AASHTO LRFD BRIDGE DESIGN SPECIFICATIONS 4TH EDITION PDF

All rights reserved. Load-indicating devices which incorporate a self-indicating feature to signal sufficient bump compression shall also be considered permissible for use. If the bolt is tensioned so that no visible gap in any space remains, the bolt and DTI shall be removed and replaced by a new properly tensioned bolt and DTI. The welding shall conform to and all welders shall be qualified in accordance with the requirements of the current AWS D1.

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Send an email to support bridgewiz. Dead load is usually represented by self-weight of girders, the weight of deck and superimposed dead loads.

Compression and tension stress limits usually govern the design of the prestressed precast girders. Compression stress and tension stress check have been performed using two different load combinations. These load combinations include only dead and live load cases. The dead load stresses need to be cumulatively added to each other following directly the stages of the construction. The dead load has three main parts: self-weight of the girder, deck weight and superimposed dead load.

Superimposed dead load represents non-structural dead loads that remain permanently on the structure such as wearing surface, sidewalk and fences. In design, maximum compression and tension stresses develop at mid-span of the structure. It is important to compute the force effects at mid-span due to self-weight of the girder.

The wet weight of the deck will act on the girder section. The girder will deflect due to this additional load that will increase the compression and tension stresses at the mid-span. In stress computations, we will not use the composite section properties since the deck does not gain its stiffness immediately after casting concrete. The superimposed dead loads are typically non-structural dead loads that have been added to the system at later stages to meet the requirements of a highway pass over a bridge.

Some of these items are: wearing surface, sidewalk and railings.

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