LOADS BRIDGE LOADING AND RATING. Dead Load. Types of Loads
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1 BRIDGE LOADING AND RATING LOADS 0 1 Types of Loads Bridges are subjected to many different types of loads. There are three important types of bridge loads: Dead load Live load Other loads Dead Load Dead load consists of the self weight of the bridge. The load is usually stationary and permanent. Typical dead loads are: Beams and girders Concrete deck Asphalt wearing surface Curbs Railing 2 3 1
2 Live Load Live loads are usually temporary and are applied in a short duration of time. The loads are usually moving. Typical types of live loads are: Truck load Dynamic load allowance (impact) Pedestrian load Longitudinal live load Other Loads The bridge is subjected to other loads beside dead and live load. Other typical bridge loads are: Wind load Earth pressure Ice pressure Temperature effects Collision loads 4 5 Rating Bridges Many older bridges were designed to carry smaller and lighter trucks. Are these older bridges capable of carrying today s heavier and longer legal truck configurations? Bridges are rated to determine the load carrying capacity of the bridge. Generally only the superstructure is load rated. The ratings normally assume that the bridge is in good structural condition. Real Truck Configurations There are many truck configurations that can legally travel on Alberta roads. The truck configurations are grouped into three categories: Single unit trucks Tractor semi trailers Truck trains Within each of the categories there are many different weights and axle configurations
3 Typical Legal Single Unit Trucks Typical Legal Single Unit Trucks 22.5 tonnes 39.5 tonnes 5.5 t 8.5 t 8.5 t 5.5 t 8.5 t 8.5 t 8.5 t 8.5 t tonnes 6.1 t 6.1 t 8.5 t 8.5 t 29.2 tonnes 5.5 t 8.5 t 8.5 t 8.0 t 8.0 t 8.0 t tonnes t 8.5 t 8.5 t 9.1 t 8.5 t 8.5 t Typical Legal Truck Trains Rating Truck Models 5.5 t 8.5 t 8.5 t 8.5 t 8.5 t 8.5 t 8.5 t t 8.5 t 8.5 t 8.5 t 8.5 t t t 7.5 t t 8.5 t 8.5 t 8.0 t 8.0 t 8.0 t 8.5 t 8.5 t tonnes 60.5 tonnes 63.5 tonnes Each one of the trucks produces unique forces and stresses in the bridge. It is not practical to load rate the bridge for each one of the real truck configurations. A model truck is used to represent each one of the truck configuration categories. CS1 Rating Truck Model Single unit trucks CS2 Rating Truck Model Tractor semi trailer CS3 Rating Truck Model Truck trains
4 Rating Truck Models Load Rating a Bridge 7.0 t 21.0 t t 21.0 t 21.0 t t 18.8 t 18.8 t 18.8 t CS1 Rating Truck Model 28 tonnes CS2 Rating Truck Model 49 tonnes CS3 Rating Truck Model 63.5 tonnes for Primary & Secondary Highways 54 tonnes for Local Roads Step 1 calculate load carrying capacity of critical member Step 2 calculate Dead Load this member is required to carry Step 3 member capacity less Dead Load, etc. is Live Load that the member can carry Rating Equation Rating Equation Where: LLRF = R D L (1 + I) LLRF = live load rating factor (fraction of the rating truck the bridge can safely carry) R = load the bridge can safely carry D = dead load of the bridge L = live load due to the rating truck model I =impact factor Rating Equation (Cont d) Live load rating factor (LLRF) is calculated for each rating truck model. A LLRF of 1.0 or greater indicates that the bridge is capable of safely carrying the current legal load for the particular truck category
5 Legal Loads Highway Type CS1 Truck Single Unit CS2 Truck Semi Trailer CS3 Truck Truck Trains Primary Secondary Local Note: Loads are expressed in tonnes 16 Bridge Load Evaluation Manual For further information refer to Alberta Transportation Bridge Load Evaluation Manual at: 5
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