Scouring in Bridge & Mitigation | Scour mechanism | Types

Scouring in bridge  Scouring is defined as the lowering or loss of top bed soil (erosion) around the bridge piers, abutments, spurs etc. due to the water flow currents. Scouring is always a potential threat to bridge stability eventually it can lead to foundation failure. As per the research data 60% of bridge failure in … Read more

Deflection Walls, Wall Piers & Crash Walls | Design Criteria, Loads & Specifications

Deflection Wall cum Blade Pier

Deflection Walls or Crash walls Deflection Walls or Crash walls are huge wall shaped reinforced concrete structures provided for the protection of piers and abutments in the vicinity of railway tracks. The purpose of deflection wall is to prevent head-on collision or impact from derailed trains on the primary structural support elements. It is also … Read more

10 Design Loads on Bridges | Highway & Rail Bridge | Miscellaneous Loads

HL93 Truck Position for Maximum Saggin Moment in Span 1

Calculating Design Loads and loading bridge model is one the most sophisticated part in the design of any Bridge. Find below all important loads to be considered in the design of a Bridge. Dead Load “Gravity loading due to structural parts of bridge” Dead consist of permanent gravity forces due to structural Elements. It is … Read more

Impact Factor | Dynamic Allowance in Design | Causes | Characteristics | Bridge Loads

Impact Factor is considered for Vibration induced by Truck on Bridge

Impact Factor Vehicular Live loads are multiplied with an Impact Factor to accommodate this dynamic effect in the design of bridges. The dynamic loads for moving vehicles are considered Impact in bridge engineering because of the relatively short duration. The magnitude of the impact factor depends on the bridge span, stiffness and surface roughness, and … Read more

HL-93 AASHTO Vehicular Live Loading | Truck | Tandem | Design Lane Load

HL-93 Design Truck AASHTO

HL-93 is a type of theoretical vehicular loading proposed by AASHTO in 1993. It is used as the design loading for highway structures in USA and other countries where AASHTO code is followed. AASHTO HL-93 vehicular live load is a combination of three different loads, HL-93 Design Truck (formerly, HS20-44 Truck) HL-93 Design Tandem (formerly, … Read more