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 7 — Prestressed-Concrete Girder Bridges (8 questions)
Chapter 7 — Prestressed-Concrete Girder Bridges (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.
- Q1Elastic shortening loss (pre-tensioned): E_p = 28500 ksi, E_ci = 4300 ksi, f_cgp = 2.1 ksi. Compute Δf_pES = (E_p/E_ci)·f_cgp (ksi).ksi
- Q2The AASHTO §5.9.2.3 service stress limit for tension in precompressed tensile zones of PS members under Service III in moderate corrosion conditions is:
- Q3Total prestress after all losses. Initial jacking f_pj = 0.75·f_pu = 202.5 ksi for f_pu = 270 ksi. Total losses Δf_pT = 40 ksi. Compute f_pe (ksi) and P_e for A_ps = 4.284 in² (kip).kip
- Q4The transfer length of a 0.6-in low-relaxation strand per AASHTO §5.9.4.3.1 is typically taken as:
- Q5Nominal flexural resistance (bonded strand, rectangular): A_ps = 4.28 in², f_ps = 260 ksi, d_p = 68 in, a = 6.0 in. Compute M_n (k-ft).k-ft
- Q6The MCFT shear procedure (§5.7.3.4.2) for PS members requires computation of:
- Q7Anchorage-zone bursting force per §5.9.4.4.1: P_u = 900 kip, a/h = 0.30. Compute T_burst = 0.25·P_u·(1 − a/h) (kip).kip
- Q8Debonding of strands at girder ends is limited (AASHTO §5.9.4.3.3) to:
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