Question

If not specified in the question, use

f MPa c



 28

and

f

y

 420MPa

]

]

Q1) Select the correct answer among the given choices showing your brief solution.

(Answer only five points) [15 Marks]

1- For a concrete with

f

c



 25MPa

and a unit weight of 1800 kg/m3

, the modulus of elasticity is

approximately………MPa.

(a) 45000 (b) 18000 (c) 23500 (d) 16400 (e) None

2- For a beam with an effective depth to compression zone depth ratio of 2.6, the bending reduction factor

equals approximately

(a) 0.83 (b) 0.85 (c) 0.86 (d) 0.9 (e) None

3- A cantilever beam with a span of 2.5 m is loaded with wu= 60 kN/m. If b=300 mm and d=500 mm, then

the stirrups can be discontinued at a distance of …….. mm from the face of support.

(d) 500 (b) 813 (c) 1660 (d) 2000 (e) None

4- If a spirally light weight column is reinforced with 6 Φ16, then the minimum development length of the

bars equal………..mm. Use

f

y

 350MPa

and

f

c



 60MPa

(a) 174 (b) 181 (c) 208 (d) 217 (e) None

5- A beam is reinforced with Ø16 mm bars and Ø10@200 mm stirrups. If the concrete cover is 40 mm,

f

y

 420MPa

and

f

c



 25MPa

, then the development length of the 180o

hooks of the reinforcing bars is

………….mm.

(a) 573 (b) 323 (c) 269 (d) 430 (e) None

6- For a simply supported beam with b=300 mm and d=500 mm, if

fc



 63MPa , f

y

 280MPa

and the net

tensile strain is greater than 0.005, then the maximum steel ratio equals..........

(a) 0.0406 (b) 0.0310 (c) 0.0287 (d) 0.0180 (e) None

7- A 6 m span simply supported inverted T-beam is loaded with wu= 40 kN/m on the top faces of the

inverted flange. If the effective depth of the beam is d = 500 mm, then Vu at the critical section is .......... kN.

(a) 240 (b) 120 (c) 100 (d) 220 (e) None​

Answer 1

Answer:

174

0.0 nonstop

konjiw

nuensjusuhesi,wow

Explanation:

sex