DESIGN OF BEAMS By: Engr. Dr. Thevaneyan Krishta David Faculty of Civil Engineering Universiti Teknologi MARA (UiTM), SHAH ALAM
At the end of this week student should be able to: a)
Adapt the procedure in the EC2 to design the beam(CO2).
b)
Adopt new parameter to design the beam(CO2).
c)
Construct the detail of beam.(CO2)
CONTINUOUS BEAM
Load cases & combinations Variables actions can usually cover all or any span of a continuous beam. Therefore a continuous beam should be analyzed for the loading arrangements which give the maximum stresses at each section.
EN 1992-1-1: Sec. 5.1.3 Load set 1: Alternate or adjacent spans loaded ď ąalternate span carrying the design variable and permanent load (1.35Qk + 1.5Gk), other spans carrying only the design permanent loads (1.35Gk)
ď ąany two adjacent spans carrying the design variable and permanent loads (1.35Qk + 1.5Gk), all other spans carrying only the design permanent load (1.35Gk)
Adjacent span loaded Alternate spans loaded
UK NATIONAL ANNEX Load set 2: All or alternate spans loaded ď ąall span carrying the design variable and permanent loads (1.35Qk + 1.5Gk)
ď ąalternate span carrying the design variable and permanent load (1.35Qk + 1.5Gk), other spans carrying only the design permanent loads (1.35Gk)
Continuous Beams: Flanged Section Generally, FLANGED section (i.e. T-beam and L-
beam) are encountered in beams supporting slab which acts integrally with the beam in longitudinal direction of the beam The slab portion is called the flange and the beam
blow the flange is termed web In flanged section, the effective width need to be
defined Cl. 5.3.2.1 EC2 specified the effective flange width
beff as following:
Continuous Beams: Flanged Section Cl. 5.3.2.1 EC2 specified the effective flange width
beff as following: beff = bw + beff,i
b
Where
beff,i = 0.2bi + 0.1lo ≤ 0.2lo and beff,i ≤ bi
Design Procedure: Flanged Section
Design Procedure: Flanged Section
To be continued