Design of sections for hidden beamsName of project bm

Type of project 2 Office building

Type of floor 1 Floor

Floor number الــدور Number of spans 2 One Spans

Place of beam 1 Edge beam

a - Specification of spansSpan number 1 2 3 4 5 6 7

Length 8

b - Type of loads on beams1 - Uniform load

Span number 1 2 3 4 5 6 7

Load 6.7

2 - Concentrated load

Span number1 2 3 4 5 6 7

P(t) X(m) P(t) X(m) P(t) X(m) P(t) X(m) P(t) X(m) P(t) X(m) P(t) X(m)

Concentrated load ( 1 )

Concentrated load ( 2 )

Concentrated load ( 3 )

c - Exact moments1 - Positive moment

Span number 1 2 3 4 5 6 7

Positive moment ( m.t ) 53.6 0 0 0 0 0 0

2 - Negative moment

Place of moment bet. ( 1 - 2 ) bet. ( 2 - 3 ) bet. ( 3 - 4 ) bet. ( 4 - 5 ) bet. ( 5 - 6 ) bet. ( 6 - 7 )

Negative moment ( m.t ) 0 0 0 0 0 0

d - Design of sections 1 - Rectangular sections due to negative moment NO- of support 1 2 3 4 5 6 7 8

Assume total depth of beams( t ) 37 cm Reaction( t ) 26.80 26.80 0 0.00 0.00 0.00 0.00 0.00

Assume breadth of beams( b ) 210 cm

f s ( kg / cm2 ) 1800 fc allowable 85 K1 0.255

C 28 ( kg / cm2 ) 225 K2 1552

الشكور / عبد ابراهيم م تصميم

kg/cm2

000000000000

-53.6

00000000000

-26.8

0

26.8

S.F Diagram

B.M Diagram

ts (cm ) 12

Design of sections for hidden beamsName of project bm

Type of project 2 Office building

0 F 0 /m 4 F 0 0 F 0

Max. negative moment 0 m.t

Then : - cm

K1 0 fc 0 0

K2 0 From positive moment 0 cm

From positive moment Area of reinforcement ( As ) 0 0 F 0 Area of chosen reinf. 0.00 cm OK

OR

0 F 0

+ Area of chosen reinf. 0.00 cm OK

0 F 0

Place of moment bet. ( 1 - 2 ) bet. ( 2 - 3 ) bet. ( 3 - 4 ) bet. ( 4 - 5 ) bet. ( 5 - 6 ) bet. ( 6 - 7 )

Area of reinforcment 0 0 0 0 0 0

n F n F n F n F n F n F

Reinf. 0 0 0 0 0 0 0 0 0 0 0 0

Another reinf.

OR OR OR OR OR OR

0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0

2 - Rectangular sections due to positive moment

f s ( kg / cm2 ) 1800 fc allowable 85 K1 0.255

C 28 ( kg / cm2 ) 225 K2 1552

Max. positive moment 53.6 m.t 7 F 10 /m 22 F 25 21 F 16

Then : -

K1 0.207 fc 90 cm

K2 1543 Unsafe 37

The section is unsafe change the depth or breadth 210 cm

Area of reinforcement ( As ) 105 22 F 25 Area of chosen reinf. ### cm OK

OR11 F 25

+ Area of chosen reinf. ### cm OK

11 F 25

As minimum ( cm2 ) 20.79 5 F 25 Take actual reinf.

Span number 1 2 3 4 5 6 7

Area of reinforcment 105.3 0 0 0 0 0 0

n F n F n F n F n F n F n F

Reinf. 22 25 0 0 0 0 0 0 0 0 0 0 0 0

Another reinf. OR OR OR OR OR OR OR

11 25 0 0 0 0 0 0 0 0 0 0 0 0

11 25 0 0 0 0 0 0 0 0 0 0 0 0

3 - StirrupsNumber of stirrups 7

diameter of stirrups 10

Number of stirrups 10

kg/cm2

cm2

kg/cm2

kg/cm2

cm2

cm2

7 F 10 / m ( أفرع ( عشرة