Memory AnchorsCELE · Reinforced & Prestressed ConcreteReal content

CELE Reinforced & Prestressed Concrete — Reinforced Concrete SlabsMemory Anchors

Summary Concepts Notes Revision Deep Dive Slides Flashcards Mistakes Cheat Mnemonics Templates

If you keep missing Reinforced Concrete Slabs items on your CELE mocks despite having read the notes, the gap is usually recall speed. Memory anchors close that gap. These Reinforced Concrete Slabs mnemonics have been tuned to the kinds of triggers Professional Regulation Commission (PRC) — Board of Civil Engineering builds into CELE Reinforced & Prestressed Concrete questions.

Exam context

For the Civil Engineer Licensure Examination, Professional Regulation Commission (PRC) — Board of Civil Engineering tests Reinforced & Prestressed Concrete under a "Core" label, with Reinforced Concrete Slabs in the 5th slot across 7 chapters. CELE candidates must clear the 70% weighted average, no sub-test below 50% cut on the 2026 paper, which draws about a meaningful share of Reinforced & Prestressed Concrete questions. Date to watch: May and November 2026.

Reinforced Concrete Slabs - Memory Anchors

Memory techniques can transform abstract engineering formulas into vivid mental images that stick for years. Research in cognitive psychology shows that attaching new information to emotionally charged stories, familiar analogies, or rhythmic phrases increases long-term recall by up to 600% compared to rote repetition. For the PRC Civil Engineer Licensure Examination, where you must recall dozens of NSCP provisions under time pressure, a strong memory anchor means the difference between a confident answer and a blank mind. This collection uses mnemonics, micro-stories, analogies, and visual maps to lock every key concept of RC Slabs into long-term memory. Use each anchor as a mental shortcut — when you see a slab problem on the board exam, your brain fires the trigger phrase, and the formula or rule appears automatically.

Anchors

Topic

One-Way vs Two-Way Classification

Concept

Classification: one-way slab when Llong/Lshort ≥ 2

Anchor Id

Difficulty

easy

Memory Aid

Imagine a JEEPNEY riding on a long, narrow road. The jeepney (load) only bends the road in ONE direction — along the short width — because the road is too long in the other direction to matter. If the road is nearly square (like a basketball court), the jeepney causes the floor to sag in BOTH directions. The magic cutoff: when the long side is at least TWICE the short side, it's a one-way road for the load.

Anchor Type

analogy

Why It Works

The jeepney-road analogy maps directly to the structural behavior: loads travel to the nearest supports (short span), and the ratio-of-2 cutoff becomes the 'too-long-to-matter' threshold — a concept every Filipino student immediately visualizes.

Example Usage

Exam question: A slab panel is 3 m × 7 m. One-way or two-way? Trigger: Is it like a jeepney road? 7/3 = 2.33 ≥ 2 → ONE-WAY slab.

Recall Trigger

Jeepney on a long narrow road → ONE way

Topic

One-Way vs Two-Way Classification

Concept

Classification: two-way slab when Llong/Lshort < 2

Anchor Id

Difficulty

easy

Memory Aid

Picture a square BANGKETA (sidewalk tile) — it is nearly square, so when you step on it, it flexes in all four directions equally. That tile is a TWO-WAY slab. Now stretch it until it is more than twice as long as it is wide — it becomes a plank, and a plank bends only one way. Visual rule: if it looks 'roughly square' (ratio < 2), it bends TWO ways.

Anchor Type

visual_association

Why It Works

The square tile vs. plank visual contrast is immediate and physical. Students who have stepped on loose sidewalk tiles already have the sensory memory of two-way flexure.

Example Usage

Panel 6 m × 7 m: 7/6 = 1.17 < 2 → looks like a wide tile → TWO-WAY.

Recall Trigger

Square bangketa tile → TWO-WAY

Topic

Minimum Thickness for Deflection Control

Concept

Minimum thickness for simply supported one-way slab: h = L/20

Anchor Id

Difficulty

easy

Memory Aid

Remember the phrase: 'SIMPLY 20, ONE-END 24, BOTH-ENDS 28, CANTILEVER 10.' Make it a chant: 'SS-20, OE-24, BE-28, CANT-10.' The numbers INCREASE as support increases (more support = thinner allowed), EXCEPT the cantilever which is the stiffest design so the THICKEST minimum.

