STRUCTURAL / COLUMNS4 min read
What does an Euler column check assume?
Effective length, flexural stiffness, and weak-axis slenderness make ideal elastic instability visible before a full code check.
Read the field notereference / field notes
The context around the number.
Short notes for understanding the load case, geometry, units, and practical judgement behind a quick engineering result.
STRUCTURAL / REINFORCED CONCRETE5 min read
How do you estimate required RC beam steel?
An inverse stress-block equation estimates theoretical tension-steel area before code checks and a constructible bar arrangement.
Read the field noteSTRUCTURAL / REINFORCED CONCRETE5 min read
How do you estimate RC beam flexural capacity?
A visible tension force, compression block, and factor basis make a preliminary reinforced-concrete capacity screen easier to audit.
Read the field noteSTRUCTURAL5 min read
What does a beam quick check actually tell you?
Moment, shear, and elastic deflection answer different questions. Keep the screening result separate from a complete member design.
Read the field noteSTRUCTURAL / BEAMS4 min read
How do off-centre beam loads change the reactions?
A point load away from midspan shifts the support reactions and the location of the governing bending moment.
Read the field noteSTRUCTURAL / FLEXURE4 min read
What does an elastic bending-stress screen leave out?
M/Z makes the stress transparent, but stability, shear, connections, and code resistance still need separate checks.
Read the field noteSTRUCTURAL / GEOMETRY3 min read
What changes when the section is circular?
A solid circle has the same centroidal properties about any diameter, but its diameter-to-property relationship is different from a rectangle.
Read the field noteSTRUCTURAL / GEOMETRY4 min read
Why do I-sections have different strong and weak axes?
Flange width and overall depth distribute area very differently about the two centroidal axes, so Ix, Iy, Zx, and Zy must stay paired with the correct direction.
Read the field noteSTRUCTURAL / GEOMETRY4 min read
What do T-section properties tell you?
The flange shifts the centroid, so top and bottom section moduli differ even when the web is centred.
Read the field noteSTRUCTURAL / GEOMETRY4 min read
What do L-section properties tell you?
An angle section’s centroid is away from the outer corner, with different extreme-fibre moduli in both directions.
Read the field noteMATERIALS3 min read
Concrete order quantities: where does the allowance go?
Separate geometric volume from the quantity you order, then record the allowance so the decision is easy to audit.
Read the field noteUNITS2 min read
Keep the unit system consistent before you calculate.
A quick conversion before a formula is cheaper than debugging a result after the fact.
Read the field noteHYDRAULICS4 min read
What does a Manning open-channel check assume?
Rectangular geometry, roughness, slope, and uniform flow are useful first-pass inputs—but not the whole water problem.
Read the field noteHYDRAULICS / OPEN CHANNELS4 min read
What does rectangular-channel critical depth mean?
Critical depth is the minimum-specific-energy state for a discharge and width; it is not the same as Manning normal depth.
Read the field noteHYDRAULICS / FLOW CONTROL4 min read
What does a rectangular weir-flow screen assume?
Free-flow discharge depends strongly on the upstream head, crest width, and coefficient selected for the physical weir.
Read the field noteHYDRAULICS5 min read
How do you solve for Manning normal depth?
A target discharge can be converted into a rectangular-channel depth by iterating the Manning relationship, then checking velocity and flow regime.
Read the field noteHYDRAULICS / CLOSED CONDUITS4 min read
How do you size a full-flow pipe with Manning?
The inverse full-pipe relationship turns target flow, slope, and roughness into an internal diameter estimate before commercial-size and partial-flow checks.
Read the field noteHYDRAULICS4 min read
What does a trapezoidal Manning check assume?
Side slopes change area, wetted perimeter, and hydraulic radius; freeboard and non-uniform flow still need checking.
Read the field noteHYDRAULICS4 min read
What does a full-pipe Manning capacity assume?
Full circular geometry gives a quick capacity estimate, but partial flow, inlet control, tailwater, and head losses still need checking.
Read the field noteHYDRAULICS5 min read
Why does pipe depth change the Manning result?
Partial flow changes area, wetted perimeter, hydraulic radius, and capacity; a full-pipe shortcut is not valid at every depth.
Read the field noteHYDROSTATICS4 min read
Where does hydrostatic wall thrust act?
A triangular pressure diagram gives a base pressure, a resultant thrust, and a centre of pressure at one-third of the water depth.
Read the field noteHYDRAULICS / CLOSED CONDUITS5 min read
What does Darcy-Weisbach head loss tell you?
Full-pipe friction and local losses convert velocity, resistance, and fitting assumptions into an energy-loss estimate.
Read the field noteHYDRAULICS / CLOSED CONDUITS5 min read
What does Hazen-Williams head loss tell you?
Flow, diameter, pipe length, and the selected C value frame a transparent water-pipe friction estimate.
Read the field noteFOUNDATIONS4 min read
What does an average footing-pressure check assume?
A concentric pressure comparison is a starting point. Keep eccentricity, settlement, soil source, and structural checks visible.
Read the field noteFOUNDATIONS5 min read
What does a Terzaghi bearing-capacity screen show?
Separate cohesion, overburden, and soil-wedge terms before comparing gross applied pressure with a preliminary allowable value.
Read the field noteRETAINING WALLS5 min read
What does a Rankine active-pressure screen assume?
Dry level backfill and mobilised wall movement make a transparent first pass, not a complete retaining-wall stability design.
Read the field noteRETAINING WALLS5 min read
What does a simple wall stability screen compare?
Overturning, sliding, resultant location, and linear base pressure provide a first pass before the full wall and foundation design.
Read the field noteLOAD TAKE-OFF4 min read
What does a slab load take-off assume?
Area loads become beam line loads through tributary width, but the load source and distribution assumption still need checking.
Read the field noteREINFORCEMENT4 min read
How does rebar spacing change quantity?
Clear strip width and maximum spacing determine the bar count, while cut length and bar diameter frame an order estimate.
Read the field noteEARTHWORK4 min read
What does an average-end-area earthwork check assume?
Two cross-sections can frame a quantity, but survey basis, material state, and planning adjustments must remain visible.
Read the field noteSITE / GRADES3 min read
What does a grade-and-slope conversion assume?
Rise, run, angle, and ratio describe the same straight geometry, but a project still needs its own drainage, access, and stability limits.
Read the field noteSTORMWATER4 min read
What does a Rational Method peak flow assume?
Runoff coefficient, design intensity, and catchment area frame a peak flow—but not routing, storage, or inlet design.
Read the field noteCOLUMNS4 min read
What does a gross column stress screen leave out?
Average axial stress is a starting point; slenderness, eccentricity, reinforcement, and code resistance still need separate checks.
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