. 2.30).
Although shear walls have traditionally been constructed in in situ reinforced
concrete they may also be constructed of either precast concrete or brickwork.
additional bracing/rigid
frame required
Fig. 2.30 Core locations: (a) efficient; (b) inefficient
Anatomy of structure 73