ABSTRACT
Introduction............................................................................................................ 167 Bridge.Description.and.Condition.......................................................................... 168 Material.Structure.of.Wrought.Iron....................................................................... 170 Mechanical.Testing.Methods................................................................................. 173 Test.Results.and.Discussion.................................................................................... 174
Tension.Tests............................................................................................... 174 Hardness.Tests............................................................................................. 177 Impact.Tests................................................................................................. 179
Conclusions.and.Future.Work................................................................................ 180 Acknowledgments.................................................................................................. 181 References............................................................................................................... 181
Penns.Creek.Bridge.was.a.93.foot.long.Pratt,.through.truss.originally.constructed.in. 1886.over.Penns.Creek.in.Penn.Township,.Centre.County,.Pennsylvania.(Figure.9.1).. The.primary.structural.members.of.the.trusses.were.constructed.of.wrought.iron,. with.cast.iron.joints.at.the.ends.of.the.upper.chord.and.at.the.supports..The.design. and. construction. have. been. attributed. to. the. Columbia. Bridge. Works. of. Dayton,. Ohio.based.on.several.unique.features.of.the.truss..In.1999.Penns.Creek.Bridge.was. determined.to.be.National.Register.eligible.as.a.locally.significant.example.of.a.Pratt,. through.truss.with.all.of.its.primary.structural.elements.in.unaltered.condition.8,17. The. bridge. was. offered. for. sale. and. relocation. for. several. years,. but. no. suitable. preservation. plans. came. to. fruition.. In. early. June. 2007. Penns. Creek. bridge. was. removed.from.service,.and. it.has.since.been. replaced.with.a.prestressed.concrete. beam.bridge.
