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 γn = 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 %