© ALLPLANĪllplan Bridge - a complete, integrated BIM solution for bridges - has been recently updated to address this need. Because girders are straight, their geometry is not directly impacted by the road or bridge axis. That is why precast girder bridges require a different modeling approach.įigure 1.
Similarly, their final position on the bridge is dictated by the geometry of the supporting substructure. The straight profile of precast girders is why their geometry is not directly impacted by the road or bridge axis (Figure 1). While there are different types of precast girder bridges, they all have one thing in common - their component geometry. In addition, the economy and high quality of prefabricated girders creates savings for transport authorities while minimizing the environmental impact and disruption to the local area during construction. The rapid erection enables contractors to work on more projects simultaneously and poor weather conditions have a minimal effect on the construction schedule. Because precasting eliminates many on-site, in-situ work processes, construction time and costs are reduced, and quality is improved. Precast concrete bridges have been in use since the late 1950s and are commonly used for highway bridges. Precast girder bridges are one example of this, as their geometry is only indirectly governed by the axis. As bridges come in many types and each requires different construction methods, some require a different approach to modeling. However, most modeling techniques are particularly suited to bridges whose geometry is governed by the bridge axis or alignment. With the rise of Building Information Modeling (BIM) being used for infrastructure, 3D bridge modeling has become more popular.
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