B10 · Intermediate · 1–2 hours

BS 8110 — continuous one-way slab (Table 3.12)

Continuous one-way solid slab with simply supported or continuous end: Table 3.12 moments and shears, steel at each location, span/d, shear and bar spacing.

Tool: Education preview · Lesson: In preparation · Example: Built awaiting check · Workbook: Not applicable · Assessment: Not started

Outstanding before release: Engineering checker to verify clause mapping against BS 8110-1 and sign off v0.1.0. Cross-checked against TCC RCC91 One-way Solid Slabs (Tables) (see evidence).

Sources

Role	Source	Note
Primary	BS 8110-1:1997 (+A1–A3): 3.5.2.3 & Table 3.12 (conditions: bay > 30 m², Qk ≤ 1.25Gk, Qk ≤ 5 kN/m²); 3.4.4.4; Table 3.25; 3.5.5 (shear, no links); 3.4.6; 3.12.11.2.7	Withdrawn standard — education and legacy checks only (mapping awaiting checker verification)
Supporting	Cross-check reference: The Concrete Centre RCC91 One-way Solid Slabs (Tables) (external tool; not used in the implementation)	Comparison evidence only (mapping awaiting checker verification)

"Primary" marks the governing clause for this exercise; "contextual" marks related clauses; "supporting" marks the design-method or data source outside the CDC. A CDC chapter mapping does not mean the CDC contains the equation used.

Prerequisites: B01 BS 8110 — one-way solid slab · Topics: Reinforced concrete

Lesson

Lesson in preparation. No content is published until it has been written and reviewed.

Calculator

Purpose: Design of a continuous one-way solid slab of three or more spans using Table 3.12.

Model: Per metre width. Simple end: end span 0.086, first interior −0.086, interior span 0.063, interior support −0.063; continuous end: end support −0.04, end span 0.075. Shears 0.40F (0.46F continuous end), 0.60F, 0.50F.

Units: N, mm, kN, kNm; stresses in N/mm² Ranges: fcu 25–50 N/mm²; fy 250 / 460 / 500; βb 0.7–1.0

Equations: F = (1.4gk + 1.6qk)L per metre ; M = coefficient × F × L ; spacing s = floor25(πØ²/4 × 1000/As) and clear ≤ min(3d, 750) ; v = V/(1000d) ≤ vc (no shear reinforcement)

Clauses: 3.5.2.3 & Table 3.12 (conditions: bay > 30 m², Qk ≤ 1.25Gk, Qk ≤ 5 kN/m²); 3.4.4.4; Table 3.25; 3.5.5 (shear, no links); 3.4.6; 3.12.11.2.7

© 2026 QP Academy. Original calculation software implementing BS 8110-1:1997 (+A1, A2, A3). BS 8110 is WITHDRAWN (superseded by BS EN 1992-1-1 and, in Singapore, SS EN 1992-1-1). For education and for checking legacy designs only — not for new design submissions.

Not covered: Fewer than 3 spans; bay ≤ 30 m²; Qk > 1.25Gk or > 5 kN/m²; Slabs needing shear reinforcement; concentrated loads; openings

Version 0.1.0 Draft

EDUCATION PREVIEW — NOT YET INDEPENDENTLY CHECKED. Education preview: this calculator has not yet been independently checked by an engineer. Use for learning only — not for engineering use. Outputs are stamped and must not be used for engineering work.

Project / exercise reference

Enter ultimate (factored) design actions. Load example

Number of spans (3 or more) (no.)Longest effective span L (m)End support conditionBay area > 30 m² and spans approximately equal (3.5.2.3)Slab thickness h (mm)Cover to main bars (mm)Additional dead load (finishes, services) (kN/m²)Concrete density (kN/m³)Imposed load qk (kN/m²)Bar Ø — end span bottom (mm)Bar Ø — first interior support top (mm)Bar Ø — interior span bottom (mm)Bar Ø — interior support top (and continuous end) (mm)Concrete cube strength fcu (N/mm²)Supported 25–50 N/mm²Main steel characteristic strength fy (N/mm²)

Excel workbook

The workbook is available with the calculator once this version is released.

Exercises

Assessment in preparation.

About this academy. Exercises use fictional or permission-cleared data and are simulated training, not supervised project experience. Completing modules does not confer professional registration, LTA approval or recognised Singapore working experience, and does not guarantee employment. Calculators produce preliminary outputs for learning and checking; they are not PE-endorsed designs. Official requirements are in the documents published by LTA and other issuing bodies — always use the edition your contract specifies.