Calculation of a Column of a Multi-storey Frame for Load-bearing Capacity under a Lateral Force

Objective: Check the mode for calculating reinforced concrete structures in the “Reinforced Concrete” postprocessor of SCAD

Task: Check the strength of the column section for the specified reinforcement

References: Guide on designing of concrete and reinforced concrete structures made of heavy-weight concrete (no prestressing) (to SP 52-101-2003), 2005, p. 104-105.

Initial data file:
SCAD 34 SP.spr
report – SCAD 34 SP-2003.doc
report – SCAD 34 SP-2012.doc

 

Compliance with the codes: SP 52-101-2003, SP 63.13330.2012.

Initial data:

Bending moment in the lower support section

b×h = 400×600 mm	Section sizes
а = 50 mm	Distance to the c.o.g. of tensile reinforcement
а/= 50 mm	Distance to the c.o.g. of compressed reinforcement
Asw = 226 mm2 (2Ø12)	Cross-sectional area of tensile reinforcement
sw = 400 mm	Cross-sectional area of compressed reinforcement
l = 3,3 m	Column length
Мinf = 250 kNm
Мsup = 350 kNm	Bending moment in the upper support section
N = 572 kN	Longitudinal compressive force
Concrete class В25
Class of transverse reinforcement А240

 

Results of the SCAD analysis:

N Max. -572 kN Snap 0 m	My Max. -350 kN*m Snap 3,3 m Max. 250 kN*m Snap 0 m	Mz Max. 0 kN*m Snap 0 m Max. 0 kN*m Snap 0 m
Mk Max. 0 kN*m Snap 0 m Max. 0 kN*m Snap 0 m	Qz Max. -181,82 kN Snap 0 m	Qy Max. 0 kN Snap 0 m Max. 0 kN Snap 0 m
	Length of the bar 3,3 m Length of the flexible part 3,3 m Loading L1 - "123"

 

 

Structural group Column

Spacing of transverse reinforcement is greater than the allowable value  (see Sec. 8.3.11 of SP 52-101-2003).
Elements: 1

Importance factor γ_n = 1
Member type - Member under compression and bending (in tension)
Stress state - Uniaxial bending
Maximum percentage of reinforcement 10
Random eccentricity along Z₁ 0 mm
Random eccentricity along Y₁ 0 mm
Structure is statically indeterminate
Effective length factor in the X₁OZ₁ plane 1
Effective length factor in the X₁OY₁ plane 1

Coefficients allowing for seismic action
Normal sections	0
Oblique sections	0

 

Distance to the c.o.g. of reinforcement
a1	a2
mm	mm
50	50

 

Reinforcement	Class	Service factor
Longitudinal	A240	1
Transverse	A240	1

 

Concrete
Concrete type: Heavy-weight
Concrete class: B25

Service factor for concrete
γb1	allowance for the sustained loads	1
γb2	allowance for the failure behavior	1
γb3	allowance for the vertical position during concreting	1
γb4	allowance for the freezing/thawing and negative temperatures	1

Humidity of environmental air - 40-75%

 

Crack resistance
No cracks

Structural group Column. Element No. 1
Member length 3,3 m

Specified reinforcement

Segment	Reinforcement	Section
1	S1 - 2Ø6 S2 - 2Ø6 Transverse reinforcement along the Z axis 2Ø12, spacing of transverse reinforcement 400 mm Transverse reinforcement along the Y axis 2Ø12, spacing of transverse reinforcement 400 mm

 

Results
Segment	Utilization factor	Check	Checked according to SNiP
1	0,98	Strength for an oblique section	Sec. 6.2.34, Sec. 3.52,3.71 of the Guide

 

Comparison of solutions (according to SNiP 52-101-2003):

Check	Strength for an oblique section
Guide	181,8/184,8 = 0,984
SCAD	0,98
Deviation, %	0,4 %