Selection of beam reinforcement

Objective: Selection of beam reinforcement

Task: Select area of the longitudinal reinforcement

References: Bliharsky Z.Y. Calculation and construction of bending reinforced concrete elements: Educational Guide / Z.Y. Bliharsky, I.I. Karhut. – Lviv: Lviv Polytechnic Publisher, 2017. – 188 p. (Example 4.3, p. 50-51)

 

Initial data file:

ARBAT mode – Selection of section reinforcement

Example-4.3-DBN.SAV
report – Arbat 4.3-DBN.doc.

Compliance with the codes: DBN V 2.6-98:2009, DSTU B.V 2.6-156:2010

Initial data:

b×h = 200×700 mm	Cross-section sizes
а = 30 mm	Distance to the center of gravity of reinforcement
М= 475 кНм	Bending moment
Concrete class Class of reinforcement	С30/35 A500С

 

Initial data in ARBAT:
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 DBN B.2.6-98:2009 with modification No.1

Random eccentricity along Y according to DBN B.2.6-98:2009 with modification No.1

The structure is statically determinate

 

 

Section

b = 300 mm h = 700 mm a1 = 40 mm a2 = 40 mm

 

Reinforcement	Class	Additional service factor
Longitudinal	A500C	1
Transverse	A240C	1

 

Concrete

Concrete type: Heavy-weight

Concrete class: C20/25

Aggregate: Quartzite

 

Additional parameters
Additional service factor	1
Age of concrete (days)	28
Cement strength class	Class R
Creep development time	36500	days
Temperature T(Δt)	20	°C
Number of days when the temperature T prevails Δt	28	days
Relative humidity	40	%

 

	N	My	Qz	Mz	Qy	T	Factor for sustained load	Short-term	Seismicity	Special
	kN	kN*m	kN	kN*m	kN	kN*m
1	0	475	0	0	0	0	1

 

Results of the reinforcement selection

 

Type	Asymmetric reinforcement		Symmetric reinforcement
	AS1	%	AS1	%
	cm2		cm2
total	18,652	0,942	17,791	1,797

 

Comparison of solutions

Check	Selected reinforcement
Guide	1941,7 mm2
ARBAT	1865,2 mm2
Deviation, %	4,1 %