Strength Analysis of a Rectangular Section

Objective: Check of the strength analysis of the section

Task: Verify the correctness of the strength analysis of the section

References: Guide on designing of concrete and reinforced concrete structures made of heavy-weight or lightweight concrete (no prestressing) (to SNiP 2.03.01-84), 1989, p. 26.

Initial data file:

Example 3 Guide to SNiP.SAV

report – Arbat 3 SNiP.doc.

Compliance with the codes: SNiP 2.03.01-84*. 

Initial data:

 

b = 200 mm	Beam section sizes
h = 800 mm
а = 50 mm	Distance from the center of gravity of the reinforcement to the compressed edge of the section
As = 2945 mm2 (6Ø25)	Cross-sectional area of reinforcement
Concrete class Class of reinforcement	В25 А-III
М = 550 kNm	Bending moment in the section

ARBAT initial data:

Importance factor  γ_n = 1
Member length 1 m
Effective length factor in the XoY plane 1
Effective length factor in the XoZ plane 1
Random eccentricity along Z according to SNiP 2.03.01-84* (Russia and other CIS countries)
Random eccentricity along Y according to SNiP 2.03.01-84* (Russia and other CIS countries)
Structure is statically determinate
Limit slenderness - 200

Section:

b = 300 mm h = 800 mm a1 = 58.5 mm a2 = 20 mm	S1 - 6Ø25

Reinforcement	Class	Service factor
Longitudinal	A-III	1
Transverse	A-I	1

 

Concrete:

Concrete type: Heavy-weight
Concrete class: B25
Hardening conditions: Natural
Hardening factor 1

Service factor for concrete
γb2	allowance for the sustained loads	0.9
	resulting factor without γb2	1

 

Results for combinations of loadings

	N	My	Qz	Mz	Qy	T	Safety factor for load	Factor for sustained load	Short-term	Seismic
	kN	kN*m	kN	kN*m	kN	kN*m
1	0	550	0	0	0	0	1	1

 

Comparison of solutions:

Check	strength of the section
Guide	550/636,4 = 0,864
ARBAT	0,859
Deviation, %	0,6 %