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 γn = 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 %