Die Dresdner Flügelwegbrücke wurde 1930 als eine der größten genieteten Stahlvollwandträgerbrücken Europas errichtet. Jüngere Brückennachrechnungen ergaben zu geringe Beulsicherheiten in den Stegfeldern der Hauptträger. Die ursprüngliche Bemessung erfolgte nach einem Zugfeldmodell. Zur Beurteilung der Standsicherheit der Brücke bis zu einem geplanten Neubau wurde u. a. eine nichtlineare FEM‐Berechnung unter Berücksichtigung der Vorverformung und der plastischen Umlagerungen zur Bestimmung der Traglast herangezogen, die hier genauer beschrieben wird. Die Berechnungen bestätigen die Ausbildung eines Zugfeldes, es wurde die überkritische Traglast bestimmt. Im Ergebnis konnte einer zeitlich begrenzten Nutzung der Brücke ohne Lastbeschränkung zugestimmt werden.

The African cement, concrete and construction business is growing at rapid pace. The cement sales are expected to grow rapidly until 2050. The number of newly built cement plants increases dramatically and in addition more cements are being imported from outside the continent, e.g. from Turkey, Pakistan, Indonesia, and China, driven by overcapacities in the countries of origin. This causes a high number of potentials and challenges at the same time. Newly built cement plants can operate directly at best technological state of the art and thus incorporate more sustainable technologies as well as produce new and more sustainable products such as cements blended with sustainable supplementary cementitious materials such as calcined clays, and industrial or agricultural by products. At the same time the new variety of binding agent as well as the international imports, which are driven by price considerations, make the cement market prone to quality scatter. This puts pressure on the quality control regulations and institutions to ensure safety of construction, healthy application, and environmental safety for the population. The paper presents possible solutions to build up the rapidly increasing African cement production more sustainably than in the rest of the world as well as the related challenges and obstacles that need to be overcome. Based on experiences with a series of pan-African cement testing laboratory proficiency schemes conclusions are made on technical, regulative and political level.

Abstract.The African cement, concrete and construction business is growing at rapid pace. The cement sales are expected to grow rapidly until 2050. The number of newly built cement plants increases dramatically and in addition more cements are being imported from outside the continent, e.g. from Turkey, Pakistan, Indonesia, and China, driven by overcapacities in the countries of origin. This causes a high number of potentials and challenges at the same time. Newly built cement plants can operate directly at best technological state of the art and thus incorporate more sustainable technologies as well as produce new and more sustainable products such as cements blended with sustainable supplementary cementitious materials such as calcined clays, and industrial or agricultural by products. At the same time the new variety of binding agent as well as the international imports, which are driven by price considerations, make the cement market prone to quality scatter. This puts pressure on the quality control regulations and institutions to ensure safety of construction, healthy application, and environmental safety for the population. The paper presents possible solutions to build up the rapidly increasing African cement production more sustainably than in the rest of the world as well as the related challenges and obstacles that need to be overcome. Based on experiences with a series of panAfrican cement testing laboratory proficiency schemes conclusions are made on technical, regulative and political level.

Ensuring the safety of buildings and other construction works is a major public concern. This article gives an overview of the mechanisms and structures put in place in Europe, and more specifically Germany, to ensure safety in construction. The article identifies major risk factors and shows how the European and German governmental and private systems respond to these risks. The questions addressed include: How do regulators ensure the use of safe construction products and designs, and how is the execution of construction works monitored?

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