Anchor Type

mnemonic

Why It Works

The ordered chant (20, 24, 28, 10) uses rhythmic chunking. The logical pattern (more support → larger denominator → thinner slab) gives a reason behind the numbers, which activates deeper encoding.

Example Usage

Simply supported slab, L = 4 m: SS → L/20 = 4000/20 = 200 mm minimum.

Recall Trigger

Chant: SS-20, OE-24, BE-28, CANT-10

Topic

Minimum Thickness for Deflection Control

Concept

Minimum thickness for cantilever slab: h = L/10

Anchor Id

Difficulty

easy

Memory Aid

Engineer Ana designs a cantilevered balcony at a condo in BGC. Her supervisor shouts: 'Ana, a cantilever has NO back support — make it THICK!' Ana remembers: the denominator is the SMALLEST (10), meaning the slab is the THICKEST. She pictures the number 10 as two legs — the cantilever needs TWO strong legs (thick slab) to stand alone.

Anchor Type

micro_story

Why It Works

The story creates an emotional memory (supervisor shouting) plus a visual pun (10 = two legs). The 'smallest denominator = thickest slab' logic is embedded in the narrative.

Example Usage

Cantilever slab, L = 2.5 m: L/10 = 2500/10 = 250 mm minimum.

Recall Trigger

Cantilevered balcony → Ana's supervisor → 'MAKE IT THICK' → L/10

Topic

Minimum Thickness for Deflection Control

Concept

fy correction factor for minimum thickness: multiply by (0.4 + fy/700)

Anchor Id

Difficulty

medium

Memory Aid

Use the phrase: 'POINT FOUR plus FY over SEVEN HUNDRED.' Shortcut: 'p4 + fy/7h.' At fy = 420 MPa: 0.4 + 420/700 = 0.4 + 0.6 = 1.0 — so the formula gives EXACTLY the table value! That makes fy = 420 the 'reference grade.' For fy = 415: 0.4 + 415/700 = 0.993 ≈ nearly 1.0. For fy = 275 (lower grade): 0.4 + 275/700 = 0.793 — a THINNER slab is acceptable because lower-strength steel is more flexible (needs less thickness for the same stiffness behavior). Wait — actually lower fy gives a smaller multiplier meaning a THINNER minimum, which is counterintuitive! Remember: 'Lower fy, lower factor, lower minimum.' The code allows it because the slab deflects more gracefully with lower-strength steel at smaller strains.

Anchor Type

mnemonic

Why It Works

Anchoring to the fact that fy = 420 gives factor = 1.0 provides a self-checking reference point. Students can verify their formula recall by plugging in 420 and confirming they get 1.0.

Example Usage

fy = 275, simply supported, L = 4 m: h = (4000/20)(0.4 + 275/700) = 200 × 0.793 = 158.6 mm → use 160 mm.

Recall Trigger

fy = 420 → factor = 1.0 (reference check)

Topic

Flexural Design per Metre Strip

Concept

Slab design as a 1 m wide beam strip

Anchor Id

Difficulty

easy

Memory Aid

Think of slicing a slab like cutting a loaf of TASTY bread into 1 cm slices. Each slice is a beam. For slabs, you slice perpendicular to the span direction and take a slice exactly 1000 mm (1 m) wide. That slice IS a rectangular beam with b = 1000 mm. You design that one slice, then repeat it across the whole slab. Every formula you know for beams applies directly — just use b = 1000.

Anchor Type

analogy

Why It Works

The bread-slicing image converts an unfamiliar 2D plate into a familiar 1D beam problem. Filipino students who have seen bread sliced in a bakery instantly grasp the repeated-unit concept.

Example Usage

When asked for As in mm²/m, just solve the standard beam formula with b = 1000 mm.

Recall Trigger

Slice of bread → 1 m wide beam strip → b = 1000 mm

Topic

Flexural Design per Metre Strip

Concept

Bar spacing formula: s = Ab × 1000 / As

Anchor Id

Difficulty

easy

Memory Aid

Remember: 'ONE BAR times ONE METRE, divided by how many you need.' In symbols: s = Ab × 1000 / As. Think of it as: 'If I need As = 300 mm²/m and each bar gives Ab = 78.5 mm², how many bars fit in 1000 mm? And how far apart are they?' The formula flips the density into a spacing. Mnemonic: 'A-B-ONE-THOUSAND over A-S gives the SPACING.'

