This webinar will provide a comprehensive assessment of stability at all stages in the life of the girder—including both lifting (hanging from lifting devices) and hauling (support from beneath) conditions. Currently, lateral stability of precast/pretensioned concrete bridge girders is a concern during handling and hauling. Unstable girders can fail suddenly with catastrophic effects on workers and property.
With improvements in material properties and fabrication practices, single-piece pretensioned bridge girders are becoming increasingly more slender. This has resulted in more girders that cannot be safely lifted or transported without significant post-design re-engineering and/or special attention during construction. From the precasting stage of a girder through to the erection stage, there may be several intermediate stages that warrant special attention to ensure that all is well and safe.
We will be presenting the underlying theory in clear, understandable terms, along with providing practical design guidance to help bridge designers ensure that their girder designs can be safely handled and hauled at stages between bed and bridge. For fabricators, techniques will be presented for improving girder stability and serviceability for cases where handling was not factored into the initial girder design. There will be downloadable handouts containing design examples and field-tested engineering details.