Glossary

The maximum pressure soil can support without shear failure.

Equations: qult = c·Nc + q·Nq + 0.5·γ·B·Nγ

Lecture: Shallow foundations

Standards: AASHTO LRFD

Sudden lateral instability of a compression member before the material reaches its yield stress.

Equations: Pcr = π²EI / (KL)²

Lecture: Compression member behavior

Standards: AISC 360

Ratio of resisting capacity to applied demand in allowable-stress checks.

Equations: FS = Resisting / Driving

Lecture: Design philosophy

Standards: —

Bending action producing tension on one face and compression on the other.

Equations: σ = Mc/I · Mn = As·fy·(d − a/2)

Lecture: Beam design

Standards: AISC 360, ACI 318

Vertical distance between the design water surface and the top of a structure.

Equations: Freeboard = Ztop − WSEdesign

Lecture: Open channel design

Standards: USACE EM 1110

A plot of discharge versus time at a point in a watershed.

Equations: Qp from unit hydrograph convolution

Lecture: Rainfall-runoff

Standards: NRCS TR-55

The rotational effect of a force about a point or axis.

Equations: M = F·d

Lecture: Statics fundamentals

Standards: —

A region where a member has fully yielded and rotates at nearly constant moment.

Equations: Mp = Fy·Z

Lecture: Inelastic behavior

Standards: AISC 360

Precipitation that flows over the surface rather than infiltrating.

Equations: Q = C·i·A

Lecture: Hydrology basics

Standards: State drainage manual

Reduction in a member's cross-sectional area caused by corrosion or damage.

Equations: Aeff = Agross − Aloss

Lecture: Condition assessment

Standards: FHWA NBIS

Performance under service loads: deflection, vibration, cracking, and comfort.

Equations: Δ ≤ L/360

Lecture: Limit states

Standards: ASCE 7, AISC 360

Downward movement of a foundation from soil compression.

Equations: Sc = (Cc·H/(1+e0))·log10((σ'0+Δσ)/σ'0)

Lecture: Consolidation

Standards: ASTM D2435

Internal force acting parallel to a cross-section.

Equations: τ = VQ / (I·b)

Lecture: Beam internal forces

Standards: AISC 360, ACI 318

The number of vehicles passing a point over a stated time period.

Equations: PHF = V / (4·V15)

Lecture: Traffic operations

Standards: HCM

The maximum stress a material sustains before fracture.

Equations: σu = Pmax / A0

Lecture: Material behavior

Standards: ASTM E8

Onset of permanent plastic deformation when stress reaches the yield strength.

Equations: σ = Fy

Lecture: Material behavior

Standards: ASTM A992