Anchor Type

mnemonic

Why It Works

The verbal statement 'one bar times one metre divided by total demand' mirrors the dimensional analysis: (mm²/bar × mm/m) / (mm²/m) = mm/bar = spacing. The dimensional logic makes the formula self-evident.

Example Usage

As = 315 mm²/m, 10 mm bars (Ab = 78.5 mm²): s = 78.5 × 1000 / 315 = 249 mm → round down to 200 mm.

Recall Trigger

Ab × 1000 / As → spacing in mm

Topic

Shrinkage and Temperature Steel

Concept

Shrinkage and temperature steel ratio: ρ = 0.0018 for fy = 415–420 MPa

Anchor Id

Difficulty

easy

Memory Aid

Chant this: 'POINT ZERO ZERO ONE EIGHT — keep the slab from cracking straight! For four-fifteen or four-twenty, point-zero-zero-one-eight is plenty. But for Grade Two-Seventy-Five, point-zero-zero-TWO keeps it alive!' Rhythm: '0018 for the high-grade steel / 0020 for the low-grade feel.'

Anchor Type

rhyme

Why It Works

Rhyme and rhythm create phonological memory traces that are highly resistant to forgetting. The contrast between 0.0018 and 0.0020 is embedded in the rhyme, preventing mix-ups.

Example Usage

fy = 415 MPa, slab h = 200 mm, b = 1000 mm: As,temp = 0.0018 × 1000 × 200 = 360 mm²/m.

Recall Trigger

Shrinkage steel chant: '0018 for 415, 0020 for 275'

Topic

Shrinkage and Temperature Steel

Concept

Shrinkage steel uses full thickness h, not effective depth d

Anchor Id

Difficulty

medium

Memory Aid

Engineer Ben makes a classic mistake on his first board exam review: he uses d = 150 mm instead of h = 175 mm for temperature steel. His reviewer circles the error and writes: 'SHRINKAGE HAPPENS EVERYWHERE — top to bottom! Use h, not d.' Ben pictures the cracks sneaking through the full thickness of the slab like vines growing through the WHOLE wall, not just the bottom. TEMPERATURE STEEL protects the FULL THICKNESS.

Anchor Type

micro_story

Why It Works

The 'vines through the whole wall' image makes the physical reason visceral and memorable. The micro-story also flags this as a real exam trap, raising alertness.

Example Usage

h = 175 mm, fy = 415: As,temp = 0.0018 × 1000 × 175 = 315 mm²/m (not 0.0018 × 1000 × 150).

Recall Trigger

Shrinkage cracks go full height → use h (full thickness), NOT d

Topic

Spacing Limits

Concept

Maximum spacing for main flexural steel: min(3h, 450 mm)

Anchor Id

A10

Difficulty

medium

Memory Aid

MAIN steel → '3 or 450, take the SMALLER.' Remember: 'THREE-h for MAIN, FIVE-h for RAIN (temperature).' The word MAIN starts with M, and the multiplier 3 looks like two humps — a simpler, smaller number for the more critical main steel. Temperature/shrinkage gets a more generous 5 because it is secondary.

Anchor Type

mnemonic

Why It Works

The contrasting pair (3h main vs. 5h temp) is stored as a single memory unit. The alliteration 'FIVE-h for RAIN' is a nonsense hook that distinguishes temperature steel from main steel.

Example Usage

h = 175 mm: main steel max s = min(3×175, 450) = min(525, 450) = 450 mm. Temp steel max s = min(5×175, 450) = min(875, 450) = 450 mm.

Recall Trigger

'Three for Main, Five for Rain (temp)' → check against 450 mm cap

Topic

Spacing Limits

Concept

Maximum spacing for temperature/shrinkage steel: min(5h, 450 mm)

Anchor Id

A11

Difficulty

medium

Memory Aid

Visualize a THERMOMETER — it has a long stem (5 units tall) and a bulb at the bottom. The thermometer represents TEMPERATURE steel. Its spacing is 5h. Now compare with the main steel ruler which is only 3 units long. Side by side: thermometer (5h, tall, temp) vs. ruler (3h, short, main). Both are capped at 450 mm — like a 450 mm steel scale that is the maximum tool length in any case.

Anchor Type

visual_association

Why It Works

The thermometer-ruler visual pair creates a spatial memory. Seeing a thermometer in an exam triggers '5h, temperature steel.'

Example Usage

h = 200 mm, temperature steel: max s = min(5×200, 450) = min(1000, 450) = 450 mm.

