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Bridges and Structures

Local Road Standard Bridge Drawings

In consultation with the Alberta Association of Municipal Districts and Counties (AAMDC) Alberta Transportation has developed standard bridge designs that can be used on local roads that are not part of the provincial highway system.† Application of these local road standard bridge designs shall be limited to sites, with conditions that satisfy the design requirements and assumptions of the standard design and the Local Road Bridge Design Guidelines.

Two separate local road standard bridge superstructure designs are available depending on bridge length requirements.† For bridge lengths of 12m or less a superstructure consisting of the Departmentís standard SL precast concrete girders is expected to provide an economical solution.† For longer bridge length demands, a steel girder superstructure utilizing precast concrete deck panels is expected to provide an economical solution.† Standard local road bridge designs for 18.684m and 24.400m long single span bridges have been developed utilizing this superstructure type.† Both the SL and steel girder superstructure alternatives include single and two lane configurations.† Refer to the Local Road Bridge Design Guidelines for guidance for use of single lane bridges.

An engineered foundation utilizing driven steel piles is included in the local road standard bridge designs for the above noted single span superstructure lengths.† Non engineered details for a geotextile reinforced soil (GRS) foundation option have also been provided.† However, the use of the GRS foundation system requires a site specific engineered design and the user shall be fully aware of the risks associated with the use of this type of shallow foundation.† It is recommended that a risk assessment along with a cost benefit analysis be performed before pursuing a GRS foundation option.