This educational application supplements, but does not replace, the official AASHTO LRFD Bridge Design Specifications, applicable state DOT manuals, project specifications, and professional engineering judgment.
Graded quiz
Chapter 13 — Bridge Foundations (8 questions)
Chapter 13 — Bridge Foundations (8 questions)
8 questions · PE-exam format · 70% to pass · attempts save to your progress record when signed in.
Work each item to the requested precision. Use the Show clue button only after an honest attempt — hints reveal the AASHTO section and setup, not the answer.
- Q1Meyerhof bearing capacity (cohesionless soil, footing). γ = 120 pcf, D_f = 5 ft, B = 8 ft, φ' = 34°. N_q ≈ 29.4, N_γ ≈ 41.1. Compute q_ult = γ·D_f·N_q + 0.5·γ·B·N_γ (ksf).ksf
- Q2The AASHTO §10.5.5 resistance factor φ for bearing capacity of a spread footing on sand (analytical method) is:
- Q3Driven pile α-method (cohesive). Undrained shear s_u = 1.0 ksf, α = 0.55, perimeter p = 4.2 ft (14-in HP), embedded length L = 40 ft. Compute the side resistance R_s = α·s_u·p·L (kip).kip
- Q4Resistance factor φ for a driven pile with dynamic testing (PDA) per §10.5.5.2.3 is typically:
- Q5O'Neill-Reese drilled shaft in rock. Rock UCS q_u = 5000 psi = 720 ksf, α_E = 0.5. Compute unit side resistance q_s = 0.65·α_E·√(q_u·p_a) with p_a = 2.12 ksf. Report q_s in ksf.ksf
- Q6Group efficiency of a driven friction pile group in cohesive soil (§10.7.3.9) at s = 3d is typically:
- Q7Downdrag on a pile through a 20-ft layer of settling clay. Unit shaft friction (dragload) = 1.0 ksf, perimeter = 4.2 ft. Compute the downdrag force DD (kip).kip
- Q8For a laterally loaded pile using p-y analysis, the input p-y curves depend primarily on:
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