In: Civil Engineering

The service load bending moments on a beam are 128 kip-ft for dead load and 107 kip-ft for live load. The beam is 12 in. wide, f’c is 3000 psi and fy is 60 ksi. Determine Mu, Mt, p, R, the depth of the beam and the As of tensile reinforcing required. How many no. 8 bars or No. 10 bars would have the required As?

important notes

Recent version of ACI 318 only specify minimum and maximum rebar ratio . The design have to choose a steel ratio based on his experience ,for a target steel strain value in rebar or based on recomended formula by older version of ACI 318. Once rebar ratio is choosed d ,As value changes accrodingly.

if this question is multilpe choice question you have to be specific in selecting rebar ratio. pleses provide the rule you are following while selecting rebar ratio. i will work for that .

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A beam is subjected to equal bending moments M = 6.5 kip-ft, as
shown. The cross-section of the beam is also shown. The top
rectangular area (1) has cross-section dimensions b1 x d1, as
shown, where b1 = 6.5 in. and d1 =1.50 in. The left and right
rectangular legs (2) and (3) are of dimensions b2 x d2 as shown,
where b2=0.75 in. and d2=6.0 in. Determine: (a) the centroid
location, the moment of inertia about the z axis,...

For bending only, determine the lightest-weight W-shape
to carry a uniform dead load of 4.5 kip/ft plus the
beam self-weight and a live load of 3.5 kip/ft on a simple
span of 24 ft. Consider only the limit state of yielding and
use A992 steel. Design by (a) LRFD

Select a 12 ft cantilever beam with p = 0.012, to
support a dead load of 2k/f (including self weight) and Live load
of 3 k/ft. fy= 60000 psi, fc'= 3500 psi (hint your answer should be
Width = XXXX, Effective depth= XXXXX, Area of reinforcement =
XXXXX)

Design for flexure a beam 12 ft in length, having a uniformly
distributed dead load of 1 kip/ft, a uniformly distributed live
load of 1 kip/ft, and a concentrated dead load of 8.4 kips a
distance of 5 ft from one support Show all the steps. (LRFD) Fy =
50k/in2 E = 29,000k/in2

A Simply supported rectangular, tension-reinforced beam is to be
designed for dead load of 0.75 k/ft plus self weight and service
live load of 2.0 k/ft, with a 30 -ft simple span. Material strength
will be fy = 60 ksi and fc = 5 ksi for steel and normal weight
concrete respectively.
Start the design of the beam dimensions using the rules of
thumbs in class. The total beam depth, h, must not exceed twice the
width.
Calculate the required...

A Simply supported rectangular, tension-reinforced beam is to be
designed for dead load of 0.75 k/ft plus self weight and service
live load of 2.0 k/ft, with a 30 -ft simple span. Material strength
will be fy = 60 ksi and fc = 5 ksi for steel and
normal weight oncrete respectively.
Startthe design of the beam dimensions using the rules of thumbs
in class. The total beam depth, h, must not exceed twice
the width.
Calculate the required beam...

A simply supported beam spans 35ft and carries a simply
distrusted dead load of 0.2kip/ft including the beam self-weight
and live load of 0.8kip/ft. Determine the minimum required plastic
section modulus and select the lightest-weight W-shape to carry the
moment. Assume full lateral support and A992 steel. Design by (a)
LRFD and (b) ASD

Select the lightest W section to support a uniform distributed
load WD=0.5 kip/ft,
W=1.4 kip/ft in addition to the section self
weight. The element will be simple
supported with a span of 24 ft. Use A36 (Deflection does not
require to be verified).

Design a 9 ft cantilever if a dead load 1 k / ft ( not
including the beam weight ) and live load of 1 k / ft . use fc ' =
3800 psi and fy = 60,000 psi . ( Hint : Rectangular section ,
answer should be in In " 2 for Area of steel and in inches for
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A simply supported beam is required to carry a moment of 50
kip-ft across a 25' span. Assuming that 4 and 8 ksi concrete are
available, with a cost difference of 30 percent. Use 60 ksi steel.
Beam width is fixed at 12 inches. You can Vary h.
a)design the beam using 2 different concretes - dont forget beta
is different.

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