a) Is the beam properly reinforced/over-reinforced/ balanced Determine the factored moment resistance? b) Consider the beam section "a) "above. However, due to embedded items, the reinforcing is raised by 65 mm, such that the effective depth is reduced to 585 mm (Draw the new cross-section view). Find the factored moment resistance considering the new reinforcement layout. c) Comment on the effect of the change in reinforcement location on the moment resistance d) Refer to the beam section from Part "b" above. The same contractor reported that, due to some problems related to batching, the actual 28-day concrete strength is reduced by 10%. What is the new F'.? Find the factored moment resistance for the new strength. e) What do you believe has a more substantial influence on the magnitude of the factored moment resistance: a 10% decrease in the concrete strength (as solved in part "d)") or placement of reinforcement resulting in a 10% decrease in the effective

a) Is the beam properly reinforced/over-reinforced/ balanced Determine the factored moment resistance? b) Consider the beam section "a) "above. However, due to embedded items, the reinforcing is raised by 65 mm, such that the effective depth is reduced to 585 mm (Draw the new cross-section view). Find the factored moment resistance considering the new reinforcement layout. c) Comment on the effect of the change in reinforcement location on the moment resistance d) Refer to the beam section from Part "b" above. The same contractor reported that, due to some problems related to batching, the actual 28-day concrete strength is reduced by 10%. What is the new F'.? Find the factored moment resistance for the new strength. e) What do you believe has a more substantial influence on the magnitude of the factored moment resistance: a 10% decrease in the concrete strength (as solved in part "d)") or placement of reinforcement resulting in a 10% decrease in the effective

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

100%

2/3
700 mm
1) A typical cross-section of a properly reinforced con-crete beam is shown in the figure below. The
material properties are summarized below. Use an effective depth of 600 mm.
500 mm
Given:
fy = 400 MPa
= 0.65
75%
= 0.85
E = 200 000 MPa
Y
See the
Table 1
f' 48MPa - Bar : 3-30M
a) Is the beam properly reinforced/over-reinforced/ balanced Determine the factored
moment resistance?
b) Consider the beam section "a) "above. However, due to embedded items, the
reinforcing is raised by 65 mm, such that the effective depth is reduced to 585 mm
(Draw the new cross-section view). Find the factored moment resistance considering
the new reinforcement layout.
c) Comment on the effect of the change in reinforcement location on the moment
resistance
d) Refer to the beam section from Part "b" above. The same contractor reported that,
due to some problems related to batching, the actual 28-day concrete strength is
reduced by 10%. What is the new F'c? Find the factored moment resistance for the
new strength.
e) What do you believe has a more substantial influence on the magnitude of the
factored moment resistance: a 10% decrease in the concrete strength (as solved in
part "d)") or placement of reinforcement resulting in a 10% decrease in the effective
depth (as solved in part "b)"). Why?

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Step 1 Given

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Step 2 Evaluating the basic stress parameters

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Step 3 Classification of section

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Step 4 Effective depth has changed to d = 585 mm

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Step 5 Nominal moment capacity of beam with changed effective depth

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Step 6 Nominal moment capacity of beam with original effective depth

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Step 7 Reduction of compressive strength

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Step 8 Comments on result

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