// personal study reference — civil engineering

Notes, formulas and working models,
drawn out properly.

A single place to keep structural, geotechnical and transportation notes — built with small interactive tools and real reference data instead of static PDFs, so the concepts are easier to actually check.

SPAN 18.0 m — WARREN TRUSS
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subject sheets indexed
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ISMB 400 self-weight, IS 808:2021
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L/360 limit, 6 m span
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free NPTEL courses linked

Sheet Index

Every subject gets its own reference sheet — same structure every time: key formulas, worked examples, code clauses.
S — 101

Structural Analysis

Beam and frame analysis, shear force / bending moment diagrams, deflection, influence lines, IS 800 & ACI 318 clause references.

G — 201

Geotechnical Engineering

Soil classification, bearing capacity, consolidation settlement, slope stability, foundation design checks.

T — 301

Transportation Engineering

Pavement design (flexible & rigid), geometric design of highways, traffic flow fundamentals, intersection design.

E — 401

Environmental Engineering

Water treatment unit processes, wastewater design flows, air quality basics, solid waste management.

C — 501

Construction Management

CPM/PERT scheduling, estimation and costing, quality control, project delivery methods.

SU — 601

Surveying

Leveling, traversing, total station and GPS basics, contouring, area and volume computation.

Beam Lab

A simply supported ISMB 400 steel beam, 6 m span, central point load. Drag the load and watch the deflected shape update.
P = 40 kN
2.65 mm
midspan deflection
δ < L/360 (16.7 mm) — within limit
ISMB 400 (IS 808:2021): Ixx = 20,458.4 cm⁴, weight 61.6 kg/m, E = 200 GPa.
δ = PL³ / 48EI, L = 6 m. Curve shown at 12× visual scale for legibility.

Reference Data

Real IS 808:2021 rolled-steel section properties, worth keeping on hand instead of re-searching every time.
Section Depth × Width Weight Ixx Zxx Typical use
ISMB 400 400 × 140 mm 61.6 kg/m 20,458.4 cm⁴ 1,022.9 cm³ Primary beams, lintels, columns
ISHB 400 400 × 250 mm 77.4 kg/m 34,882.2 cm⁴ 1,744.1 cm³ Columns, heavy-duty wide-flange work
ISLB 400 400 × 165 mm 50.4 kg/m 21,934.6 cm⁴ 1,096.7 cm³ Secondary beams, lintels
ISMC 400 400 × 100 mm 49.4 kg/m 20,458.4 cm⁴ 1,022.9 cm³ Purlins, bracing, staircase stringers
Source: IS 808:2021, Hot Rolled Structural Steel Sections. Cross-check against the current edition before using in a real design.

Free Courses Worth Your Time

A few NPTEL courses (IIT faculty, free to audit) that pair well with the sheets above.
NPTEL · IIT MADRAS

Introduction to Civil Engineering Profession

Prof. Ravindra Gettu & Prof. Koshy Varghese — a good first course before specialising into any one sheet above.

NPTEL · IIT BOMBAY

Geotechnical Engineering – II

Prof. D. N. Singh — pairs with the G-201 sheet: foundations, bearing capacity, slope stability.

NPTEL · IIT ROORKEE

Geometric Design of Highways

Prof. Rajat Rastogi — direct companion to the T-301 transportation sheet.

NPTEL · IIT DELHI

Concrete Technology

Prof. B. Bhattacharjee — mix design and material behaviour underlying most of the structural sheet.

NPTEL · IIT BHUBANESWAR

Advanced Structural Analysis

Prof. Devesh Punera — a step up once the S-101 sheet's basics feel solid.

NPTEL · IIT MADRAS

Admixtures and Special Concretes

Prof. Manu Santhanam — useful once basic concrete technology is familiar.

What else belongs here

The parts worth adding next, once the core notes are in place.

Code & standards lookup

Searchable clause references from IS 456, IS 800, IS 1893, so you're not digging through PDFs mid-problem.

Previous year papers

Tagged by subject and year, with worked solutions attached rather than answer keys alone.

Detail library

Simple sketches of standard details — footing, beam-column joint, staircase — for quick revision before exams.

More live calculators

Concrete mix design, earthwork cut/fill volumes, column slenderness checks — same interactive format as the beam lab.

Site visit log

Photos and notes from any site visits or internships, organised by what was learned rather than just dated entries.

Glossary

Terms that took a while to click, explained in your own words — often the most useful page to come back to.