Recall Trigger

Thermometer = 5h = temperature steel spacing

Topic

Flexural Design per Metre Strip

Concept

Minimum steel for slabs: temperature minimum often governs over calculated As

Anchor Id

A12

Difficulty

medium

Memory Aid

Cynthia computes the required As for a lightly loaded slab and gets 240 mm²/m. She celebrates — 'Easy!' But her professor adds: 'Check the minimum!' As,temp = 0.0018 × 1000 × 175 = 315 mm²/m > 240. Cynthia must USE 315 instead. Lesson: for THIN slabs with SMALL moments, the temperature minimum is the BOSS. Always check who's bigger — the calculated As or the temperature minimum.

Anchor Type

micro_story

Why It Works

The 'temperature minimum is the boss' framing creates a hierarchy in the student's mental checklist. The story makes the trap emotionally resonant.

Example Usage

As,calc = 272 mm²/m, As,temp = 315 mm²/m → use As = 315 mm²/m.

Recall Trigger

Calculated As < 315 (or As,temp)? → Temperature minimum is the BOSS → use the bigger value

Topic

Two-Way Slab DDM

Concept

Total static moment for two-way DDM: Mo = wu L2 Ln² / 8

Anchor Id

A13

Difficulty

hard

Memory Aid

This formula looks EXACTLY like the simple beam moment formula M = wL²/8, but for a PANEL. Think of a 2D 'super beam': the panel width L2 replaces the unit width b, and the clear span Ln replaces L. The /8 is still there because the physics of a simply-supported beam does not change — you just scaled it up to a panel. Mnemonic: 'EIGHT at the bottom, CLEAR SPAN squared in the middle, PANEL WIDTH on top — just like a beam, but BIGGER.'

Anchor Type

analogy

Why It Works

Anchoring Mo to the familiar wL²/8 beam formula exploits prior knowledge. The student recognizes a pattern rather than learning from scratch.

Example Usage

wu = 12 kN/m², L2 = 5 m, Ln = 4.5 m: Mo = 12 × 5 × 4.5² / 8 = 151.875 kN·m.

Recall Trigger

Mo looks like wL²/8 but uses panel width L2 and clear span Ln

Topic

Flexural Design per Metre Strip

Concept

Rn formula for slab design: Rn = Mu / (φ b d²)

Anchor Id

A14

Difficulty

medium

Memory Aid

Remember: 'Rn is the RESISTANCE NUMBER — Moment over PHI-BEE-DEE-SQUARED.' The phrase PHI-BEE-DEE sounds like 'fee-bee-dee' — a small jingle. Order: M on top, φ·b·d² below. The d² term means depth matters TWICE as much as width — one d for lever arm, one d for effective section. 'Two-dee for the depth, one bee for the width, and PHI for the strength reduction.'

Anchor Type

mnemonic

Why It Works

The jingle 'phi-bee-dee-squared' is aurally distinctive and encodes the exact order of the denominator. The explanation of why d appears squared deepens understanding.

Example Usage

Mu = 15 kN·m/m, φ = 0.90, b = 1000 mm, d = 150 mm: Rn = 15×10⁶ / (0.90 × 1000 × 150²) = 0.741 MPa.

Recall Trigger

Jingle: 'phi-bee-dee-squared' under Mu

Topic

One-Way vs Two-Way Classification

Concept

Slab design classification decision tree

Anchor Id

A15

Difficulty

easy

Memory Aid

Walk through your BAHAY (house): (1) You enter the SALA — ask: 'Is it supported on only two opposite sides?' YES → ONE-WAY (stop here). (2) You walk to the KUSINA — ask: 'Compute Llong/Lshort. Is ratio ≥ 2?' YES → ONE-WAY. (3) You check the KWARTO — ratio < 2? → TWO-WAY. Each room is a checkpoint. Loci: Sala = 2-side check. Kusina = ratio check. Kwarto = two-way confirmed.

Anchor Type

method_of_loci

Why It Works

The method of loci attaches abstract decision steps to familiar physical locations in a Filipino home. The journey through the house encodes the sequence of the decision tree spatially.

Example Usage

Panel supported on 4 sides, 3 m × 7 m: Sala — 4 sides, proceed. Kusina — 7/3 = 2.33 ≥ 2 → ONE-WAY.

Recall Trigger

Walk through your bahay → Sala (2-side?), Kusina (ratio ≥ 2?), Kwarto (two-way?)

