Present at Meeting:
This meeting was a follow-up to the last meeting held on November 26, 2001 where it was agreed that Scott Newman would further pursue whether it might be possible to consider installing glulam beams underneath the structure, considering approach grade and hydraulics.
Scott presented some Power-Point slides where 5-foot deep glulam beams installed underneath the structure had been superimposed. This demonstrated that, with the present approach grade, no impacts would be made below the Q100 level. It was questioned whether it might be preferable to install steel beams underneath as they would not need to be as deep and could be concealed by extending the siding. Discussion ensued relative to steel beams being more flexible than wood with different deflections resulting. The properties of glulam are much more compatible with wood than steel. The likely impact on the abutments was discussed. Both are laid-up stone and at one end in particular, a fair amount of stone would need to be removed to accommodate auxiliary support beams under the structure. It was agreed that the following three alternatives seem most reasonable for consideration:
Discussion was suspended to discuss another covered bridge that was originally scheduled for this meeting. While available time was short, it was suggested at the end of the meeting that a vote be taken by those present on their preference of the above 3 options. All but 2 present voted for Option 2 above. It was agreed by those with the dissenting votes that direction could be provided to the Project Manager to move forward with Option 2. J. B. McCarthy, the Structures Program Manager, expressed possible concerns with the costs that might be associated with Option 2. We agreed that it would be left that the Committee recommendation will be to move forward with Option 2, but that if the Project Manager, during the course of project development, developed cost estimates that in his opinion render this option unreasonable, he will request another meeting of the Committee.
[This article was originally posted February 21, 2002]