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  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 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 %