<p>A 132 m long hybrid UHPC-steel bridge with 6 spans is currently being built across the river Fulda in Kassel, Germany. UHPC offers supreme durability characteristics and, hence, has been selected for the replacement of an existing, damaged timber structure. The novel structural concept consists of a hybrid steel – UHPC truss structure and precast UHPC plates for the bridge deck. The deck plates are glued to the upper chords of the truss structure. For the transfer of shear forces from the truss diagonals (steel tubes) to the UHPC chords, prestressed bolted friction connections are used. The paper describes the conceptual design, the final design, accompanying tests and the erection of the bridge structure. A monitoring system will be installed in order to gather practical experience with the new materials and the novel structural concept.</p>
Statistische Grundlagen und Voraussetzungen zur Anwendung des Treppenstufen‐Verfahrens bei Dauerschwingversuchen. Nach diesem Verfahren Ermittlung der Zeitschwingfestigkeit, der Kerbwirkungszahl sowie der Schadenslinie an glatten und gekerbten Proben aus Stahl Ck 10 im Umlaufbiegeversuch.
Ursachen für die Streuungen der Ergebnisse von Dauerschwingversuchen. Auswertung der Ergebnisse von Versuchen an Aluminiumlegierungen, Stahl und Gußeisen in 37 Versuchsgruppen zu je rd. 100 Proben unter Dauerschwingbeanspruchung im Gebiet der Zeitfestigkeit durch statistische Verfahren. Verteilungsgesetz der Bruchlastspielzahlen. Streuungsbeurteilung durch Berechnung der Mittelwerte der relativen Standardabweichung der Logarithmen der Bruchlastspielzahlen. Abhängigkeit der Streuung der Logarithmen der Bruchlastspielzahlen von verschiedenen Einflußgrößen, besonders vom Gehalt an nichtmetallischen Einschlüssen im Werkstoff, Probendurchmesser, von der Oberflächenbeschaffenheit und der Probenherstellung, Bedeutung der Kerbwirkung; Abhängigkeit der Logarithmen der Bruchlastspielzahlen von der Probenhärte.
Although cellulose caprates have been made previously, the processes used degraded the cellulose to some extent since the objective was to make products that would be soluble in organic solvents. This paper describes a method of preparing, possibly for the first time, a partial capric ester of cotton cellulose in fabric form, employing conditions that do not degrade the cellulose significantly. The method consists of a presoak in pyridine followed by treatment with capric anhydride. Partial esterification was shown by dyeing characteristics and chemical analysis of the modified cotton; by hydrolysis of the treated fabric and determination of the neutralization equivalent of the isolated capric acid; and by the preparation of a derivative of the capric acid recovered from the fabric. The fabric showed considerable water repellency and some rot resistance.
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