Topic

Flexural Design per Metre Strip

Concept

Effective depth d vs total thickness h

Anchor Id

A16

Difficulty

easy

Memory Aid

Picture a SANDO (undershirt) worn by a construction worker. The sando COVERS the steel rebar but leaves a cover layer on top. The TOTAL height (h) = sando height from bottom to top. The EFFECTIVE depth (d) = how far the steel sits from the TOP (compression face). The concrete COVER at the bottom is the fabric hem of the sando — it protects the steel but does not contribute to flexural strength. Always: d = h − cover − ½ bar diameter.

Anchor Type

visual_association

Why It Works

The sando analogy maps h, d, and cover to visual layers that students can mentally measure. The 'hem = cover' image explains why cover is excluded.

Example Usage

h = 175 mm, cover = 20 mm, 12 mm bar: d = 175 − 20 − 6 = 149 mm ≈ 150 mm.

Recall Trigger

Sando: total height = h, steel location = d, hem = cover

Topic

Two-Way Slab Analysis Methods

Concept

Coefficient method for two-way slabs on stiff beams: M = C·w·Ls²

Anchor Id

A17

Difficulty

hard

Memory Aid

Think of the COEFFICIENT C as a TRAFFIC ENFORCER who redirects how much moment goes where. Just like a traffic enforcer adjusts the flow of vehicles based on edge conditions (one-way street, two-way, etc.), the coefficient C is tabulated based on edge conditions (simple, fixed, continuous) and the aspect ratio. The formula M = C·w·Ls² is familiar — it is just wL²/8 with a custom C instead of 1/8. The enforcer (C) changes the fraction.

Anchor Type

analogy

Why It Works

The traffic enforcer analogy makes C's role concrete: it is a context-dependent adjustment factor, not a fixed number. This prevents students from memorizing a single value and applying it blindly.

Example Usage

For a specific edge condition, look up C from NSCP tables, then M = C × wu × Ls².

Recall Trigger

Traffic enforcer = coefficient C → redirects moment based on edge conditions

Topic

Two-Way Slab Systems

Concept

Flat plate vs flat slab vs slab on beams

Anchor Id

A18

Difficulty

medium

Memory Aid

Three siblings in one family: FLAT PLATE is the youngest, born simple — no beams, no drop panels, goes straight from slab to columns. FLAT SLAB is the middle child — still no beams, but wears a thickened HAT (drop panel) or column cap at the top to resist punching shear. SLAB ON BEAMS is the eldest — the responsible one who leans on beams everywhere. At board exam time, remember: 'Plate is plain, Slab wears a hat, Elder leans on beams.'

Anchor Type

micro_story

Why It Works

Sibling story creates a relational memory: the three types are distinguished by their support features, stored as personality traits of siblings.

Example Usage

If a problem says 'slab supported directly on columns, no beams, no drop panels' → FLAT PLATE → use DDM or EFM.

Recall Trigger

Three siblings: Plate = plain, Slab = hat, Elder = beams

Topic

Flexural Design per Metre Strip

Concept

φ = 0.90 for flexure in slabs (same as beams)

Anchor Id

A19

Difficulty

easy

Memory Aid

NINETY PERCENT CONFIDENCE for BENDING. The strength reduction factor φ = 0.90 for flexure (tension-controlled sections) is the SAME for beams AND slabs — because a slab strip IS a beam. No special value to memorize. Chant: 'Flexure is always NINETY!' (φ = 0.90). Shear is 0.75 (SEVENTY-FIVE), but for slab FLEXURE, it is always NINETY.

Anchor Type

mnemonic

Why It Works

The consistent-value insight ('same as beams') reduces cognitive load. Chanting 'Flexure is NINETY' prevents the common error of using φ = 0.75.

Example Usage

Computing Rn for slab: always use φ = 0.90 for flexural steel design.

Recall Trigger

Flexure → always NINETY (φ = 0.90)

Topic

One-Way vs Two-Way Classification

Concept

Long/short ratio — always divide LONG by SHORT (not the reverse)

Anchor Id

A20

Difficulty

easy

Memory Aid

On his first practice exam, Mario computed 3/7 = 0.43 instead of 7/3 = 2.33 for a 3m × 7m panel. He declared it a 'two-way slab' (0.43 < 2) when it is actually one-way (7/3 = 2.33 ≥ 2). His reviewer told him: 'Mario, ALWAYS put the LONG dimension on TOP! The big number goes up!' Remember: LONG over SHORT, ALWAYS. The big number is in the numerator. If the result is ≥ 2, it's one-way.

