We don't just design and build bridges. We connect you and me — and turn ‘you and I’ into ‘we.’
The Bridge Book grows like a tree: the root is What is a bridge?, the trunk is the history, and each branch is a specialist chapter: types, loads, materials, superstructure, foundations, construction, bearings, inspection. Short sections that end on purpose; read one and come back.
Tap a root, the trunk or a branch to open that chapter
A random site with hidden ground and an impatient client. Read the brief, drill, set the deck level and the spans, choose deck type and construction method for each span group, then a foundation and a way of working for each ground zone (land, wetland, water), build it, and see what a senior engineer would have done. Rankings per crossing type, top ten each.
«««●»»»Game startinsert coin: none · random site · your call
Every tool on this page runs in your browser — no login, no install, nothing to download. Tap a tile to jump straight to it. New tools are added as they are built and verified.
Section PropsA · I · S · rarea, inertia, moduli — incl. girdersOpen →
Beam AnalyzerSFD · BMDmulti-span shear, moment, deflectionOpen →
Frame & Trussportal · trussportals and trusses, live diagramsOpen →
Spread Footingbearing · shearbearing, shear, punching, steelOpen →
Anchor BoltACI Ch.17ACI 318 Ch.17 single anchorsOpen →
Budget Estimatorcost modelearly cost bracket by bridge typeOpen →
FCM Sizebalanced cant.balanced-cantilever box sizingOpen →
Girder DepthL/d bandsAASHTO depth bands by spanOpen →
Span Recommendertype vs spanwhich bridge type fits the spanOpen →
Expansion Jointmovementthermal + creep & shrinkage demandOpen →
Bearing Padelastomericelastomeric pad area & thicknessOpen →
PT Elongationfriction lossfriction loss and field elongationOpen →
Method SelectorerectionMSS, FCM, ILM, precast comparedOpen →
Abutment SizerproportionsRankine stability + steel estimateOpen →
Stay Cablecatenaryexact stay geometry, as-built checkedOpen →
Distribution FactorAASHTO 4.6.2.2LLDF: interior, exterior, lever rule, skewOpen →
HL-93 EnvelopeM & Vtruck + tandem + lane, 1–3 spansOpen →
Load RatingLRFR RFinventory & operating rating factorsOpen →
Pile CapacityAXIAL φRNskin friction + end bearing by layerOpen →
Development LengthAASHTO 5.10.8tension, hooks & laps with factorsOpen →
Pier ColumnP-M + KL/Rslenderness + interaction quick checkOpen →
Prestress Losses5.9.3.3 APPROXES + long-term lump sum → fpeOpen →
Wind LoadAASHTO 3.8PZ on super & substructureOpen →
Scour DepthHEC-18 CSUpier local scour estimateOpen →
RC Beam Design5.6.3 φMN·φVNflexure + shear check, required AsOpen →Six erection methods, animated. Watch a superstructure go up from pier table to pavement, scrub the timeline step by step, and read where each method wins — spans, strengths, and the cases it was made for.
Tens of thousands of photographed bridges on one map — tap a pin to open the photograph and the structural data behind it: span, system, engineer, and a note on why the form works. Filter by region or structural family, or search by name.
A growing forensic library of bridge failures, 1807 to today — the mechanism, the cause chain, and what the design codes changed. Because every clause in today's codes was paid for.
A verified question bank across all fourteen knowledge areas — every numeric answer computed and cross-checked in Python before publishing. Pick a mode; the exam room is one click away.
The real FE format: all 14 knowledge areas in exam proportions, question palette, optional break after Q55, Section 1 lock — auto-submits at time-out.
Original practice problems in the style of the NCEES FE Civil exam · not affiliated with or endorsed by NCEES
Pick a kind to open the index filtered to it.
The latest briefs - collapse & safety, new projects, and new technology - synthesized from the sources, never copied. Tap a card for the full archive.
Notes on bridge engineering, design thinking, and the view from the field - posted here in parallel with LinkedIn. Tap a card to read more.
