CIVI 390
Estimation of Earthquake loads
Effect of building configuration on Seismic design
Large concentrated
masses or abrupt
changes in mass,
stiffness, or strength
from storey to storey
Large eccentricities
CIVI 390
Fall 2013
1
Low torsional stiffne

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CIVI 390
CIVI 390 Wind Load
(Section 4.1.7 and Commentary I of NBCC)
Wind Load
Wind Load is a variable load and must be accounted for
in the design of buildings and other structures.
Both the geometry and size of the structure affect the
magnitude of th

CIVI 390 Loads in Buildings
CIVI 390
1
Limit States Design
Limit state- limiting the state of the structure for which it is
designed
Major limit states:
(1) ULS those limit states concerning safety, this includes
exceeding the load carrying capacity; frac

Example on Earthquake loading Dr. Anjan Bhowmick
A 4-storey ofce building is 45m X 45m in plan. The E0 loads are resisted by ductile
moment resisting frames located on four sides of the building. Assume the building is in
Vancouver. Calculate the earthqua

Notional load
Note: Clause 8.7.2 of S16-09 requires that
notional lateral loads (loads that are not
physically applied to the structure) be
applied at each storey.
This notional load is taken as 0.005 times
the factored gravity loads contributed by the
st

DESIGN OF CONCENTRIC BRACED FRAME
Sample Example:
3@4000 mm
Design the Bracings, Beam at the third oor and column at the rst oor for the Moderately
Ductile Concentric Braced Frame. The lateral forces shown are (EQ loads + Notional loads).
Consider 9 k

Load Calculations for
Beams and Columns of a
typical 4-storey Steel
Building
A1B1
FB1
B2C2
Design Aids
Floor beams (secondary beams) are so arranged that they act as
simply supported beams and rest on main beams
Columns in simple construction should be