Anchor Type

micro_story

Why It Works

The specific numerical error (0.43 vs. 2.33) makes the consequence of the mistake viscerally clear. The 'big number goes up' rule is a simple, universal reminder.

Example Usage

Panel 4 m × 6 m: LONG/SHORT = 6/4 = 1.5 < 2 → TWO-WAY.

Recall Trigger

LONG on TOP, SHORT on BOTTOM → result ≥ 2 = one-way

Revision Game

ONE-WAY slab (7/4 = 1.75... wait — 7/4 = 1.75 < 2, actually TWO-WAY! Trick question — always compute carefully: 7/4 = 1.75 < 2 → TWO-WAY). For a simply supported one-way slab, h_min = L/20 × (0.4 + fy/700).

Clue

I am a slab panel that is 4 m wide and 7 m long. My long-to-short ratio is greater than 2. Am I one-way or two-way? What formula gives my minimum thickness if I am simply supported?

Memory Link

A1, A20 — jeepney analogy and 'LONG on TOP' rule. This is a deliberate trick: 7/4 = 1.75, NOT > 2. Always compute, never assume!

ρ_temp = 0.0018, multiplied by FULL THICKNESS h (not effective depth d). As,temp = 0.0018 × b × h.

Clue

I am the temperature steel ratio for a slab reinforced with Grade 60 steel (fy = 415 MPa). What is my value, and do I multiply by h or by d?

Memory Link

A8 (rhyme: '0018 for 415') and A9 (micro-story: shrinkage uses h, not d)

Check: max s = min(3 × 200, 450) = min(600, 450) = 450 mm. Since 220 mm < 450 mm → YES, it is within limits.

Clue

A slab has h = 200 mm and main flexural steel is spaced at 220 mm. Is this within the NSCP maximum spacing limit for main steel?

Memory Link

A10 — 'Three for Main, Five for Rain' mnemonic

Mo = wu L2 Ln² / 8 — the Total Static Moment for the Direct Design Method (DDM).

Clue

I look just like the simple beam moment formula M = wL²/8, but I have two subscripts and I live in two-way slab land. Who am I?

Memory Link

A13 — 'just like a beam, but bigger' analogy

NO. Check minimum: As,temp = 0.0018 × 1000 × 175 = 315 mm²/m > 245 mm²/m. The TEMPERATURE MINIMUM GOVERNS. Use As = 315 mm²/m.

Clue

My computed flexural As is 245 mm²/m for a 175 mm thick slab with fy = 415 MPa. Should I use 245 mm²/m for the main bars?

Memory Link

A12 — 'Temperature minimum is the BOSS' micro-story

φ = 0.90 (for tension-controlled flexural sections, per ACI 318/NSCP 2015).

Clue

I am the strength reduction factor for slab flexure. I am the same as for beam flexure. What number am I?

Memory Link

A19 — 'Flexure is always NINETY' mnemonic

h = (L/10) × (0.4 + 420/700) = (2000/10) × (0.4 + 0.6) = 200 × 1.0 = 200 mm. Round up to 200 mm.

Clue

A cantilever slab spans 2 m with fy = 420 MPa. Compute the minimum thickness in millimeters.

Memory Link

A3 (SS-20, OE-24, BE-28, CANT-10 chant) and A5 (fy = 420 → factor = 1.0 self-check)

Ln = clear span in the direction of analysis (face-to-face of supports). It must be at least 0.65 times the center-to-center span. In the formula Mo = wu L2 Ln²/8, Ln is the span being analyzed and L2 is the perpendicular panel width.

Clue

I am the clear span variable in the DDM total static moment formula. My subscript hints that I am not the same as the center-to-center span. What is my symbol and what do I represent?

Memory Link

A13 — DDM formula analogy: 'just like a beam but with clear span Ln and panel width L2'

fy = 415–420 MPa (Grade 60): ρ_temp = 0.0018
fy = 275 MPa (Grade 40): ρ_temp = 0.0020
fy > 420 MPa: ρ_temp = max(0.0014, 0.0018 × 420/fy) per ACI 318

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CELE Reinforced & Prestressed Concrete — Reinforced Concrete SlabsMemory Anchors

Exam context

Reinforced Concrete Slabs - Memory Anchors

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