29 Questions
What are the two types of reinforcing bars mentioned in the text?
Plain Reinforcing Bar and Deformed Reinforcing Bar
What is the color code for Grade 33 reinforcing bars?
White
What is the yield strength of Grade 50 reinforcing bars in MPa?
345 MPa
What is the ultimate strength of Grade 60 reinforcing bars in psi?
60,000 psi
What color code is used for Grade 230 (33) non-weldable deformed bars?
White
What are the welded wire fabric used for?
Pavements or slab-on-grades
What is the American Size No. for rebar used in Girder/Beam/Column?
No. 5
What does the color Yellow represent in ASTM Grade 275 (40) rebar?
ASTM Grade 275 (40)
Why are markings carved on steel bars?
To identify their classifications, strengths, and other details
What are the typical uses of American Size No. 6 rebar?
Girder/Beam/Column
What are the color codes for weldable deformed bars Grade 415 (60)?
Green / Red
What is the design strategy adopted in Limit State Design?
Strength Design
What is the main concern when considering the plastic limit in design?
Development of more cracks and deflection
What does Serviceability in structural design include checking for?
Drifts, deflections, and crack widths
What is another term used for Plastic Design?
Limit design or capacity design
In Balanced Design, when do both the compressive and tensile zones reach yielding?
At the same imposed load on the beam
What are under-reinforced sections in beam design?
Reinforced concrete beam sections in which steel reaches yield strain at loads lower than concrete failure strain
What is the standard size of concrete cylinders used to test compressive strength?
150 mm diameter by 300 mm height (6”x12”) or 100 mm diameter by 200 mm height (4”x8”)
What is the common compressive strength range of concrete typically used?
f’c = 2,500 psi (17 MPa) to f’c > 6,000 psi for high-strength concrete
What is the relationship between flexural strength and compressive strength of concrete?
The flexural strength (fr) is only about 10% to 15% of the compressive strength of concrete (0.10f’c – 0.15f’c).
What is another name for the Modulus of Rupture in concrete?
Flexural strength (fr)
How are beam samples typically used to test flexural strength?
6”x6”x20” beam samples are used to test flexural strength.
What type of concrete is characterized by a compressive strength greater than 6,000 psi?
High-strength concrete
What must an engineer consider when designing structures?
All loads that might act simultaneously on the structure
What is the purpose of load combinations in structural design?
To ensure the structure has adequate strength to resist the most unfavorable load combinations
Besides strength requirements, what other requirements must a structure satisfy?
Serviceability requirements related to its intended use
What are some examples of serviceability requirements for structures?
Deflections, vibrations, cracking, corrosion, and fatigue
What are the commonly used load combinations in the design of structures according to NSCP 2001?
PU = 1.40 PDL + 1.70 PLL, MU = 1.40 MDL + 1.70 MLL
What are the commonly used load combinations in the design of structures according to NSCP 2010/2015?
PU = 1.20 PDL + 1.60 PLL, MU = 1.20 MDL + 1.60 MLL
Test your knowledge on the compressive strength of concrete (f'c) by answering questions related to standard cylinder sizes, curing conditions, loading process, and testing duration at 28 days.
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