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2027 International Building Code
Chapter 18

IBC 2027

2027 International Building Code

Chapter 18Soils And Foundations

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Question 1 1.

Allowable bearing pressures, allowable stresses, and design formulas provided in Chapter 18 must be used in conjunction with which load combinations?

Strength design load combinations of ASCE/SEI 7, Section 2.3
Allowable stress design load combinations of ASCE/SEI 7, Section 2.4
Basic ASD load combinations of IBC Section 1605.1
Factored load combinations of ACI 318 Appendix C

Question 2 2.

Who is required to determine the scope of a geotechnical investigation, including the number and types of borings or soundings and the laboratory testing program?

The building official
A registered design professional
The special inspector
The general contractor

Question 3 3.

Under what circumstance is the registered design professional required to have a fully qualified representative on site during geotechnical exploration?

Only for structures assigned to Seismic Design Category D, E, or F
Only when drilling in rock strata
Only when groundwater is encountered within 5 feet of the surface
During all boring or sampling operations

Question 4 4.

According to ASTM standards referenced in the code, which standard must be used to classify rock during a geotechnical investigation?

ASTM D5878
ASTM D4829
ASTM D4318
ASTM D2487

Question 5 5.

Which of the following test criteria classifies a soil as expansive?

Plasticity index (PI) of 12 or greater
More than 5 percent of soil particles are less than 5 micrometers in size
Expansion index greater than 20 determined in accordance with ASTM D4829
More than 5 percent of soil particles pass a No. 200 sieve

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