EXPERIMENTAL INVESTIGATION OF FOLDED PLATE GIRDERS AND SLAB JOINTS USED IN MODULAR CONSTRUCTION

The folded plate girder, a newly proposed bridge girder, is investigated through this thesis. The folded plate girder is cold bent out of a single sheet of steel. The cold bending eliminates the costly and inconsistent shop welds found in traditional girders. The folded plate girder is meant for application in short span bridges. The girder was subjected to an equivalent 75 year lifetime loading to investigate the fatigue performance. The rebar detail used in the closure region between adjacent slabs has been investigated in the past by the NCHRP 12-68 project. This thesis will proposes a hooked rebar detail as a cost effective alternative to the previously recommended headed rebar detail. The proposed hooked rebar detail looks to improve upon the headed bar detail by increasing the clear cover, and reducing the cost of fabrication and shipment of the rebar. Six specimens containing closure regions are subjected to both positive and negative moment loading in order to investigate their behavior and failure modes under ultimate load.

EMERSON AS A ROMANTICIST

It was the romanticists who tended to write poetry of “autobiography,” who inquired of themselves concerning themselves, and assumed that the world was interested in what they found. Nor was the habit of self-consciousness regarding the poetic office let drop by their successors. That the words poet and poetry were so often on Emerson’s lips would be evidence enough to students of literature, in its changing temper and shifting modes, of his probable localization in time. It is also evidence of his relation to certain European movements of thought to which he gave—comparatively late in their currency and much tempered —American expression. In his doctrine of the superiority and the aloofness of the poet, of the latter’s severance from others to whom he yet bears messages of light, in his self-sufficiency and his sovereignty, his belief in the intrinsic goodness of nature and of man, and his concern with poetic thought rather than poetic form, Emerson may be termed the American representative of ideas which already had had wide circulation in Europe. In great part they emanated from Rousseau, and some of them, especially the gospel of the rights and the supremacy of the individual, had metamorphosed the politics and the map of Europe as well as its literature.

Comparison of crystalline thin poly(vinylidene (70%)–trifluoroethylene (30%)) copolymer films with short chain poly(vinylidene fluoride) films

We compare the photoemission and electron energy loss spectra of crystalline poly(vinylidene-fluoride with trifluoroethylene: 70%: 30%), P(VDF–TrFE), films, fabricated by the Langmuir–Blodgett technique and annealed in vacuum, with in situ thermally evaporated films of poly(vinylidene-fluoride) (PVDF) in vacuum. The electronic structure and vibrational modes of the short chain PVDF films compare well with the crystalline P(VDF–TrFE) films indicating that vacuum annealed films prepared ex situ are free of significant surface contamination once vacuum annealed. The electronic structure for the short chain PVDF films exhibits, however, different temperature dependence than the crystalline P(VDF–TrFE) films. PACS: 68.47.Mn; 71.20.Rv; 63.22.+m; 73.22.-f