Guidelines for Seismic Design of Road Bridges
View at irc.nic.inWhat this code covers
Seismic design provisions for road bridges in India: site classification, ground motion parameters, analysis methods (elastic response spectrum, time-history), ductile detailing, and isolation devices. Replaces IS:1893 guidance for bridge-specific seismic design.
What this means on site
Mandatory on projects in seismic zones III, IV, and V. NHAI pre-qualification increasingly requires bridge design to certify IRC:SP:114 compliance. Seismic isolators and ductile pier detailing affect cost and programme. Verify zone classification in the tender's DPR before bidding.
Other bridge & structures codes
Code of Practice for Concrete Road Bridges
Design and construction of plain, reinforced, prestressed, and composite concrete bridges using Limit State Design (LSD). Concrete grades up to M90. Replaces IRC:21 and IRC:18.
Standard Specifications and Code of Practice for Road Bridges, Section II: Loads and Load Combinations
Load classifications: Class 70R, Class A, Class AA. Dead loads, live loads, impact effects, wind loads, temperature effects, and seismic design guidelines for road bridges.
Standard Specifications and Code of Practice for Road Bridges, Section VII: Foundations and Substructure
Subsurface exploration requirements, design of open foundations, well foundations, pile foundations; piers, abutments, and retaining walls. Applies to bridges, viaducts, culverts, and grade-separated structures.
Guidelines for the Design of Small Bridges and Culverts
Design standards for small bridges (6–30m span) and culverts (up to 6m). Cross-drainage structures at nallas, irrigation channels, and seasonal streams on rural and state highway projects.
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