In: Civil Engineering

The room is 5*6

Steel yield stress (fy = 60000 psi)

Concrete ultimate compressive strength (f’c = 4000 psi)

Reinforced concrete density = 150 lb/ft3.

Normal weight concrete is used.

The slab is treated as a one way slab and subjected to a dead
load of 120 psf (excluding the self-weight

of the slab) and a live load of 220 psf.

- The slab is supported by beams on the edges.

- There is a column at each corner of the slab supporting the
beams.

- Each beam is sitting on a non-load-bearing wall.

Design

- The slab

- The beams

- The columns

Carry out all ACI code checks and sketch your designs.

The compressive strength of concrete is normally distributed
with ? = 2500 psi and ? = 50 psi. Find the probability that a
random sample of n = 10 specimens will have a sample mean diameter
that falls in the interval from 2499 psi to 2610 psi.

A civil engineer is analyzing the compressive strength of
concrete. Compressive strength is approximately Normally
distributed with variance ? 2 = 1000 psi2 . A random sample of ? =
12 specimens has a mean compressive strength of ?̅= 3179.5 psi. Let
? be the true mean compressive strength of all specimens from this
type of concrete. (a) Test ?0: ? = 3200 against ??: ? < 3200 at
? = 0.05. Give the rejection region. (b) If the true...

Using the column interaction diagrams in Appendix A (Concrete
strength = 5 ksi, steel reinforcement yield strength= 60 ksi,) with
longitudinal reinforcement ration of approximately 2%, design
square columns with equal reinforcement on all sides to carry each
of the following loads and select the longitudinal and transverse
reinforcement: 1. Pu = 2000 kips and Mu = 160 ft.kips 2. Pu = 1000
kips and Mu = 220 ft.kips 3. Pu = 500 kips and Mu = 160 ft.kips

Strength of concrete: The compressive strength, in kilopascals,
was measured for concrete blocks from five different batches of
concrete, both three and six after pouring. The data are as
follows. Can you conclude that the mean strength after three days
is less than the mean strength after six days? Let U1 represent the
mean strength after three days and ud=u1-u2, Use the a=0.01 level
and the critical value method with the table.
1. State the appropriate null and alternate hypotheses....

Strength of concrete: The compressive strength, in kilopascals,
was measure for concrete blocks from five different batches of
concrete, both three and six days after pouring. The data are as
follows:
Block
1
2
3
4
5
After 3 days
1341
1316
1352
1355
1327
After 6 days
1376
1373
1366
1384
1358
Can you conclude that the mean
strength after three days differs from the mean strength after six
days? Use the α = 0.05 level of significance.
State...

Use 50,000 psi for the
yield stress of steel, and limit deflection to y max=
span/360.
Factor of safety shall be evaluated based on Yield Stress.
Problem
1. Select the lightest beam to span 40 feet between supports.
There is no load on the beam

Question 6
Young's modulus, yield strength, ultimate tensile strength and
elongation at fracture can ALL be determined by a tensile test.
True
False

Compute the range and sample standard deviation for strength of
the concrete (in psi).
3910,4080,3300,3100,2940,3870,4082,4040.
The range is ___ psi
s= ___ psi (Round to one decimal place as needed).

The accompanying data was obtained in an experiment to
investigate whether compressive strength of concrete cylinders
depends on the type of capping material used (factor A) or
variability in different batches (factor B). Each number is a cell
total (xij.) based on K = 3 observations. Batch 1 2 3 4 5 Capping
Material 1 1844 1941 1934 1888 1799 2 1778 1850 1793 1785 1626 3
1804 1892 1890 1890 1758 In addition, ΣΣΣxijk2 = 16,806,946 and
ΣΣxij.2 =...

Q 1: Design a concrete mix for the following
performances and ingredients:
* Compressive strength at 28 days = 32 MPa, slump 80 mm
* Crushed coarse aggregate of max size 20 mm readily
available
* Fine aggregate is river sand, fineness modulus = 2.5
* Cement Strength Class = 42.5
* Specific gravity of combined aggregate =2.6
* Water absorption of coarse aggregate = 0.8%
* Water absorption of fine aggregate = 0.5%
Q 2: Design a concrete mix...

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