The Bridge Enginerd
Design
A toolbox for bridge engineers, to AASHTO LRFD. Every tool runs in your browser: no sign-in, nothing to install, and every result can be printed or shared as a link.
Bridge Deck Design
Concrete deck on girders: design moments, top and bottom reinforcement, crack control, section drawings and quantities.
AASHTO 4.6.2.1 · 5.6 Open tool → Concrete · LiveDeck Slab Check
Interior deck span with Table A4-1 moments: check chosen bars for strength, minimum steel, crack control, distribution and temperature steel.
AASHTO A4-1 · 5.6.7 · 9.7.3 Open tool → Planning · LiveBridge Layout
General layout on integral end bents: stations of fill faces, bents and bearings, and precast girder lengths for any number of spans, with skew.
MoDOT EPG 751.22.1.4 Open tool → Concrete · LivePrestressed Girder Design
AASHTO I-girder with a composite deck: strand pattern, losses, stresses at transfer and service, flexural strength and the strands you need.
AASHTO 5.9 · 5.6.3 Open tool → Steel · LiveSteel Beam Design
Simple-span W-beam bridges, composite or noncomposite: finds the lightest passing shape, then checks strength by unbraced segment, the deck pour, Service II, fatigue, shear, deflection and studs.
AASHTO 6.10 · A6 · 6.10.10 Open tool → Loads · LiveHL-93 Envelope
Maximum moment and shear along a simple span from the design truck, tandem and lane load, with IM.
AASHTO 3.6.1.2 Open tool → Loads · LiveDistribution Factor
Interior and exterior girders, moment and shear: equations, lever rule, rigid body and skew corrections.
AASHTO 4.6.2.2 Open tool → Rating · LiveLoad Rating
LRFR rating of a girder: HL-93 inventory and operating, AASHTO legal loads, SU4–SU7 and emergency vehicles, with safe posting loads.
AASHTO MBE 6A.4 · 6A.8 Open tool → Sections · LiveSection Properties
Plate girders, AASHTO I-girders, tees and rectangles, alone and composite at n and 3n, with the steel plastic moment.
AASHTO 6.10.1 · D6.1 Open tool → Planning · LiveGirder Depth
Traditional minimum depth for slabs, T-beams, prestressed I-beams, box beams and steel girders, compared side by side.
AASHTO 2.5.2.6.3 Open tool → Bearings · LiveElastomeric Bearing
Steel-reinforced pads by Method B: stress, combined shear strain from load, rotation and movement, stability, shims and anchorage.
AASHTO 14.7.5 Open tool → Joints · LiveExpansion Joint
Thermal, shrinkage and creep movement, how far the joint opens and closes from its setting temperature, and the joint type that fits.
AASHTO 3.12.2 Open tool →Prestress Losses
Elastic shortening and the approximate long-term losses to the effective prestress.
Development Length
Tension development, hooks and lap splices with the modification factors.
Pile Capacity
Axial resistance from skin friction and end bearing, layer by layer.
Preliminary design and teaching tools. Each one shows its method and code references; a licensed engineer must check and seal any design for construction. Tell us which tool to build next in Discussions.
Worked examples on YouTube